diff --git a/lib/jasmine-core/jasmine.js b/lib/jasmine-core/jasmine.js
index 3577abe5..56ec0572 100644
--- a/lib/jasmine-core/jasmine.js
+++ b/lib/jasmine-core/jasmine.js
@@ -76,6 +76,9 @@ var getJasmineRequireObj = (function (jasmineGlobal) {
     j$.TreeProcessor = jRequire.TreeProcessor();
     j$.version = jRequire.version();
     j$.Order = jRequire.Order();
+    j$.DiffBuilder = jRequire.DiffBuilder(j$);
+    j$.NullDiffBuilder = jRequire.NullDiffBuilder(j$);
+    j$.ObjectPath = jRequire.ObjectPath(j$);
 
     j$.matchers = jRequire.requireMatchers(jRequire, j$);
 
@@ -309,6 +312,22 @@ getJasmineRequireObj().util = function() {
     return descriptor;
   };
 
+  util.objectDifference = function(obj, toRemove) {
+    var diff = {};
+
+    for (var key in obj) {
+      if (util.has(obj, key) && !util.has(toRemove, key)) {
+        diff[key] = obj[key];
+      }
+    }
+
+    return diff;
+  };
+
+  util.has = function(obj, key) {
+    return Object.prototype.hasOwnProperty.call(obj, key);
+  };
+
   return util;
 };
 
@@ -1110,6 +1129,161 @@ getJasmineRequireObj().JsApiReporter = function() {
   return JsApiReporter;
 };
 
+getJasmineRequireObj().Any = function(j$) {
+
+  function Any(expectedObject) {
+    if (typeof expectedObject === 'undefined') {
+      throw new TypeError(
+        'jasmine.any() expects to be passed a constructor function. ' +
+        'Please pass one or use jasmine.anything() to match any object.'
+      );
+    }
+    this.expectedObject = expectedObject;
+  }
+
+  Any.prototype.asymmetricMatch = function(other) {
+    if (this.expectedObject == String) {
+      return typeof other == 'string' || other instanceof String;
+    }
+
+    if (this.expectedObject == Number) {
+      return typeof other == 'number' || other instanceof Number;
+    }
+
+    if (this.expectedObject == Function) {
+      return typeof other == 'function' || other instanceof Function;
+    }
+
+    if (this.expectedObject == Object) {
+      return typeof other == 'object';
+    }
+
+    if (this.expectedObject == Boolean) {
+      return typeof other == 'boolean';
+    }
+
+    return other instanceof this.expectedObject;
+  };
+
+  Any.prototype.jasmineToString = function() {
+    return '<jasmine.any(' + j$.fnNameFor(this.expectedObject) + ')>';
+  };
+
+  return Any;
+};
+
+getJasmineRequireObj().Anything = function(j$) {
+
+  function Anything() {}
+
+  Anything.prototype.asymmetricMatch = function(other) {
+    return !j$.util.isUndefined(other) && other !== null;
+  };
+
+  Anything.prototype.jasmineToString = function() {
+    return '<jasmine.anything>';
+  };
+
+  return Anything;
+};
+
+getJasmineRequireObj().ArrayContaining = function(j$) {
+  function ArrayContaining(sample) {
+    this.sample = sample;
+  }
+
+  ArrayContaining.prototype.asymmetricMatch = function(other, customTesters) {
+    var className = Object.prototype.toString.call(this.sample);
+    if (className !== '[object Array]') { throw new Error('You must provide an array to arrayContaining, not \'' + this.sample + '\'.'); }
+
+    for (var i = 0; i < this.sample.length; i++) {
+      var item = this.sample[i];
+      if (!j$.matchersUtil.contains(other, item, customTesters)) {
+        return false;
+      }
+    }
+
+    return true;
+  };
+
+  ArrayContaining.prototype.jasmineToString = function () {
+    return '<jasmine.arrayContaining(' + jasmine.pp(this.sample) +')>';
+  };
+
+  return ArrayContaining;
+};
+
+getJasmineRequireObj().ObjectContaining = function(j$) {
+
+  function ObjectContaining(sample) {
+    this.sample = sample;
+  }
+
+  function getPrototype(obj) {
+    if (Object.getPrototypeOf) {
+      return Object.getPrototypeOf(obj);
+    }
+
+    if (obj.constructor.prototype == obj) {
+      return null;
+    }
+
+    return obj.constructor.prototype;
+  }
+
+  function hasProperty(obj, property) {
+    if (!obj) {
+      return false;
+    }
+
+    if (Object.prototype.hasOwnProperty.call(obj, property)) {
+      return true;
+    }
+
+    return hasProperty(getPrototype(obj), property);
+  }
+
+  ObjectContaining.prototype.asymmetricMatch = function(other, customTesters) {
+    if (typeof(this.sample) !== 'object') { throw new Error('You must provide an object to objectContaining, not \''+this.sample+'\'.'); }
+
+    for (var property in this.sample) {
+      if (!hasProperty(other, property) ||
+          !j$.matchersUtil.equals(this.sample[property], other[property], customTesters)) {
+        return false;
+      }
+    }
+
+    return true;
+  };
+
+  ObjectContaining.prototype.jasmineToString = function() {
+    return '<jasmine.objectContaining(' + j$.pp(this.sample) + ')>';
+  };
+
+  return ObjectContaining;
+};
+
+getJasmineRequireObj().StringMatching = function(j$) {
+
+  function StringMatching(expected) {
+    if (!j$.isString_(expected) && !j$.isA_('RegExp', expected)) {
+      throw new Error('Expected is not a String or a RegExp');
+    }
+
+    this.regexp = new RegExp(expected);
+  }
+
+  StringMatching.prototype.asymmetricMatch = function(other) {
+    return this.regexp.test(other);
+  };
+
+  StringMatching.prototype.jasmineToString = function() {
+    return '<jasmine.stringMatching(' + this.regexp + ')>';
+  };
+
+  return StringMatching;
+};
+
 getJasmineRequireObj().CallTracker = function(j$) {
 
   function CallTracker() {
@@ -1513,6 +1687,16 @@ getJasmineRequireObj().DelayedFunctionScheduler = function() {
   return DelayedFunctionScheduler;
 };
 
+getJasmineRequireObj().errors = function() {
+  function ExpectationFailed() {}
+
+  ExpectationFailed.prototype = new Error();
+  ExpectationFailed.prototype.constructor = ExpectationFailed;
+
+  return {
+    ExpectationFailed: ExpectationFailed
+  };
+};
 getJasmineRequireObj().ExceptionFormatter = function() {
   function ExceptionFormatter() {
     this.message = function(error) {
@@ -1688,6 +1872,1030 @@ getJasmineRequireObj().buildExpectationResult = function() {
   return buildExpectationResult;
 };
 
+getJasmineRequireObj().formatErrorMsg = function() {
+  function generateErrorMsg(domain, usage) {
+    var usageDefinition = usage ? '\nUsage: ' + usage : '';
+
+    return function errorMsg(msg) {
+      return domain + ' : ' + msg + usageDefinition;
+    };
+  }
+
+  return generateErrorMsg;
+};
+
+getJasmineRequireObj().DiffBuilder = function(j$) {
+  return function DiffBuilder() {
+    var path = new j$.ObjectPath(),
+        mismatches = [];
+
+    return {
+      record: function (actual, expected, formatter) {
+        formatter = formatter || defaultFormatter;
+        mismatches.push(formatter(actual, expected, path));
+      },
+
+      getMessage: function () {
+        return mismatches.join('\n');
+      },
+
+      withPath: function (pathComponent, block) {
+        var oldPath = path;
+        path = path.add(pathComponent);
+        block();
+        path = oldPath;
+      }
+    };
+
+    function defaultFormatter (actual, expected, path) {
+      return 'Expected ' +
+        path + (path.depth() ? ' = ' : '') +
+        j$.pp(actual) +
+        ' to equal ' +
+        j$.pp(expected) +
+        '.';
+    }
+  };
+};
+
+getJasmineRequireObj().matchersUtil = function(j$) {
+  // TODO: what to do about jasmine.pp not being inject? move to JSON.stringify? gut PrettyPrinter?
+
+  return {
+    equals: equals,
+
+    contains: function(haystack, needle, customTesters) {
+      customTesters = customTesters || [];
+
+      if ((Object.prototype.toString.apply(haystack) === '[object Set]')) {
+        return haystack.has(needle);
+      }
+
+      if ((Object.prototype.toString.apply(haystack) === '[object Array]') ||
+        (!!haystack && !haystack.indexOf))
+      {
+        for (var i = 0; i < haystack.length; i++) {
+          if (equals(haystack[i], needle, customTesters)) {
+            return true;
+          }
+        }
+        return false;
+      }
+
+      return !!haystack && haystack.indexOf(needle) >= 0;
+    },
+
+    buildFailureMessage: function() {
+      var args = Array.prototype.slice.call(arguments, 0),
+        matcherName = args[0],
+        isNot = args[1],
+        actual = args[2],
+        expected = args.slice(3),
+        englishyPredicate = matcherName.replace(/[A-Z]/g, function(s) { return ' ' + s.toLowerCase(); });
+
+      var message = 'Expected ' +
+        j$.pp(actual) +
+        (isNot ? ' not ' : ' ') +
+        englishyPredicate;
+
+      if (expected.length > 0) {
+        for (var i = 0; i < expected.length; i++) {
+          if (i > 0) {
+            message += ',';
+          }
+          message += ' ' + j$.pp(expected[i]);
+        }
+      }
+
+      return message + '.';
+    }
+  };
+
+  function isAsymmetric(obj) {
+    return obj && j$.isA_('Function', obj.asymmetricMatch);
+  }
+
+  function asymmetricMatch(a, b, customTesters, diffBuilder) {
+    var asymmetricA = isAsymmetric(a),
+        asymmetricB = isAsymmetric(b),
+        result;
+
+    if (asymmetricA && asymmetricB) {
+      return undefined;
+    }
+
+    if (asymmetricA) {
+      result = a.asymmetricMatch(b, customTesters);
+      diffBuilder.record(a, b);
+      return result;
+    }
+
+    if (asymmetricB) {
+      result = b.asymmetricMatch(a, customTesters);
+      diffBuilder.record(a, b);
+      return result;
+    }
+  }
+
+  function equals(a, b, customTesters, diffBuilder) {
+    customTesters = customTesters || [];
+    diffBuilder = diffBuilder || j$.NullDiffBuilder();
+
+    return eq(a, b, [], [], customTesters, diffBuilder);
+  }
+
+  // Equality function lovingly adapted from isEqual in
+  //   [Underscore](http://underscorejs.org)
+  function eq(a, b, aStack, bStack, customTesters, diffBuilder) {
+    var result = true, i;
+
+    var asymmetricResult = asymmetricMatch(a, b, customTesters, diffBuilder);
+    if (!j$.util.isUndefined(asymmetricResult)) {
+      return asymmetricResult;
+    }
+
+    for (i = 0; i < customTesters.length; i++) {
+      var customTesterResult = customTesters[i](a, b);
+      if (!j$.util.isUndefined(customTesterResult)) {
+        if (!customTesterResult) {
+          diffBuilder.record(a, b);
+        }
+        return customTesterResult;
+      }
+    }
+
+    if (a instanceof Error && b instanceof Error) {
+      result = a.message == b.message;
+      if (!result) {
+        diffBuilder.record(a, b);
+      }
+      return result;
+    }
+
+    // Identical objects are equal. `0 === -0`, but they aren't identical.
+    // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
+    if (a === b) {
+      result = a !== 0 || 1 / a == 1 / b;
+      if (!result) {
+        diffBuilder.record(a, b);
+      }
+      return result;
+    }
+    // A strict comparison is necessary because `null == undefined`.
+    if (a === null || b === null) {
+      result = a === b;
+      if (!result) {
+        diffBuilder.record(a, b);
+      }
+      return result;
+    }
+    var className = Object.prototype.toString.call(a);
+    if (className != Object.prototype.toString.call(b)) {
+      diffBuilder.record(a, b);
+      return false;
+    }
+    switch (className) {
+      // Strings, numbers, dates, and booleans are compared by value.
+      case '[object String]':
+        // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
+        // equivalent to `new String("5")`.
+        result = a == String(b);
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
+      case '[object Number]':
+        // `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
+        // other numeric values.
+        result = a != +a ? b != +b : (a === 0 ? 1 / a == 1 / b : a == +b);
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
+      case '[object Date]':
+      case '[object Boolean]':
+        // Coerce dates and booleans to numeric primitive values. Dates are compared by their
+        // millisecond representations. Note that invalid dates with millisecond representations
+        // of `NaN` are not equivalent.
+        result = +a == +b;
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
+      // RegExps are compared by their source patterns and flags.
+      case '[object RegExp]':
+        return a.source == b.source &&
+          a.global == b.global &&
+          a.multiline == b.multiline &&
+          a.ignoreCase == b.ignoreCase;
+    }
+    if (typeof a != 'object' || typeof b != 'object') {
+      diffBuilder.record(a, b);
+      return false;
+    }
+
+    var aIsDomNode = j$.isDomNode(a);
+    var bIsDomNode = j$.isDomNode(b);
+    if (aIsDomNode && bIsDomNode) {
+      // At first try to use DOM3 method isEqualNode
+      if (a.isEqualNode) {
+        result = a.isEqualNode(b);
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
+      }
+      // IE8 doesn't support isEqualNode, try to use outerHTML && innerText
+      var aIsElement = a instanceof Element;
+      var bIsElement = b instanceof Element;
+      if (aIsElement && bIsElement) {
+        return a.outerHTML == b.outerHTML;
+      }
+      if (aIsElement || bIsElement) {
+        return false;
+      }
+      return a.innerText == b.innerText && a.textContent == b.textContent;
+    }
+    if (aIsDomNode || bIsDomNode) {
+      return false;
+    }
+
+    // Assume equality for cyclic structures. The algorithm for detecting cyclic
+    // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
+    var length = aStack.length;
+    while (length--) {
+      // Linear search. Performance is inversely proportional to the number of
+      // unique nested structures.
+      if (aStack[length] == a) { return bStack[length] == b; }
+    }
+    // Add the first object to the stack of traversed objects.
+    aStack.push(a);
+    bStack.push(b);
+    var size = 0;
+    // Recursively compare objects and arrays.
+    // Compare array lengths to determine if a deep comparison is necessary.
+    if (className == '[object Array]') {
+      size = a.length;
+      if (size !== b.length) {
+        diffBuilder.record(a, b);
+        return false;
+      }
+
+      for (i = 0; i < size; i++) {
+        diffBuilder.withPath(i, function() {
+          result = eq(a[i], b[i], aStack, bStack, customTesters, diffBuilder) && result;
+        });
+      }
+      if (!result) {
+        return false;
+      }
+    } else if (className == '[object Set]') {
+      if (a.size != b.size) {
+        diffBuilder.record(a, b);
+        return false;
+      }
+      var iterA = a.values(), iterB = b.values();
+      var valA, valB;
+      do {
+        valA = iterA.next();
+        valB = iterB.next();
+        if (!eq(valA.value, valB.value, aStack, bStack, customTesters, j$.NullDiffBuilder())) {
+          diffBuilder.record(a, b);
+          return false;
+        }
+      } while (!valA.done && !valB.done);
+    } else {
+
+      // Objects with different constructors are not equivalent, but `Object`s
+      // or `Array`s from different frames are.
+      var aCtor = a.constructor, bCtor = b.constructor;
+      if (aCtor !== bCtor &&
+          isFunction(aCtor) && isFunction(bCtor) &&
+          a instanceof aCtor && b instanceof bCtor &&
+          !(aCtor instanceof aCtor && bCtor instanceof bCtor)) {
+
+        diffBuilder.record(a, b, constructorsAreDifferentFormatter);
+        return false;
+      }
+    }
+
+    // Deep compare objects.
+    var aKeys = keys(a, className == '[object Array]'), key;
+    size = aKeys.length;
+
+    // Ensure that both objects contain the same number of properties before comparing deep equality.
+    if (keys(b, className == '[object Array]').length !== size) {
+      diffBuilder.record(a, b, objectKeysAreDifferentFormatter);
+      return false;
+    }
+
+    for (i = 0; i < size; i++) {
+      key = aKeys[i];
+      // Deep compare each member
+      if (!j$.util.has(b, key)) {
+        diffBuilder.record(a, b, objectKeysAreDifferentFormatter);
+        result = false;
+        continue;
+      }
+
+      diffBuilder.withPath(key, function() {
+        if(!eq(a[key], b[key], aStack, bStack, customTesters, diffBuilder)) {
+          result = false;
+        }
+      });
+    }
+
+    if (!result) {
+      return false;
+    }
+
+    // Remove the first object from the stack of traversed objects.
+    aStack.pop();
+    bStack.pop();
+
+    return result;
+  }
+
+  function keys(obj, isArray) {
+    var allKeys = Object.keys ? Object.keys(obj) :
+      (function(o) {
+          var keys = [];
+          for (var key in o) {
+              if (j$.util.has(o, key)) {
+                  keys.push(key);
+              }
+          }
+          return keys;
+      })(obj);
+
+    if (!isArray) {
+      return allKeys;
+    }
+
+    if (allKeys.length === 0) {
+        return allKeys;
+    }
+
+    var extraKeys = [];
+    for (var i in allKeys) {
+      if (!allKeys[i].match(/^[0-9]+$/)) {
+        extraKeys.push(allKeys[i]);
+      }
+    }
+
+    return extraKeys;
+  }
+
+  function has(obj, key) {
+    return Object.prototype.hasOwnProperty.call(obj, key);
+  }
+
+  function isFunction(obj) {
+    return typeof obj === 'function';
+  }
+
+  function objectKeysAreDifferentFormatter(actual, expected, path) {
+    var missingProperties = j$.util.objectDifference(expected, actual),
+        extraProperties = j$.util.objectDifference(actual, expected),
+        missingPropertiesMessage = formatKeyValuePairs(missingProperties),
+        extraPropertiesMessage = formatKeyValuePairs(extraProperties),
+        messages = [];
+
+    if (!path.depth()) {
+      path = 'object';
+    }
+
+    if (missingPropertiesMessage.length) {
+      messages.push('Expected ' + path + ' to have properties' + missingPropertiesMessage);
+    }
+
+    if (extraPropertiesMessage.length) {
+      messages.push('Expected ' + path + ' not to have properties' + extraPropertiesMessage);
+    }
+
+    return messages.join('\n');
+  }
+
+  function constructorsAreDifferentFormatter(actual, expected, path) {
+    if (!path.depth()) {
+      path = 'object';
+    }
+
+    return 'Expected ' +
+      path + ' to be a kind of ' +
+      expected.constructor.name +
+      ', but was ' + j$.pp(actual) + '.';
+  }
+
+  function formatKeyValuePairs(obj) {
+    var formatted = '';
+    for (var key in obj) {
+      formatted += '\n    ' + key + ': ' + j$.pp(obj[key]);
+    }
+    return formatted;
+  }
+};
+
+getJasmineRequireObj().NullDiffBuilder = function(j$) {
+  return function() {
+    return {
+      withPath: function(_, block) {
+        block();
+      },
+      record: function() {}
+    };
+  };
+};
+
+getJasmineRequireObj().ObjectPath = function(j$) {
+  function ObjectPath(components) {
+    this.components = components || [];
+  }
+
+  ObjectPath.prototype.toString = function() {
+    if (this.components.length) {
+      return '$' + map(this.components, formatPropertyAccess).join('');
+    } else {
+      return '';
+    }
+  };
+
+  ObjectPath.prototype.add = function(component) {
+    return new ObjectPath(this.components.concat([component]));
+  };
+
+  ObjectPath.prototype.depth = function() {
+    return this.components.length;
+  };
+
+  function formatPropertyAccess(prop) {
+    if (typeof prop === 'number') {
+      return '[' + prop + ']';
+    }
+
+    if (isValidIdentifier(prop)) {
+      return '.' + prop;
+    }
+
+    return '[\'' + prop + '\']';
+  }
+
+  function map(array, fn) {
+    var results = [];
+    for (var i = 0; i < array.length; i++) {
+      results.push(fn(array[i]));
+    }
+    return results;
+  }
+
+  function isValidIdentifier(string) {
+    return /^[A-Za-z\$_][A-Za-z0-9\$_]*$/.test(string);
+  }
+
+  return ObjectPath;
+};
+
+getJasmineRequireObj().toBe = function() {
+  function toBe() {
+    return {
+      compare: function(actual, expected) {
+        return {
+          pass: actual === expected
+        };
+      }
+    };
+  }
+
+  return toBe;
+};
+
+getJasmineRequireObj().toBeCloseTo = function() {
+
+  function toBeCloseTo() {
+    return {
+      compare: function(actual, expected, precision) {
+        if (precision !== 0) {
+          precision = precision || 2;
+        }
+
+        return {
+          pass: Math.abs(expected - actual) < (Math.pow(10, -precision) / 2)
+        };
+      }
+    };
+  }
+
+  return toBeCloseTo;
+};
+
+getJasmineRequireObj().toBeDefined = function() {
+  function toBeDefined() {
+    return {
+      compare: function(actual) {
+        return {
+          pass: (void 0 !== actual)
+        };
+      }
+    };
+  }
+
+  return toBeDefined;
+};
+
+getJasmineRequireObj().toBeFalsy = function() {
+  function toBeFalsy() {
+    return {
+      compare: function(actual) {
+        return {
+          pass: !!!actual
+        };
+      }
+    };
+  }
+
+  return toBeFalsy;
+};
+
+getJasmineRequireObj().toBeGreaterThan = function() {
+
+  function toBeGreaterThan() {
+    return {
+      compare: function(actual, expected) {
+        return {
+          pass: actual > expected
+        };
+      }
+    };
+  }
+
+  return toBeGreaterThan;
+};
+
+
+getJasmineRequireObj().toBeGreaterThanOrEqual = function() {
+
+  function toBeGreaterThanOrEqual() {
+    return {
+      compare: function(actual, expected) {
+        return {
+          pass: actual >= expected
+        };
+      }
+    };
+  }
+
+  return toBeGreaterThanOrEqual;
+};
+
+getJasmineRequireObj().toBeLessThan = function() {
+  function toBeLessThan() {
+    return {
+
+      compare: function(actual, expected) {
+        return {
+          pass: actual < expected
+        };
+      }
+    };
+  }
+
+  return toBeLessThan;
+};
+getJasmineRequireObj().toBeLessThanOrEqual = function() {
+  function toBeLessThanOrEqual() {
+    return {
+
+      compare: function(actual, expected) {
+        return {
+          pass: actual <= expected
+        };
+      }
+    };
+  }
+
+  return toBeLessThanOrEqual;
+};
+
+getJasmineRequireObj().toBeNaN = function(j$) {
+
+  function toBeNaN() {
+    return {
+      compare: function(actual) {
+        var result = {
+          pass: (actual !== actual)
+        };
+
+        if (result.pass) {
+          result.message = 'Expected actual not to be NaN.';
+        } else {
+          result.message = function() { return 'Expected ' + j$.pp(actual) + ' to be NaN.'; };
+        }
+
+        return result;
+      }
+    };
+  }
+
+  return toBeNaN;
+};
+
+getJasmineRequireObj().toBeNull = function() {
+
+  function toBeNull() {
+    return {
+      compare: function(actual) {
+        return {
+          pass: actual === null
+        };
+      }
+    };
+  }
+
+  return toBeNull;
+};
+
+getJasmineRequireObj().toBeTruthy = function() {
+
+  function toBeTruthy() {
+    return {
+      compare: function(actual) {
+        return {
+          pass: !!actual
+        };
+      }
+    };
+  }
+
+  return toBeTruthy;
+};
+
+getJasmineRequireObj().toBeUndefined = function() {
+
+  function toBeUndefined() {
+    return {
+      compare: function(actual) {
+        return {
+          pass: void 0 === actual
+        };
+      }
+    };
+  }
+
+  return toBeUndefined;
+};
+
+getJasmineRequireObj().toContain = function() {
+  function toContain(util, customEqualityTesters) {
+    customEqualityTesters = customEqualityTesters || [];
+
+    return {
+      compare: function(actual, expected) {
+
+        return {
+          pass: util.contains(actual, expected, customEqualityTesters)
+        };
+      }
+    };
+  }
+
+  return toContain;
+};
+
+getJasmineRequireObj().toEqual = function(j$) {
+
+  function toEqual(util, customEqualityTesters) {
+    customEqualityTesters = customEqualityTesters || [];
+
+    return {
+      compare: function(actual, expected) {
+        var result = {
+            pass: false
+          },
+          diffBuilder = j$.DiffBuilder();
+
+        result.pass = util.equals(actual, expected, customEqualityTesters, diffBuilder);
+
+        // TODO: only set error message if test fails
+        result.message = diffBuilder.getMessage();
+
+        return result;
+      }
+    };
+  }
+
+  return toEqual;
+};
+
+getJasmineRequireObj().toHaveBeenCalled = function(j$) {
+
+  var getErrorMsg = j$.formatErrorMsg('<toHaveBeenCalled>', 'expect(<spyObj>).toHaveBeenCalled()');
+
+  function toHaveBeenCalled() {
+    return {
+      compare: function(actual) {
+        var result = {};
+
+        if (!j$.isSpy(actual)) {
+          throw new Error(getErrorMsg('Expected a spy, but got ' + j$.pp(actual) + '.'));
+        }
+
+        if (arguments.length > 1) {
+          throw new Error(getErrorMsg('Does not take arguments, use toHaveBeenCalledWith'));
+        }
+
+        result.pass = actual.calls.any();
+
+        result.message = result.pass ?
+          'Expected spy ' + actual.and.identity() + ' not to have been called.' :
+          'Expected spy ' + actual.and.identity() + ' to have been called.';
+
+        return result;
+      }
+    };
+  }
+
+  return toHaveBeenCalled;
+};
+
+getJasmineRequireObj().toHaveBeenCalledTimes = function(j$) {
+
+  var getErrorMsg = j$.formatErrorMsg('<toHaveBeenCalledTimes>', 'expect(<spyObj>).toHaveBeenCalledTimes(<Number>)');
+
+  function toHaveBeenCalledTimes() {
+    return {
+      compare: function(actual, expected) {
+        if (!j$.isSpy(actual)) {
+          throw new Error(getErrorMsg('Expected a spy, but got ' + j$.pp(actual) + '.'));
+        }
+
+        var args = Array.prototype.slice.call(arguments, 0),
+          result = { pass: false };
+
+        if (!j$.isNumber_(expected)){
+          throw new Error(getErrorMsg('The expected times failed is a required argument and must be a number.'));
+        }
+
+        actual = args[0];
+        var calls = actual.calls.count();
+        var timesMessage = expected === 1 ? 'once' : expected + ' times';
+        result.pass = calls === expected;
+        result.message = result.pass ?
+          'Expected spy ' + actual.and.identity() + ' not to have been called ' + timesMessage + '. It was called ' +  calls + ' times.' :
+          'Expected spy ' + actual.and.identity() + ' to have been called ' + timesMessage + '. It was called ' +  calls + ' times.';
+        return result;
+      }
+    };
+  }
+
+  return toHaveBeenCalledTimes;
+};
+
+getJasmineRequireObj().toHaveBeenCalledWith = function(j$) {
+
+  var getErrorMsg = j$.formatErrorMsg('<toHaveBeenCalledWith>', 'expect(<spyObj>).toHaveBeenCalledWith(...arguments)');
+
+  function toHaveBeenCalledWith(util, customEqualityTesters) {
+    return {
+      compare: function() {
+        var args = Array.prototype.slice.call(arguments, 0),
+          actual = args[0],
+          expectedArgs = args.slice(1),
+          result = { pass: false };
+
+        if (!j$.isSpy(actual)) {
+          throw new Error(getErrorMsg('Expected a spy, but got ' + j$.pp(actual) + '.'));
+        }
+
+        if (!actual.calls.any()) {
+          result.message = function() { return 'Expected spy ' + actual.and.identity() + ' to have been called with ' + j$.pp(expectedArgs) + ' but it was never called.'; };
+          return result;
+        }
+
+        if (util.contains(actual.calls.allArgs(), expectedArgs, customEqualityTesters)) {
+          result.pass = true;
+          result.message = function() { return 'Expected spy ' + actual.and.identity() + ' not to have been called with ' + j$.pp(expectedArgs) + ' but it was.'; };
+        } else {
+          result.message = function() { return 'Expected spy ' + actual.and.identity() + ' to have been called with ' + j$.pp(expectedArgs) + ' but actual calls were ' + j$.pp(actual.calls.allArgs()).replace(/^\[ | \]$/g, '') + '.'; };
+        }
+
+        return result;
+      }
+    };
+  }
+
+  return toHaveBeenCalledWith;
+};
+
+getJasmineRequireObj().toMatch = function(j$) {
+
+  var getErrorMsg = j$.formatErrorMsg('<toMatch>', 'expect(<expectation>).toMatch(<string> || <regexp>)');
+
+  function toMatch() {
+    return {
+      compare: function(actual, expected) {
+        if (!j$.isString_(expected) && !j$.isA_('RegExp', expected)) {
+          throw new Error(getErrorMsg('Expected is not a String or a RegExp'));
+        }
+
+        var regexp = new RegExp(expected);
+
+        return {
+          pass: regexp.test(actual)
+        };
+      }
+    };
+  }
+
+  return toMatch;
+};
+
+getJasmineRequireObj().toThrow = function(j$) {
+
+  var getErrorMsg = j$.formatErrorMsg('<toThrow>', 'expect(function() {<expectation>}).toThrow()');
+
+  function toThrow(util) {
+    return {
+      compare: function(actual, expected) {
+        var result = { pass: false },
+          threw = false,
+          thrown;
+
+        if (typeof actual != 'function') {
+          throw new Error(getErrorMsg('Actual is not a Function'));
+        }
+
+        try {
+          actual();
+        } catch (e) {
+          threw = true;
+          thrown = e;
+        }
+
+        if (!threw) {
+          result.message = 'Expected function to throw an exception.';
+          return result;
+        }
+
+        if (arguments.length == 1) {
+          result.pass = true;
+          result.message = function() { return 'Expected function not to throw, but it threw ' + j$.pp(thrown) + '.'; };
+
+          return result;
+        }
+
+        if (util.equals(thrown, expected)) {
+          result.pass = true;
+          result.message = function() { return 'Expected function not to throw ' + j$.pp(expected) + '.'; };
+        } else {
+          result.message = function() { return 'Expected function to throw ' + j$.pp(expected) + ', but it threw ' +  j$.pp(thrown) + '.'; };
+        }
+
+        return result;
+      }
+    };
+  }
+
+  return toThrow;
+};
+
+getJasmineRequireObj().toThrowError = function(j$) {
+
+  var getErrorMsg =  j$.formatErrorMsg('<toThrowError>', 'expect(function() {<expectation>}).toThrowError(<ErrorConstructor>, <message>)');
+
+  function toThrowError () {
+    return {
+      compare: function(actual) {
+        var threw = false,
+          pass = {pass: true},
+          fail = {pass: false},
+          thrown;
+
+        if (typeof actual != 'function') {
+          throw new Error(getErrorMsg('Actual is not a Function'));
+        }
+
+        var errorMatcher = getMatcher.apply(null, arguments);
+
+        try {
+          actual();
+        } catch (e) {
+          threw = true;
+          thrown = e;
+        }
+
+        if (!threw) {
+          fail.message = 'Expected function to throw an Error.';
+          return fail;
+        }
+
+        if (!(thrown instanceof Error)) {
+          fail.message = function() { return 'Expected function to throw an Error, but it threw ' + j$.pp(thrown) + '.'; };
+          return fail;
+        }
+
+        if (errorMatcher.hasNoSpecifics()) {
+          pass.message = 'Expected function not to throw an Error, but it threw ' + j$.fnNameFor(thrown) + '.';
+          return pass;
+        }
+
+        if (errorMatcher.matches(thrown)) {
+          pass.message = function() {
+            return 'Expected function not to throw ' + errorMatcher.errorTypeDescription + errorMatcher.messageDescription() + '.';
+          };
+          return pass;
+        } else {
+          fail.message = function() {
+            return 'Expected function to throw ' + errorMatcher.errorTypeDescription + errorMatcher.messageDescription() +
+              ', but it threw ' + errorMatcher.thrownDescription(thrown) + '.';
+          };
+          return fail;
+        }
+      }
+    };
+
+    function getMatcher() {
+      var expected = null,
+          errorType = null;
+
+      if (arguments.length == 2) {
+        expected = arguments[1];
+        if (isAnErrorType(expected)) {
+          errorType = expected;
+          expected = null;
+        }
+      } else if (arguments.length > 2) {
+        errorType = arguments[1];
+        expected = arguments[2];
+        if (!isAnErrorType(errorType)) {
+          throw new Error(getErrorMsg('Expected error type is not an Error.'));
+        }
+      }
+
+      if (expected && !isStringOrRegExp(expected)) {
+        if (errorType) {
+          throw new Error(getErrorMsg('Expected error message is not a string or RegExp.'));
+        } else {
+          throw new Error(getErrorMsg('Expected is not an Error, string, or RegExp.'));
+        }
+      }
+
+      function messageMatch(message) {
+        if (typeof expected == 'string') {
+          return expected == message;
+        } else {
+          return expected.test(message);
+        }
+      }
+
+      return {
+        errorTypeDescription: errorType ? j$.fnNameFor(errorType) : 'an exception',
+        thrownDescription: function(thrown) {
+          var thrownName = errorType ? j$.fnNameFor(thrown.constructor) : 'an exception',
+              thrownMessage = '';
+
+          if (expected) {
+            thrownMessage = ' with message ' + j$.pp(thrown.message);
+          }
+
+          return thrownName + thrownMessage;
+        },
+        messageDescription: function() {
+          if (expected === null) {
+            return '';
+          } else if (expected instanceof RegExp) {
+            return ' with a message matching ' + j$.pp(expected);
+          } else {
+            return ' with message ' + j$.pp(expected);
+          }
+        },
+        hasNoSpecifics: function() {
+          return expected === null && errorType === null;
+        },
+        matches: function(error) {
+          return (errorType === null || error instanceof errorType) &&
+            (expected === null || messageMatch(error.message));
+        }
+      };
+    }
+
+    function isStringOrRegExp(potential) {
+      return potential instanceof RegExp || (typeof potential == 'string');
+    }
+
+    function isAnErrorType(type) {
+      if (typeof type !== 'function') {
+        return false;
+      }
+
+      var Surrogate = function() {};
+      Surrogate.prototype = type.prototype;
+      return (new Surrogate()) instanceof Error;
+    }
+  }
+
+  return toThrowError;
+};
+
 getJasmineRequireObj().MockDate = function() {
   function MockDate(global) {
     var self = this;
@@ -1918,7 +3126,13 @@ getJasmineRequireObj().pp = function(j$) {
   };
 
   StringPrettyPrinter.prototype.emitObject = function(obj) {
-    var constructorName = obj.constructor ? j$.fnNameFor(obj.constructor) : 'null';
+    var ctor = obj.constructor,
+        constructorName;
+
+    constructorName = typeof ctor === 'function' && obj instanceof ctor ?
+      j$.fnNameFor(obj.constructor) :
+      'null';
+
     this.append(constructorName);
 
     if (this.ppNestLevel_ > j$.MAX_PRETTY_PRINT_DEPTH) {
@@ -2113,6 +3327,90 @@ getJasmineRequireObj().ReportDispatcher = function() {
 };
 
 
+getJasmineRequireObj().interface = function(jasmine, env) {
+  var jasmineInterface = {
+    describe: function(description, specDefinitions) {
+      return env.describe(description, specDefinitions);
+    },
+
+    xdescribe: function(description, specDefinitions) {
+      return env.xdescribe(description, specDefinitions);
+    },
+
+    fdescribe: function(description, specDefinitions) {
+      return env.fdescribe(description, specDefinitions);
+    },
+
+    it: function() {
+      return env.it.apply(env, arguments);
+    },
+
+    xit: function() {
+      return env.xit.apply(env, arguments);
+    },
+
+    fit: function() {
+      return env.fit.apply(env, arguments);
+    },
+
+    beforeEach: function() {
+      return env.beforeEach.apply(env, arguments);
+    },
+
+    afterEach: function() {
+      return env.afterEach.apply(env, arguments);
+    },
+
+    beforeAll: function() {
+      return env.beforeAll.apply(env, arguments);
+    },
+
+    afterAll: function() {
+      return env.afterAll.apply(env, arguments);
+    },
+
+    expect: function(actual) {
+      return env.expect(actual);
+    },
+
+    pending: function() {
+      return env.pending.apply(env, arguments);
+    },
+
+    fail: function() {
+      return env.fail.apply(env, arguments);
+    },
+
+    spyOn: function(obj, methodName) {
+      return env.spyOn(obj, methodName);
+    },
+
+    spyOnProperty: function(obj, methodName, accessType) {
+      return env.spyOnProperty(obj, methodName, accessType);
+    },
+
+    jsApiReporter: new jasmine.JsApiReporter({
+      timer: new jasmine.Timer()
+    }),
+
+    jasmine: jasmine
+  };
+
+  jasmine.addCustomEqualityTester = function(tester) {
+    env.addCustomEqualityTester(tester);
+  };
+
+  jasmine.addMatchers = function(matchers) {
+    return env.addMatchers(matchers);
+  };
+
+  jasmine.clock = function() {
+    return env.clock;
+  };
+
+  return jasmineInterface;
+};
+
 getJasmineRequireObj().Spy = function (j$) {
 
   function Spy(name, originalFn) {
@@ -2784,1077 +4082,6 @@ getJasmineRequireObj().TreeProcessor = function() {
   return TreeProcessor;
 };
 
-getJasmineRequireObj().Any = function(j$) {
-
-  function Any(expectedObject) {
-    if (typeof expectedObject === 'undefined') {
-      throw new TypeError(
-        'jasmine.any() expects to be passed a constructor function. ' +
-        'Please pass one or use jasmine.anything() to match any object.'
-      );
-    }
-    this.expectedObject = expectedObject;
-  }
-
-  Any.prototype.asymmetricMatch = function(other) {
-    if (this.expectedObject == String) {
-      return typeof other == 'string' || other instanceof String;
-    }
-
-    if (this.expectedObject == Number) {
-      return typeof other == 'number' || other instanceof Number;
-    }
-
-    if (this.expectedObject == Function) {
-      return typeof other == 'function' || other instanceof Function;
-    }
-
-    if (this.expectedObject == Object) {
-      return typeof other == 'object';
-    }
-
-    if (this.expectedObject == Boolean) {
-      return typeof other == 'boolean';
-    }
-
-    return other instanceof this.expectedObject;
-  };
-
-  Any.prototype.jasmineToString = function() {
-    return '<jasmine.any(' + j$.fnNameFor(this.expectedObject) + ')>';
-  };
-
-  return Any;
-};
-
-getJasmineRequireObj().Anything = function(j$) {
-
-  function Anything() {}
-
-  Anything.prototype.asymmetricMatch = function(other) {
-    return !j$.util.isUndefined(other) && other !== null;
-  };
-
-  Anything.prototype.jasmineToString = function() {
-    return '<jasmine.anything>';
-  };
-
-  return Anything;
-};
-
-getJasmineRequireObj().ArrayContaining = function(j$) {
-  function ArrayContaining(sample) {
-    this.sample = sample;
-  }
-
-  ArrayContaining.prototype.asymmetricMatch = function(other, customTesters) {
-    var className = Object.prototype.toString.call(this.sample);
-    if (className !== '[object Array]') { throw new Error('You must provide an array to arrayContaining, not \'' + this.sample + '\'.'); }
-
-    for (var i = 0; i < this.sample.length; i++) {
-      var item = this.sample[i];
-      if (!j$.matchersUtil.contains(other, item, customTesters)) {
-        return false;
-      }
-    }
-
-    return true;
-  };
-
-  ArrayContaining.prototype.jasmineToString = function () {
-    return '<jasmine.arrayContaining(' + jasmine.pp(this.sample) +')>';
-  };
-
-  return ArrayContaining;
-};
-
-getJasmineRequireObj().ObjectContaining = function(j$) {
-
-  function ObjectContaining(sample) {
-    this.sample = sample;
-  }
-
-  function getPrototype(obj) {
-    if (Object.getPrototypeOf) {
-      return Object.getPrototypeOf(obj);
-    }
-
-    if (obj.constructor.prototype == obj) {
-      return null;
-    }
-
-    return obj.constructor.prototype;
-  }
-
-  function hasProperty(obj, property) {
-    if (!obj) {
-      return false;
-    }
-
-    if (Object.prototype.hasOwnProperty.call(obj, property)) {
-      return true;
-    }
-
-    return hasProperty(getPrototype(obj), property);
-  }
-
-  ObjectContaining.prototype.asymmetricMatch = function(other, customTesters) {
-    if (typeof(this.sample) !== 'object') { throw new Error('You must provide an object to objectContaining, not \''+this.sample+'\'.'); }
-
-    for (var property in this.sample) {
-      if (!hasProperty(other, property) ||
-          !j$.matchersUtil.equals(this.sample[property], other[property], customTesters)) {
-        return false;
-      }
-    }
-
-    return true;
-  };
-
-  ObjectContaining.prototype.jasmineToString = function() {
-    return '<jasmine.objectContaining(' + j$.pp(this.sample) + ')>';
-  };
-
-  return ObjectContaining;
-};
-
-getJasmineRequireObj().StringMatching = function(j$) {
-
-  function StringMatching(expected) {
-    if (!j$.isString_(expected) && !j$.isA_('RegExp', expected)) {
-      throw new Error('Expected is not a String or a RegExp');
-    }
-
-    this.regexp = new RegExp(expected);
-  }
-
-  StringMatching.prototype.asymmetricMatch = function(other) {
-    return this.regexp.test(other);
-  };
-
-  StringMatching.prototype.jasmineToString = function() {
-    return '<jasmine.stringMatching(' + this.regexp + ')>';
-  };
-
-  return StringMatching;
-};
-
-getJasmineRequireObj().errors = function() {
-  function ExpectationFailed() {}
-
-  ExpectationFailed.prototype = new Error();
-  ExpectationFailed.prototype.constructor = ExpectationFailed;
-
-  return {
-    ExpectationFailed: ExpectationFailed
-  };
-};
-getJasmineRequireObj().formatErrorMsg = function() {
-  function generateErrorMsg(domain, usage) {
-    var usageDefinition = usage ? '\nUsage: ' + usage : '';
-
-    return function errorMsg(msg) {
-      return domain + ' : ' + msg + usageDefinition;
-    };
-  }
-
-  return generateErrorMsg;
-};
-
-getJasmineRequireObj().matchersUtil = function(j$) {
-  // TODO: what to do about jasmine.pp not being inject? move to JSON.stringify? gut PrettyPrinter?
-
-  return {
-    equals: function(a, b, customTesters) {
-      customTesters = customTesters || [];
-
-      return eq(a, b, [], [], customTesters);
-    },
-
-    contains: function(haystack, needle, customTesters) {
-      customTesters = customTesters || [];
-
-      if ((Object.prototype.toString.apply(haystack) === '[object Set]')) {
-        return haystack.has(needle);
-      }
-
-      if ((Object.prototype.toString.apply(haystack) === '[object Array]') ||
-        (!!haystack && !haystack.indexOf))
-      {
-        for (var i = 0; i < haystack.length; i++) {
-          if (eq(haystack[i], needle, [], [], customTesters)) {
-            return true;
-          }
-        }
-        return false;
-      }
-
-      return !!haystack && haystack.indexOf(needle) >= 0;
-    },
-
-    buildFailureMessage: function() {
-      var args = Array.prototype.slice.call(arguments, 0),
-        matcherName = args[0],
-        isNot = args[1],
-        actual = args[2],
-        expected = args.slice(3),
-        englishyPredicate = matcherName.replace(/[A-Z]/g, function(s) { return ' ' + s.toLowerCase(); });
-
-      var message = 'Expected ' +
-        j$.pp(actual) +
-        (isNot ? ' not ' : ' ') +
-        englishyPredicate;
-
-      if (expected.length > 0) {
-        for (var i = 0; i < expected.length; i++) {
-          if (i > 0) {
-            message += ',';
-          }
-          message += ' ' + j$.pp(expected[i]);
-        }
-      }
-
-      return message + '.';
-    }
-  };
-
-  function isAsymmetric(obj) {
-    return obj && j$.isA_('Function', obj.asymmetricMatch);
-  }
-
-  function asymmetricMatch(a, b, customTesters) {
-    var asymmetricA = isAsymmetric(a),
-        asymmetricB = isAsymmetric(b);
-
-    if (asymmetricA && asymmetricB) {
-      return undefined;
-    }
-
-    if (asymmetricA) {
-      return a.asymmetricMatch(b, customTesters);
-    }
-
-    if (asymmetricB) {
-      return b.asymmetricMatch(a, customTesters);
-    }
-  }
-
-  // Equality function lovingly adapted from isEqual in
-  //   [Underscore](http://underscorejs.org)
-  function eq(a, b, aStack, bStack, customTesters) {
-    var result = true;
-
-    var asymmetricResult = asymmetricMatch(a, b, customTesters);
-    if (!j$.util.isUndefined(asymmetricResult)) {
-      return asymmetricResult;
-    }
-
-    for (var i = 0; i < customTesters.length; i++) {
-      var customTesterResult = customTesters[i](a, b);
-      if (!j$.util.isUndefined(customTesterResult)) {
-        return customTesterResult;
-      }
-    }
-
-    if (a instanceof Error && b instanceof Error) {
-      return a.message == b.message;
-    }
-
-    // Identical objects are equal. `0 === -0`, but they aren't identical.
-    // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
-    if (a === b) { return a !== 0 || 1 / a == 1 / b; }
-    // A strict comparison is necessary because `null == undefined`.
-    if (a === null || b === null) { return a === b; }
-    var className = Object.prototype.toString.call(a);
-    if (className != Object.prototype.toString.call(b)) { return false; }
-    switch (className) {
-      // Strings, numbers, dates, and booleans are compared by value.
-      case '[object String]':
-        // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
-        // equivalent to `new String("5")`.
-        return a == String(b);
-      case '[object Number]':
-        // `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
-        // other numeric values.
-        return a != +a ? b != +b : (a === 0 ? 1 / a == 1 / b : a == +b);
-      case '[object Date]':
-      case '[object Boolean]':
-        // Coerce dates and booleans to numeric primitive values. Dates are compared by their
-        // millisecond representations. Note that invalid dates with millisecond representations
-        // of `NaN` are not equivalent.
-        return +a == +b;
-      // RegExps are compared by their source patterns and flags.
-      case '[object RegExp]':
-        return a.source == b.source &&
-          a.global == b.global &&
-          a.multiline == b.multiline &&
-          a.ignoreCase == b.ignoreCase;
-    }
-    if (typeof a != 'object' || typeof b != 'object') { return false; }
-
-    var aIsDomNode = j$.isDomNode(a);
-    var bIsDomNode = j$.isDomNode(b);
-    if (aIsDomNode && bIsDomNode) {
-      // At first try to use DOM3 method isEqualNode
-      if (a.isEqualNode) {
-        return a.isEqualNode(b);
-      }
-      // IE8 doesn't support isEqualNode, try to use outerHTML && innerText
-      var aIsElement = a instanceof Element;
-      var bIsElement = b instanceof Element;
-      if (aIsElement && bIsElement) {
-        return a.outerHTML == b.outerHTML;
-      }
-      if (aIsElement || bIsElement) {
-        return false;
-      }
-      return a.innerText == b.innerText && a.textContent == b.textContent;
-    }
-    if (aIsDomNode || bIsDomNode) {
-      return false;
-    }
-
-    // Assume equality for cyclic structures. The algorithm for detecting cyclic
-    // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
-    var length = aStack.length;
-    while (length--) {
-      // Linear search. Performance is inversely proportional to the number of
-      // unique nested structures.
-      if (aStack[length] == a) { return bStack[length] == b; }
-    }
-    // Add the first object to the stack of traversed objects.
-    aStack.push(a);
-    bStack.push(b);
-    var size = 0;
-    // Recursively compare objects and arrays.
-    // Compare array lengths to determine if a deep comparison is necessary.
-    if (className == '[object Array]') {
-      size = a.length;
-      if (size !== b.length) {
-        return false;
-      }
-
-      while (size--) {
-        result = eq(a[size], b[size], aStack, bStack, customTesters);
-        if (!result) {
-          return false;
-        }
-      }
-    } else if (className == '[object Set]') {
-      if (a.size != b.size) {
-        return false;
-      }
-      var iterA = a.values(), iterB = b.values();
-      var valA, valB;
-      do {
-        valA = iterA.next();
-        valB = iterB.next();
-        if (!eq(valA.value, valB.value, aStack, bStack, customTesters)) {
-          return false;
-        }
-      } while (!valA.done && !valB.done);
-    } else {
-
-      // Objects with different constructors are not equivalent, but `Object`s
-      // or `Array`s from different frames are.
-      var aCtor = a.constructor, bCtor = b.constructor;
-      if (aCtor !== bCtor && !(isObjectConstructor(aCtor) &&
-                               isObjectConstructor(bCtor))) {
-        return false;
-      }
-    }
-
-    // Deep compare objects.
-    var aKeys = keys(a, className == '[object Array]'), key;
-    size = aKeys.length;
-
-    // Ensure that both objects contain the same number of properties before comparing deep equality.
-    if (keys(b, className == '[object Array]').length !== size) { return false; }
-
-    while (size--) {
-      key = aKeys[size];
-      // Deep compare each member
-      result = has(b, key) && eq(a[key], b[key], aStack, bStack, customTesters);
-
-      if (!result) {
-        return false;
-      }
-    }
-    // Remove the first object from the stack of traversed objects.
-    aStack.pop();
-    bStack.pop();
-
-    return result;
-
-    function keys(obj, isArray) {
-      var allKeys = Object.keys ? Object.keys(obj) :
-        (function(o) {
-            var keys = [];
-            for (var key in o) {
-                if (has(o, key)) {
-                    keys.push(key);
-                }
-            }
-            return keys;
-        })(obj);
-
-      if (!isArray) {
-        return allKeys;
-      }
-
-      var extraKeys = [];
-      if (allKeys.length === 0) {
-          return allKeys;
-      }
-
-      for (var x = 0; x < allKeys.length; x++) {
-          if (!allKeys[x].match(/^[0-9]+$/)) {
-              extraKeys.push(allKeys[x]);
-          }
-      }
-
-      return extraKeys;
-    }
-  }
-
-  function has(obj, key) {
-    return Object.prototype.hasOwnProperty.call(obj, key);
-  }
-
-  function isFunction(obj) {
-    return typeof obj === 'function';
-  }
-
-  function isObjectConstructor(ctor) {
-    // aCtor instanceof aCtor is true for the Object and Function
-    // constructors (since a constructor is-a Function and a function is-a
-    // Object). We don't just compare ctor === Object because the constructor
-    // might come from a different frame with different globals.
-    return isFunction(ctor) && ctor instanceof ctor;
-  }
-};
-
-getJasmineRequireObj().toBe = function() {
-  function toBe() {
-    return {
-      compare: function(actual, expected) {
-        return {
-          pass: actual === expected
-        };
-      }
-    };
-  }
-
-  return toBe;
-};
-
-getJasmineRequireObj().toBeCloseTo = function() {
-
-  function toBeCloseTo() {
-    return {
-      compare: function(actual, expected, precision) {
-        if (precision !== 0) {
-          precision = precision || 2;
-        }
-
-        return {
-          pass: Math.abs(expected - actual) < (Math.pow(10, -precision) / 2)
-        };
-      }
-    };
-  }
-
-  return toBeCloseTo;
-};
-
-getJasmineRequireObj().toBeDefined = function() {
-  function toBeDefined() {
-    return {
-      compare: function(actual) {
-        return {
-          pass: (void 0 !== actual)
-        };
-      }
-    };
-  }
-
-  return toBeDefined;
-};
-
-getJasmineRequireObj().toBeFalsy = function() {
-  function toBeFalsy() {
-    return {
-      compare: function(actual) {
-        return {
-          pass: !!!actual
-        };
-      }
-    };
-  }
-
-  return toBeFalsy;
-};
-
-getJasmineRequireObj().toBeGreaterThan = function() {
-
-  function toBeGreaterThan() {
-    return {
-      compare: function(actual, expected) {
-        return {
-          pass: actual > expected
-        };
-      }
-    };
-  }
-
-  return toBeGreaterThan;
-};
-
-
-getJasmineRequireObj().toBeGreaterThanOrEqual = function() {
-
-  function toBeGreaterThanOrEqual() {
-    return {
-      compare: function(actual, expected) {
-        return {
-          pass: actual >= expected
-        };
-      }
-    };
-  }
-
-  return toBeGreaterThanOrEqual;
-};
-
-getJasmineRequireObj().toBeLessThan = function() {
-  function toBeLessThan() {
-    return {
-
-      compare: function(actual, expected) {
-        return {
-          pass: actual < expected
-        };
-      }
-    };
-  }
-
-  return toBeLessThan;
-};
-getJasmineRequireObj().toBeLessThanOrEqual = function() {
-  function toBeLessThanOrEqual() {
-    return {
-
-      compare: function(actual, expected) {
-        return {
-          pass: actual <= expected
-        };
-      }
-    };
-  }
-
-  return toBeLessThanOrEqual;
-};
-
-getJasmineRequireObj().toBeNaN = function(j$) {
-
-  function toBeNaN() {
-    return {
-      compare: function(actual) {
-        var result = {
-          pass: (actual !== actual)
-        };
-
-        if (result.pass) {
-          result.message = 'Expected actual not to be NaN.';
-        } else {
-          result.message = function() { return 'Expected ' + j$.pp(actual) + ' to be NaN.'; };
-        }
-
-        return result;
-      }
-    };
-  }
-
-  return toBeNaN;
-};
-
-getJasmineRequireObj().toBeNull = function() {
-
-  function toBeNull() {
-    return {
-      compare: function(actual) {
-        return {
-          pass: actual === null
-        };
-      }
-    };
-  }
-
-  return toBeNull;
-};
-
-getJasmineRequireObj().toBeTruthy = function() {
-
-  function toBeTruthy() {
-    return {
-      compare: function(actual) {
-        return {
-          pass: !!actual
-        };
-      }
-    };
-  }
-
-  return toBeTruthy;
-};
-
-getJasmineRequireObj().toBeUndefined = function() {
-
-  function toBeUndefined() {
-    return {
-      compare: function(actual) {
-        return {
-          pass: void 0 === actual
-        };
-      }
-    };
-  }
-
-  return toBeUndefined;
-};
-
-getJasmineRequireObj().toContain = function() {
-  function toContain(util, customEqualityTesters) {
-    customEqualityTesters = customEqualityTesters || [];
-
-    return {
-      compare: function(actual, expected) {
-
-        return {
-          pass: util.contains(actual, expected, customEqualityTesters)
-        };
-      }
-    };
-  }
-
-  return toContain;
-};
-
-getJasmineRequireObj().toEqual = function() {
-
-  function toEqual(util, customEqualityTesters) {
-    customEqualityTesters = customEqualityTesters || [];
-
-    return {
-      compare: function(actual, expected) {
-        var result = {
-          pass: false
-        };
-
-        result.pass = util.equals(actual, expected, customEqualityTesters);
-
-        return result;
-      }
-    };
-  }
-
-  return toEqual;
-};
-
-getJasmineRequireObj().toHaveBeenCalled = function(j$) {
-
-  var getErrorMsg = j$.formatErrorMsg('<toHaveBeenCalled>', 'expect(<spyObj>).toHaveBeenCalled()');
-
-  function toHaveBeenCalled() {
-    return {
-      compare: function(actual) {
-        var result = {};
-
-        if (!j$.isSpy(actual)) {
-          throw new Error(getErrorMsg('Expected a spy, but got ' + j$.pp(actual) + '.'));
-        }
-
-        if (arguments.length > 1) {
-          throw new Error(getErrorMsg('Does not take arguments, use toHaveBeenCalledWith'));
-        }
-
-        result.pass = actual.calls.any();
-
-        result.message = result.pass ?
-          'Expected spy ' + actual.and.identity() + ' not to have been called.' :
-          'Expected spy ' + actual.and.identity() + ' to have been called.';
-
-        return result;
-      }
-    };
-  }
-
-  return toHaveBeenCalled;
-};
-
-getJasmineRequireObj().toHaveBeenCalledTimes = function(j$) {
-
-  var getErrorMsg = j$.formatErrorMsg('<toHaveBeenCalledTimes>', 'expect(<spyObj>).toHaveBeenCalledTimes(<Number>)');
-
-  function toHaveBeenCalledTimes() {
-    return {
-      compare: function(actual, expected) {
-        if (!j$.isSpy(actual)) {
-          throw new Error(getErrorMsg('Expected a spy, but got ' + j$.pp(actual) + '.'));
-        }
-
-        var args = Array.prototype.slice.call(arguments, 0),
-          result = { pass: false };
-
-        if (!j$.isNumber_(expected)){
-          throw new Error(getErrorMsg('The expected times failed is a required argument and must be a number.'));
-        }
-
-        actual = args[0];
-        var calls = actual.calls.count();
-        var timesMessage = expected === 1 ? 'once' : expected + ' times';
-        result.pass = calls === expected;
-        result.message = result.pass ?
-          'Expected spy ' + actual.and.identity() + ' not to have been called ' + timesMessage + '. It was called ' +  calls + ' times.' :
-          'Expected spy ' + actual.and.identity() + ' to have been called ' + timesMessage + '. It was called ' +  calls + ' times.';
-        return result;
-      }
-    };
-  }
-
-  return toHaveBeenCalledTimes;
-};
-
-getJasmineRequireObj().toHaveBeenCalledWith = function(j$) {
-
-  var getErrorMsg = j$.formatErrorMsg('<toHaveBeenCalledWith>', 'expect(<spyObj>).toHaveBeenCalledWith(...arguments)');
-
-  function toHaveBeenCalledWith(util, customEqualityTesters) {
-    return {
-      compare: function() {
-        var args = Array.prototype.slice.call(arguments, 0),
-          actual = args[0],
-          expectedArgs = args.slice(1),
-          result = { pass: false };
-
-        if (!j$.isSpy(actual)) {
-          throw new Error(getErrorMsg('Expected a spy, but got ' + j$.pp(actual) + '.'));
-        }
-
-        if (!actual.calls.any()) {
-          result.message = function() { return 'Expected spy ' + actual.and.identity() + ' to have been called with ' + j$.pp(expectedArgs) + ' but it was never called.'; };
-          return result;
-        }
-
-        if (util.contains(actual.calls.allArgs(), expectedArgs, customEqualityTesters)) {
-          result.pass = true;
-          result.message = function() { return 'Expected spy ' + actual.and.identity() + ' not to have been called with ' + j$.pp(expectedArgs) + ' but it was.'; };
-        } else {
-          result.message = function() { return 'Expected spy ' + actual.and.identity() + ' to have been called with ' + j$.pp(expectedArgs) + ' but actual calls were ' + j$.pp(actual.calls.allArgs()).replace(/^\[ | \]$/g, '') + '.'; };
-        }
-
-        return result;
-      }
-    };
-  }
-
-  return toHaveBeenCalledWith;
-};
-
-getJasmineRequireObj().toMatch = function(j$) {
-
-  var getErrorMsg = j$.formatErrorMsg('<toMatch>', 'expect(<expectation>).toMatch(<string> || <regexp>)');
-
-  function toMatch() {
-    return {
-      compare: function(actual, expected) {
-        if (!j$.isString_(expected) && !j$.isA_('RegExp', expected)) {
-          throw new Error(getErrorMsg('Expected is not a String or a RegExp'));
-        }
-
-        var regexp = new RegExp(expected);
-
-        return {
-          pass: regexp.test(actual)
-        };
-      }
-    };
-  }
-
-  return toMatch;
-};
-
-getJasmineRequireObj().toThrow = function(j$) {
-
-  var getErrorMsg = j$.formatErrorMsg('<toThrow>', 'expect(function() {<expectation>}).toThrow()');
-
-  function toThrow(util) {
-    return {
-      compare: function(actual, expected) {
-        var result = { pass: false },
-          threw = false,
-          thrown;
-
-        if (typeof actual != 'function') {
-          throw new Error(getErrorMsg('Actual is not a Function'));
-        }
-
-        try {
-          actual();
-        } catch (e) {
-          threw = true;
-          thrown = e;
-        }
-
-        if (!threw) {
-          result.message = 'Expected function to throw an exception.';
-          return result;
-        }
-
-        if (arguments.length == 1) {
-          result.pass = true;
-          result.message = function() { return 'Expected function not to throw, but it threw ' + j$.pp(thrown) + '.'; };
-
-          return result;
-        }
-
-        if (util.equals(thrown, expected)) {
-          result.pass = true;
-          result.message = function() { return 'Expected function not to throw ' + j$.pp(expected) + '.'; };
-        } else {
-          result.message = function() { return 'Expected function to throw ' + j$.pp(expected) + ', but it threw ' +  j$.pp(thrown) + '.'; };
-        }
-
-        return result;
-      }
-    };
-  }
-
-  return toThrow;
-};
-
-getJasmineRequireObj().toThrowError = function(j$) {
-
-  var getErrorMsg =  j$.formatErrorMsg('<toThrowError>', 'expect(function() {<expectation>}).toThrowError(<ErrorConstructor>, <message>)');
-
-  function toThrowError () {
-    return {
-      compare: function(actual) {
-        var threw = false,
-          pass = {pass: true},
-          fail = {pass: false},
-          thrown;
-
-        if (typeof actual != 'function') {
-          throw new Error(getErrorMsg('Actual is not a Function'));
-        }
-
-        var errorMatcher = getMatcher.apply(null, arguments);
-
-        try {
-          actual();
-        } catch (e) {
-          threw = true;
-          thrown = e;
-        }
-
-        if (!threw) {
-          fail.message = 'Expected function to throw an Error.';
-          return fail;
-        }
-
-        if (!(thrown instanceof Error)) {
-          fail.message = function() { return 'Expected function to throw an Error, but it threw ' + j$.pp(thrown) + '.'; };
-          return fail;
-        }
-
-        if (errorMatcher.hasNoSpecifics()) {
-          pass.message = 'Expected function not to throw an Error, but it threw ' + j$.fnNameFor(thrown) + '.';
-          return pass;
-        }
-
-        if (errorMatcher.matches(thrown)) {
-          pass.message = function() {
-            return 'Expected function not to throw ' + errorMatcher.errorTypeDescription + errorMatcher.messageDescription() + '.';
-          };
-          return pass;
-        } else {
-          fail.message = function() {
-            return 'Expected function to throw ' + errorMatcher.errorTypeDescription + errorMatcher.messageDescription() +
-              ', but it threw ' + errorMatcher.thrownDescription(thrown) + '.';
-          };
-          return fail;
-        }
-      }
-    };
-
-    function getMatcher() {
-      var expected = null,
-          errorType = null;
-
-      if (arguments.length == 2) {
-        expected = arguments[1];
-        if (isAnErrorType(expected)) {
-          errorType = expected;
-          expected = null;
-        }
-      } else if (arguments.length > 2) {
-        errorType = arguments[1];
-        expected = arguments[2];
-        if (!isAnErrorType(errorType)) {
-          throw new Error(getErrorMsg('Expected error type is not an Error.'));
-        }
-      }
-
-      if (expected && !isStringOrRegExp(expected)) {
-        if (errorType) {
-          throw new Error(getErrorMsg('Expected error message is not a string or RegExp.'));
-        } else {
-          throw new Error(getErrorMsg('Expected is not an Error, string, or RegExp.'));
-        }
-      }
-
-      function messageMatch(message) {
-        if (typeof expected == 'string') {
-          return expected == message;
-        } else {
-          return expected.test(message);
-        }
-      }
-
-      return {
-        errorTypeDescription: errorType ? j$.fnNameFor(errorType) : 'an exception',
-        thrownDescription: function(thrown) {
-          var thrownName = errorType ? j$.fnNameFor(thrown.constructor) : 'an exception',
-              thrownMessage = '';
-
-          if (expected) {
-            thrownMessage = ' with message ' + j$.pp(thrown.message);
-          }
-
-          return thrownName + thrownMessage;
-        },
-        messageDescription: function() {
-          if (expected === null) {
-            return '';
-          } else if (expected instanceof RegExp) {
-            return ' with a message matching ' + j$.pp(expected);
-          } else {
-            return ' with message ' + j$.pp(expected);
-          }
-        },
-        hasNoSpecifics: function() {
-          return expected === null && errorType === null;
-        },
-        matches: function(error) {
-          return (errorType === null || error instanceof errorType) &&
-            (expected === null || messageMatch(error.message));
-        }
-      };
-    }
-
-    function isStringOrRegExp(potential) {
-      return potential instanceof RegExp || (typeof potential == 'string');
-    }
-
-    function isAnErrorType(type) {
-      if (typeof type !== 'function') {
-        return false;
-      }
-
-      var Surrogate = function() {};
-      Surrogate.prototype = type.prototype;
-      return (new Surrogate()) instanceof Error;
-    }
-  }
-
-  return toThrowError;
-};
-
-getJasmineRequireObj().interface = function(jasmine, env) {
-  var jasmineInterface = {
-    describe: function(description, specDefinitions) {
-      return env.describe(description, specDefinitions);
-    },
-
-    xdescribe: function(description, specDefinitions) {
-      return env.xdescribe(description, specDefinitions);
-    },
-
-    fdescribe: function(description, specDefinitions) {
-      return env.fdescribe(description, specDefinitions);
-    },
-
-    it: function() {
-      return env.it.apply(env, arguments);
-    },
-
-    xit: function() {
-      return env.xit.apply(env, arguments);
-    },
-
-    fit: function() {
-      return env.fit.apply(env, arguments);
-    },
-
-    beforeEach: function() {
-      return env.beforeEach.apply(env, arguments);
-    },
-
-    afterEach: function() {
-      return env.afterEach.apply(env, arguments);
-    },
-
-    beforeAll: function() {
-      return env.beforeAll.apply(env, arguments);
-    },
-
-    afterAll: function() {
-      return env.afterAll.apply(env, arguments);
-    },
-
-    expect: function(actual) {
-      return env.expect(actual);
-    },
-
-    pending: function() {
-      return env.pending.apply(env, arguments);
-    },
-
-    fail: function() {
-      return env.fail.apply(env, arguments);
-    },
-
-    spyOn: function(obj, methodName) {
-      return env.spyOn(obj, methodName);
-    },
-
-    spyOnProperty: function(obj, methodName, accessType) {
-      return env.spyOnProperty(obj, methodName, accessType);
-    },
-
-    jsApiReporter: new jasmine.JsApiReporter({
-      timer: new jasmine.Timer()
-    }),
-
-    jasmine: jasmine
-  };
-
-  jasmine.addCustomEqualityTester = function(tester) {
-    env.addCustomEqualityTester(tester);
-  };
-
-  jasmine.addMatchers = function(matchers) {
-    return env.addMatchers(matchers);
-  };
-
-  jasmine.clock = function() {
-    return env.clock;
-  };
-
-  return jasmineInterface;
-};
-
 getJasmineRequireObj().version = function() {
   return '2.5.2';
 };
diff --git a/spec/core/PrettyPrintSpec.js b/spec/core/PrettyPrintSpec.js
index 301ba80e..3965ea73 100644
--- a/spec/core/PrettyPrintSpec.js
+++ b/spec/core/PrettyPrintSpec.js
@@ -99,6 +99,11 @@ describe("jasmineUnderTest.pp", function () {
     }, bar: [1, 2, 3]})).toEqual("Object({ foo: Function, bar: [ 1, 2, 3 ] })");
   });
 
+  it("should print 'null' as the constructor of an object with its own constructor property", function() {
+    expect(jasmineUnderTest.pp({constructor: function() {}})).toEqual("null({ constructor: Function })");
+    expect(jasmineUnderTest.pp({constructor: 'foo'})).toEqual("null({ constructor: 'foo' })");
+  });
+
   it("should not include inherited properties when stringifying an object", function() {
     var SomeClass = function SomeClass() {};
     SomeClass.prototype.foo = "inherited foo";
@@ -164,7 +169,6 @@ describe("jasmineUnderTest.pp", function () {
     }
   });
 
-
   it('should not do HTML escaping of strings', function() {
     expect(jasmineUnderTest.pp('some <b>html string</b> &', false)).toEqual('\'some <b>html string</b> &\'');
   });
diff --git a/spec/core/UtilSpec.js b/spec/core/UtilSpec.js
index e547edf1..faaca2c2 100644
--- a/spec/core/UtilSpec.js
+++ b/spec/core/UtilSpec.js
@@ -63,4 +63,37 @@ describe("jasmineUnderTest.util", function() {
       expect(actual).toEqual(expected);
     });
   });
+
+  describe("objectDifference", function() {
+    it("given two objects A and B, returns the properties in A not present in B", function() {
+      var a = {
+        foo: 3,
+        bar: 4,
+        baz: 5
+      };
+
+      var b = {
+        bar: 6,
+        quux: 7
+      };
+
+      expect(jasmineUnderTest.util.objectDifference(a, b)).toEqual({foo: 3, baz: 5})
+    });
+
+    it("only looks at own properties of both objects", function() {
+      function Foo() {}
+
+      Foo.prototype.x = 1;
+      Foo.prototype.y = 2;
+
+      var a = new Foo();
+      a.x = 1;
+
+      var b = new Foo();
+      b.y = 2;
+
+      expect(jasmineUnderTest.util.objectDifference(a, b)).toEqual({x: 1});
+      expect(jasmineUnderTest.util.objectDifference(b, a)).toEqual({y: 2});
+    })
+  })
 });
diff --git a/spec/core/integration/CustomMatchersSpec.js b/spec/core/integration/CustomMatchersSpec.js
index ad73bbb4..0b0ee92c 100644
--- a/spec/core/integration/CustomMatchersSpec.js
+++ b/spec/core/integration/CustomMatchersSpec.js
@@ -79,6 +79,30 @@ describe("Custom Matchers (Integration)", function() {
     env.execute();
   });
 
+  it("displays an appropriate failure message if a custom equality matcher fails", function(done) {
+    env.it("spec using custom equality matcher", function() {
+      var customEqualityFn = function(a, b) {
+        // "foo" is not equal to anything
+        if (a === 'foo' || b === 'foo') {
+          return false;
+        }
+      };
+
+      env.addCustomEqualityTester(customEqualityFn);
+      env.expect({foo: 'foo'}).toEqual({foo: 'foo'});
+    });
+
+    var specExpectations = function(result) {
+      expect(result.status).toEqual('failed');
+      expect(result.failedExpectations[0].message).toEqual(
+        "Expected $.foo = 'foo' to equal 'foo'."
+      );
+    };
+
+    env.addReporter({ specDone: specExpectations, jasmineDone: done });
+    env.execute();
+  });
+
   it("uses the negative compare function for a negative comparison, if provided", function(done) {
     env.it("spec with custom negative comparison matcher", function() {
       env.addMatchers({
diff --git a/spec/core/matchers/DiffBuilderSpec.js b/spec/core/matchers/DiffBuilderSpec.js
new file mode 100644
index 00000000..2fe8f1bf
--- /dev/null
+++ b/spec/core/matchers/DiffBuilderSpec.js
@@ -0,0 +1,47 @@
+describe("DiffBuilder", function() {
+  it("records the actual and expected objects", function() {
+    var diffBuilder = jasmineUnderTest.DiffBuilder();
+    diffBuilder.record({x: 'actual'}, {x: 'expected'});
+
+    expect(diffBuilder.getMessage()).toEqual("Expected Object({ x: 'actual' }) to equal Object({ x: 'expected' }).");
+  });
+
+  it("prints the path at which the difference was found", function() {
+    var diffBuilder = jasmineUnderTest.DiffBuilder();
+
+    diffBuilder.withPath('foo', function() {
+      diffBuilder.record({x: 'actual'}, {x: 'expected'});
+    });
+
+    expect(diffBuilder.getMessage()).toEqual("Expected $.foo = Object({ x: 'actual' }) to equal Object({ x: 'expected' }).");
+  });
+
+  it("prints multiple messages, separated by newlines", function() {
+    var diffBuilder = jasmineUnderTest.DiffBuilder();
+
+    diffBuilder.withPath('foo', function() {
+      diffBuilder.record(1, 2);
+    });
+
+    var message =
+      "Expected $.foo = 1 to equal 2.\n" +
+      "Expected 3 to equal 4.";
+
+    diffBuilder.record(3, 4);
+    expect(diffBuilder.getMessage()).toEqual(message);
+  });
+
+  it("allows customization of the message", function() {
+    var diffBuilder = jasmineUnderTest.DiffBuilder();
+
+    function darthVaderFormatter(actual, expected, path) {
+      return "I find your lack of " + expected + " disturbing. (was " + actual + ", at " + path + ")"
+    }
+
+    diffBuilder.withPath('x', function() {
+      diffBuilder.record('bar', 'foo', darthVaderFormatter);
+    });
+
+    expect(diffBuilder.getMessage()).toEqual("I find your lack of foo disturbing. (was bar, at $.x)");
+  });
+});
diff --git a/spec/core/matchers/NullDiffBuilderSpec.js b/spec/core/matchers/NullDiffBuilderSpec.js
new file mode 100644
index 00000000..a9aac3db
--- /dev/null
+++ b/spec/core/matchers/NullDiffBuilderSpec.js
@@ -0,0 +1,13 @@
+describe('NullDiffBuilder', function() {
+  it('responds to withPath() by calling the passed function', function() {
+    var spy = jasmine.createSpy('callback');
+    jasmineUnderTest.NullDiffBuilder().withPath('does not matter', spy);
+    expect(spy).toHaveBeenCalled();
+  });
+
+  it('responds to record()', function() {
+    expect(function() {
+      jasmineUnderTest.NullDiffBuilder().record('does not matter');
+    }).not.toThrow();
+  })
+});
diff --git a/spec/core/matchers/ObjectPathSpec.js b/spec/core/matchers/ObjectPathSpec.js
new file mode 100644
index 00000000..88b023d1
--- /dev/null
+++ b/spec/core/matchers/ObjectPathSpec.js
@@ -0,0 +1,43 @@
+describe('ObjectPath', function() {
+  var ObjectPath = jasmineUnderTest.ObjectPath;
+
+  it('represents the path to a node in an object tree', function() {
+    expect(new ObjectPath(['foo', 'bar']).toString()).toEqual('$.foo.bar');
+  });
+
+  it('has a depth', function() {
+    expect(new ObjectPath().depth()).toEqual(0);
+    expect(new ObjectPath(['foo']).depth()).toEqual(1);
+  });
+
+  it('renders numbers as array access', function() {
+    expect(new ObjectPath(['foo', 0]).toString()).toEqual('$.foo[0]');
+  });
+
+  it('renders properties that are valid identifiers with dot notation', function() {
+    expect(new ObjectPath(['foo123']).toString()).toEqual('$.foo123');
+    expect(new ObjectPath(['x_y']).toString()).toEqual('$.x_y');
+    expect(new ObjectPath(['A$B']).toString()).toEqual('$.A$B');
+  });
+
+  it('renders properties with non-identifier-safe characters with square bracket notation', function() {
+    expect(new ObjectPath(['a b c']).toString()).toEqual("$['a b c']");
+    expect(new ObjectPath(['1hello']).toString()).toEqual("$['1hello']");
+  });
+
+  it('renders as the empty string when empty', function() {
+    expect(new ObjectPath().toString()).toEqual('');
+  });
+
+  it('stringifies properties that are not strings or numbers', function() {
+    expect(new ObjectPath([{}]).toString()).toEqual("$['[object Object]']");
+  });
+
+  it('can be created based on another path', function() {
+    var root = new ObjectPath();
+    var path = root.add('foo');
+
+    expect(path.toString()).toEqual('$.foo');
+    expect(root.toString()).toEqual('');
+  })
+});
diff --git a/spec/core/matchers/matchersUtilSpec.js b/spec/core/matchers/matchersUtilSpec.js
index d5c9c200..3a8054a7 100644
--- a/spec/core/matchers/matchersUtilSpec.js
+++ b/spec/core/matchers/matchersUtilSpec.js
@@ -61,10 +61,14 @@ describe("matchersUtil", function() {
       expect(jasmineUnderTest.matchersUtil.equals(foo, [undefined])).toBe(true);
     });
 
-    it("fails for Arrays that are not equivalent", function() {
+    it("fails for Arrays that have different lengths", function() {
       expect(jasmineUnderTest.matchersUtil.equals([1, 2], [1, 2, 3])).toBe(false);
     });
 
+    it("fails for Arrays that have different elements", function() {
+      expect(jasmineUnderTest.matchersUtil.equals([1, 2, 3], [1, 5, 3])).toBe(false);
+    });
+
     it("fails for Arrays whose contents are equivalent, but have differing properties", function() {
       var one = [1,2,3],
           two = [1,2,3];
@@ -136,6 +140,13 @@ describe("matchersUtil", function() {
       expect(jasmineUnderTest.matchersUtil.equals(actual, expected)).toBe(false);
     });
 
+    it("fails for Objects that have the same number of keys, but different keys/values", function () {
+      var expected = { a: undefined },
+        actual = { b: 1 };
+
+      expect(jasmineUnderTest.matchersUtil.equals(actual, expected)).toBe(false);
+    })
+
     it("fails when comparing an empty object to an empty array (issue #114)", function() {
       var emptyObject = {},
         emptyArray = [];
diff --git a/spec/core/matchers/toEqualSpec.js b/spec/core/matchers/toEqualSpec.js
index f038f9e9..2ac0a367 100644
--- a/spec/core/matchers/toEqualSpec.js
+++ b/spec/core/matchers/toEqualSpec.js
@@ -1,20 +1,39 @@
 describe("toEqual", function() {
+  "use strict";
+
+  function compareEquals(actual, expected) {
+    var util = jasmineUnderTest.matchersUtil,
+      matcher = jasmineUnderTest.matchers.toEqual(util);
+
+    var result = matcher.compare(actual, expected);
+
+    return result;
+  }
+
   it("delegates to equals function", function() {
     var util = {
-        equals: jasmine.createSpy('delegated-equals').and.returnValue(true)
+        equals: jasmine.createSpy('delegated-equals').and.returnValue(true),
+        buildFailureMessage: function() {
+          return 'does not matter'
+        },
+        DiffBuilder: jasmineUnderTest.matchersUtil.DiffBuilder
       },
       matcher = jasmineUnderTest.matchers.toEqual(util),
       result;
 
     result = matcher.compare(1, 1);
 
-    expect(util.equals).toHaveBeenCalledWith(1, 1, []);
+    expect(util.equals).toHaveBeenCalledWith(1, 1, [], jasmine.anything());
     expect(result.pass).toBe(true);
   });
 
   it("delegates custom equality testers, if present", function() {
     var util = {
-        equals: jasmine.createSpy('delegated-equals').and.returnValue(true)
+        equals: jasmine.createSpy('delegated-equals').and.returnValue(true),
+        buildFailureMessage: function() {
+          return 'does not matter'
+        },
+        DiffBuilder: jasmineUnderTest.matchersUtil.DiffBuilder
       },
       customEqualityTesters = ['a', 'b'],
       matcher = jasmineUnderTest.matchers.toEqual(util, customEqualityTesters),
@@ -22,7 +41,457 @@ describe("toEqual", function() {
 
     result = matcher.compare(1, 1);
 
-    expect(util.equals).toHaveBeenCalledWith(1, 1, ['a', 'b']);
+    expect(util.equals).toHaveBeenCalledWith(1, 1, ['a', 'b'], jasmine.anything());
     expect(result.pass).toBe(true);
   });
+
+  it("reports the difference between objects that are not equal", function() {
+    var actual = {x: 1, y: 3},
+      expected = {x: 2, y: 3},
+      message = "Expected $.x = 1 to equal 2.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports the difference between nested objects that are not equal", function() {
+    var actual = {x: {y: 1}},
+      expected = {x: {y: 2}},
+      message = "Expected $.x.y = 1 to equal 2.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("formats property access so that it's valid JavaScript", function() {
+    var actual = {'my prop': 1},
+      expected = {'my prop': 2},
+      message = "Expected $['my prop'] = 1 to equal 2.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports missing properties", function() {
+    var actual = {x: {}},
+      expected = {x: {y: 1}},
+      message =
+        "Expected $.x to have properties\n" +
+        "    y: 1";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports extra properties", function() {
+    var actual = {x: {y: 1, z: 2}},
+      expected = {x: {}},
+      message =
+        "Expected $.x not to have properties\n" +
+        "    y: 1\n" +
+        "    z: 2";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("pretty-prints properties", function() {
+    var actual = {x: {y: 'foo bar'}},
+      expected = {x: {}},
+      message =
+        "Expected $.x not to have properties\n" +
+        "    y: 'foo bar'"
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports extra and missing properties together", function() {
+    var actual = {x: {y: 1, z: 2, f: 4}},
+      expected = {x: {y: 1, z: 2, g: 3}},
+      message =
+        "Expected $.x to have properties\n" +
+        "    g: 3\n" +
+        "Expected $.x not to have properties\n" +
+        "    f: 4";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports extra and missing properties of the root-level object", function() {
+    var actual = {x: 1},
+      expected = {a: 1},
+      message =
+        "Expected object to have properties\n" +
+        "    a: 1\n" +
+        "Expected object not to have properties\n" +
+        "    x: 1";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports multiple incorrect values", function() {
+    var actual = {x: 1, y: 2},
+      expected = {x: 3, y: 4},
+      message =
+        "Expected $.x = 1 to equal 3.\n" +
+        "Expected $.y = 2 to equal 4.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatch between actual child object and expected child number", function() {
+    var actual = {x: {y: 2}},
+      expected = {x: 1},
+      message = "Expected $.x = Object({ y: 2 }) to equal 1.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("uses the default failure message if actual is not an object", function() {
+    var actual = 1,
+      expected = {x: {}},
+      message = "Expected 1 to equal Object({ x: Object({  }) }).";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("uses the default failure message if expected is not an object", function() {
+    var actual = {x: {}},
+      expected = 1,
+      message = "Expected Object({ x: Object({  }) }) to equal 1.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("uses the default failure message given arrays with different lengths", function() {
+    var actual = [1, 2],
+      expected = [1, 2, 3],
+      message =
+        "Expected [ 1, 2 ] to equal [ 1, 2, 3 ].";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports a mismatch between elements of equal-length arrays", function() {
+    var actual = [1, 2, 5],
+      expected = [1, 2, 3],
+      message = "Expected $[2] = 5 to equal 3.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports a mismatch between multiple array elements", function() {
+    var actual = [2, 2, 5],
+      expected = [1, 2, 3],
+      message =
+        "Expected $[0] = 2 to equal 1.\n" +
+        "Expected $[2] = 5 to equal 3.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports a mismatch between properties of objects in arrays", function() {
+    var actual = [{x: 1}],
+      expected = [{x: 2}],
+      message = "Expected $[0].x = 1 to equal 2.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports a mismatch between arrays in objects", function() {
+    var actual = {x: [1]},
+      expected = {x: [2]},
+      message =
+        "Expected $.x[0] = 1 to equal 2.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between nested arrays", function() {
+    var actual = [[1]],
+      expected = [[2]],
+      message =
+        "Expected $[0][0] = 1 to equal 2.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving NaN", function() {
+    var actual = {x: 0},
+      expected = {x: 0/0},
+      message = "Expected $.x = 0 to equal NaN.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving regular expressions", function() {
+    var actual = {x: '1'},
+      expected = {x: /1/},
+      message = "Expected $.x = '1' to equal /1/.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving infinities", function() {
+    var actual = {x: 0},
+      expected = {x: 1/0},
+      message = "Expected $.x = 0 to equal Infinity.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving booleans", function() {
+    var actual = {x: false},
+      expected = {x: true},
+      message = "Expected $.x = false to equal true.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving strings", function() {
+    var actual = {x: 'foo'},
+      expected = {x: 'bar'},
+      message = "Expected $.x = 'foo' to equal 'bar'.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving undefined", function() {
+    var actual = {x: void 0},
+      expected = {x: 0},
+      message = "Expected $.x = undefined to equal 0.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches involving null", function() {
+    var actual = {x: null},
+      expected = {x: 0},
+      message = "Expected $.x = null to equal 0.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between objects with different constructors", function () {
+    function Foo() {}
+    function Bar() {}
+
+    var actual = {x: new Foo()},
+        expected = {x: new Bar()},
+        message = "Expected $.x to be a kind of Bar, but was Foo({  }).";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports type mismatches at the root level", function () {
+    function Foo() {}
+    function Bar() {}
+
+    var actual = new Foo(),
+      expected = new Bar(),
+      message = "Expected object to be a kind of Bar, but was Foo({  }).";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between objects with their own constructor property", function () {
+    function Foo() {}
+    function Bar() {}
+
+    var actual = {x: {constructor: 'blerf'}},
+        expected = {x: {constructor: 'ftarrh'}},
+        message = "Expected $.x.constructor = 'blerf' to equal 'ftarrh'.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between an object with a real constructor and one with its own constructor property", function () {
+    function Foo() {}
+    function Bar() {}
+
+    var actual = {x: {}},
+      expected = {x: {constructor: 'ftarrh'}},
+      message =
+        "Expected $.x to have properties\n" +
+        "    constructor: 'ftarrh'";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+    expect(compareEquals(expected, actual).message).toEqual(
+      "Expected $.x not to have properties\n    constructor: 'ftarrh'"
+    );
+  });
+
+  it("reports mismatches between 0 and -0", function() {
+    var actual = {x: 0},
+      expected = {x: -0},
+      message = "Expected $.x = 0 to equal -0.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between Errors", function() {
+    var actual = {x: new Error("the error you got")},
+      expected = {x: new Error("the error you want")},
+      message = "Expected $.x = Error: the error you got to equal Error: the error you want.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between Functions", function() {
+    var actual = {x: function() {}},
+      expected = {x: function() {}},
+      message = "Expected $.x = Function to equal Function.";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("does not report deep mismatches within Sets", function() {
+    // TODO: implement deep comparison of set elements
+    jasmine.getEnv().requireFunctioningSets();
+
+    var actual = new Set([1]),
+      expected = new Set([2]),
+      message = 'Expected Set( 1 ) to equal Set( 2 ).';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between Sets nested in objects", function() {
+    jasmine.getEnv().requireFunctioningSets();
+
+    var actual = {sets: [new Set([1])]},
+      expected = {sets: [new Set([2])]},
+      message = "Expected $.sets[0] = Set( 1 ) to equal Set( 2 ).";
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports mismatches between Sets of different lengths", function() {
+    jasmine.getEnv().requireFunctioningSets();
+
+    var actual = new Set([1, 2]),
+      expected = new Set([2]),
+      message = 'Expected Set( 1, 2 ) to equal Set( 2 ).';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  function isNotRunningInBrowser() {
+    return typeof document === 'undefined'
+  }
+
+  it("reports mismatches between DOM nodes with different tags", function() {
+    if(isNotRunningInBrowser()) {
+      return;
+    }
+
+    var actual = {a: document.createElement('div')},
+      expected = {a: document.createElement('p')},
+      message = 'Expected $.a = HTMLNode to equal HTMLNode.';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it('reports mismatches between DOM nodes with different content', function() {
+    if(isNotRunningInBrowser()) {
+      return;
+    }
+
+    var nodeA = document.createElement('div'),
+      nodeB = document.createElement('div');
+
+    nodeA.innerText = 'foo'
+    nodeB.innerText = 'bar'
+
+    var actual = {a: nodeA},
+      expected = {a: nodeB},
+      message = 'Expected $.a = HTMLNode to equal HTMLNode.';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  })
+
+  it("reports mismatches between a DOM node and a bare Object", function() {
+    if(isNotRunningInBrowser()) {
+      return;
+    }
+
+    var actual = {a: document.createElement('div')},
+      expected = {a: {}},
+      message = 'Expected $.a = HTMLNode to equal Object({  }).';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  });
+
+  it("reports asymmetric mismatches", function() {
+    var actual = {a: 1},
+      expected = {a: jasmineUnderTest.any(String)},
+      message = 'Expected $.a = 1 to equal <jasmine.any(String)>.';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+    expect(compareEquals(actual, expected).pass).toBe(false)
+  });
+
+  it("reports asymmetric mismatches when the asymmetric comparand is the actual value", function() {
+    var actual = {a: jasmineUnderTest.any(String)},
+      expected = {a: 1},
+      message = 'Expected $.a = <jasmine.any(String)> to equal 1.';
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+    expect(compareEquals(actual, expected).pass).toBe(false)
+  });
+
+  it("does not report a mismatch when asymmetric matchers are satisfied", function() {
+    var actual = {a: 'a'},
+      expected = {a: jasmineUnderTest.any(String)},
+      message = 'Expected $.a = 1 to equal <jasmine.any(String)>.';
+
+    expect(compareEquals(actual, expected).pass).toBe(true)
+  });
+
+  it("works on big complex stuff", function() {
+    var actual = {
+      foo: [
+        {bar: 1, things: ['a', 'b']},
+        {bar: 2, things: ['a', 'b']}
+      ],
+      baz: [
+        {a: {b: 1}}
+      ],
+      quux: 1,
+      nan: 0,
+      aRegexp: 'hi',
+      inf: -1/0,
+      boolean: false,
+      notDefined: 0,
+      aNull: void 0
+    }
+
+    var expected = {
+      foo: [
+        {bar: 2, things: ['a', 'b', 'c']},
+        {bar: 2, things: ['a', 'd']}
+      ],
+      baz: [
+        {a: {b: 1, c: 1}}
+      ],
+      quux: [],
+      nan: 0/0,
+      aRegexp: /hi/,
+      inf: 1/0,
+      boolean: true,
+      notDefined: void 0,
+      aNull: null
+    }
+
+    var message =
+      'Expected $.foo[0].bar = 1 to equal 2.\n' +
+      "Expected $.foo[0].things = [ 'a', 'b' ] to equal [ 'a', 'b', 'c' ].\n" +
+      "Expected $.foo[1].things[1] = 'b' to equal 'd'.\n" +
+      'Expected $.baz[0].a to have properties\n' +
+      '    c: 1\n' +
+      'Expected $.quux = 1 to equal [  ].\n' +
+      'Expected $.nan = 0 to equal NaN.\n' +
+      "Expected $.aRegexp = 'hi' to equal /hi/.\n" +
+      'Expected $.inf = -Infinity to equal Infinity.\n' +
+      'Expected $.boolean = false to equal true.\n' +
+      'Expected $.notDefined = 0 to equal undefined.\n' +
+      'Expected $.aNull = undefined to equal null.'
+
+    expect(compareEquals(actual, expected).message).toEqual(message);
+  })
 });
diff --git a/src/core/PrettyPrinter.js b/src/core/PrettyPrinter.js
index 4aebd96f..d945d0c7 100644
--- a/src/core/PrettyPrinter.js
+++ b/src/core/PrettyPrinter.js
@@ -145,7 +145,13 @@ getJasmineRequireObj().pp = function(j$) {
   };
 
   StringPrettyPrinter.prototype.emitObject = function(obj) {
-    var constructorName = obj.constructor ? j$.fnNameFor(obj.constructor) : 'null';
+    var ctor = obj.constructor,
+        constructorName;
+
+    constructorName = typeof ctor === 'function' && obj instanceof ctor ?
+      j$.fnNameFor(obj.constructor) :
+      'null';
+
     this.append(constructorName);
 
     if (this.ppNestLevel_ > j$.MAX_PRETTY_PRINT_DEPTH) {
diff --git a/src/core/matchers/DiffBuilder.js b/src/core/matchers/DiffBuilder.js
new file mode 100644
index 00000000..131b5b92
--- /dev/null
+++ b/src/core/matchers/DiffBuilder.js
@@ -0,0 +1,33 @@
+getJasmineRequireObj().DiffBuilder = function(j$) {
+  return function DiffBuilder() {
+    var path = new j$.ObjectPath(),
+        mismatches = [];
+
+    return {
+      record: function (actual, expected, formatter) {
+        formatter = formatter || defaultFormatter;
+        mismatches.push(formatter(actual, expected, path));
+      },
+
+      getMessage: function () {
+        return mismatches.join('\n');
+      },
+
+      withPath: function (pathComponent, block) {
+        var oldPath = path;
+        path = path.add(pathComponent);
+        block();
+        path = oldPath;
+      }
+    };
+
+    function defaultFormatter (actual, expected, path) {
+      return 'Expected ' +
+        path + (path.depth() ? ' = ' : '') +
+        j$.pp(actual) +
+        ' to equal ' +
+        j$.pp(expected) +
+        '.';
+    }
+  };
+};
diff --git a/src/core/matchers/NullDiffBuilder.js b/src/core/matchers/NullDiffBuilder.js
new file mode 100644
index 00000000..de7d3464
--- /dev/null
+++ b/src/core/matchers/NullDiffBuilder.js
@@ -0,0 +1,10 @@
+getJasmineRequireObj().NullDiffBuilder = function(j$) {
+  return function() {
+    return {
+      withPath: function(_, block) {
+        block();
+      },
+      record: function() {}
+    };
+  };
+};
diff --git a/src/core/matchers/ObjectPath.js b/src/core/matchers/ObjectPath.js
new file mode 100644
index 00000000..cd1629e2
--- /dev/null
+++ b/src/core/matchers/ObjectPath.js
@@ -0,0 +1,47 @@
+getJasmineRequireObj().ObjectPath = function(j$) {
+  function ObjectPath(components) {
+    this.components = components || [];
+  }
+
+  ObjectPath.prototype.toString = function() {
+    if (this.components.length) {
+      return '$' + map(this.components, formatPropertyAccess).join('');
+    } else {
+      return '';
+    }
+  };
+
+  ObjectPath.prototype.add = function(component) {
+    return new ObjectPath(this.components.concat([component]));
+  };
+
+  ObjectPath.prototype.depth = function() {
+    return this.components.length;
+  };
+
+  function formatPropertyAccess(prop) {
+    if (typeof prop === 'number') {
+      return '[' + prop + ']';
+    }
+
+    if (isValidIdentifier(prop)) {
+      return '.' + prop;
+    }
+
+    return '[\'' + prop + '\']';
+  }
+
+  function map(array, fn) {
+    var results = [];
+    for (var i = 0; i < array.length; i++) {
+      results.push(fn(array[i]));
+    }
+    return results;
+  }
+
+  function isValidIdentifier(string) {
+    return /^[A-Za-z\$_][A-Za-z0-9\$_]*$/.test(string);
+  }
+
+  return ObjectPath;
+};
diff --git a/src/core/matchers/matchersUtil.js b/src/core/matchers/matchersUtil.js
index 52dfaece..5998c393 100644
--- a/src/core/matchers/matchersUtil.js
+++ b/src/core/matchers/matchersUtil.js
@@ -2,11 +2,7 @@ getJasmineRequireObj().matchersUtil = function(j$) {
   // TODO: what to do about jasmine.pp not being inject? move to JSON.stringify? gut PrettyPrinter?
 
   return {
-    equals: function(a, b, customTesters) {
-      customTesters = customTesters || [];
-
-      return eq(a, b, [], [], customTesters);
-    },
+    equals: equals,
 
     contains: function(haystack, needle, customTesters) {
       customTesters = customTesters || [];
@@ -19,7 +15,7 @@ getJasmineRequireObj().matchersUtil = function(j$) {
         (!!haystack && !haystack.indexOf))
       {
         for (var i = 0; i < haystack.length; i++) {
-          if (eq(haystack[i], needle, [], [], customTesters)) {
+          if (equals(haystack[i], needle, customTesters)) {
             return true;
           }
         }
@@ -59,67 +55,113 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     return obj && j$.isA_('Function', obj.asymmetricMatch);
   }
 
-  function asymmetricMatch(a, b, customTesters) {
+  function asymmetricMatch(a, b, customTesters, diffBuilder) {
     var asymmetricA = isAsymmetric(a),
-        asymmetricB = isAsymmetric(b);
+        asymmetricB = isAsymmetric(b),
+        result;
 
     if (asymmetricA && asymmetricB) {
       return undefined;
     }
 
     if (asymmetricA) {
-      return a.asymmetricMatch(b, customTesters);
+      result = a.asymmetricMatch(b, customTesters);
+      diffBuilder.record(a, b);
+      return result;
     }
 
     if (asymmetricB) {
-      return b.asymmetricMatch(a, customTesters);
+      result = b.asymmetricMatch(a, customTesters);
+      diffBuilder.record(a, b);
+      return result;
     }
   }
 
+  function equals(a, b, customTesters, diffBuilder) {
+    customTesters = customTesters || [];
+    diffBuilder = diffBuilder || j$.NullDiffBuilder();
+
+    return eq(a, b, [], [], customTesters, diffBuilder);
+  }
+
   // Equality function lovingly adapted from isEqual in
   //   [Underscore](http://underscorejs.org)
-  function eq(a, b, aStack, bStack, customTesters) {
-    var result = true;
+  function eq(a, b, aStack, bStack, customTesters, diffBuilder) {
+    var result = true, i;
 
-    var asymmetricResult = asymmetricMatch(a, b, customTesters);
+    var asymmetricResult = asymmetricMatch(a, b, customTesters, diffBuilder);
     if (!j$.util.isUndefined(asymmetricResult)) {
       return asymmetricResult;
     }
 
-    for (var i = 0; i < customTesters.length; i++) {
+    for (i = 0; i < customTesters.length; i++) {
       var customTesterResult = customTesters[i](a, b);
       if (!j$.util.isUndefined(customTesterResult)) {
+        if (!customTesterResult) {
+          diffBuilder.record(a, b);
+        }
         return customTesterResult;
       }
     }
 
     if (a instanceof Error && b instanceof Error) {
-      return a.message == b.message;
+      result = a.message == b.message;
+      if (!result) {
+        diffBuilder.record(a, b);
+      }
+      return result;
     }
 
     // Identical objects are equal. `0 === -0`, but they aren't identical.
     // See the [Harmony `egal` proposal](http://wiki.ecmascript.org/doku.php?id=harmony:egal).
-    if (a === b) { return a !== 0 || 1 / a == 1 / b; }
+    if (a === b) {
+      result = a !== 0 || 1 / a == 1 / b;
+      if (!result) {
+        diffBuilder.record(a, b);
+      }
+      return result;
+    }
     // A strict comparison is necessary because `null == undefined`.
-    if (a === null || b === null) { return a === b; }
+    if (a === null || b === null) {
+      result = a === b;
+      if (!result) {
+        diffBuilder.record(a, b);
+      }
+      return result;
+    }
     var className = Object.prototype.toString.call(a);
-    if (className != Object.prototype.toString.call(b)) { return false; }
+    if (className != Object.prototype.toString.call(b)) {
+      diffBuilder.record(a, b);
+      return false;
+    }
     switch (className) {
       // Strings, numbers, dates, and booleans are compared by value.
       case '[object String]':
         // Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
         // equivalent to `new String("5")`.
-        return a == String(b);
+        result = a == String(b);
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
       case '[object Number]':
         // `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
         // other numeric values.
-        return a != +a ? b != +b : (a === 0 ? 1 / a == 1 / b : a == +b);
+        result = a != +a ? b != +b : (a === 0 ? 1 / a == 1 / b : a == +b);
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
       case '[object Date]':
       case '[object Boolean]':
         // Coerce dates and booleans to numeric primitive values. Dates are compared by their
         // millisecond representations. Note that invalid dates with millisecond representations
         // of `NaN` are not equivalent.
-        return +a == +b;
+        result = +a == +b;
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
       // RegExps are compared by their source patterns and flags.
       case '[object RegExp]':
         return a.source == b.source &&
@@ -127,14 +169,21 @@ getJasmineRequireObj().matchersUtil = function(j$) {
           a.multiline == b.multiline &&
           a.ignoreCase == b.ignoreCase;
     }
-    if (typeof a != 'object' || typeof b != 'object') { return false; }
+    if (typeof a != 'object' || typeof b != 'object') {
+      diffBuilder.record(a, b);
+      return false;
+    }
 
     var aIsDomNode = j$.isDomNode(a);
     var bIsDomNode = j$.isDomNode(b);
     if (aIsDomNode && bIsDomNode) {
       // At first try to use DOM3 method isEqualNode
       if (a.isEqualNode) {
-        return a.isEqualNode(b);
+        result = a.isEqualNode(b);
+        if (!result) {
+          diffBuilder.record(a, b);
+        }
+        return result;
       }
       // IE8 doesn't support isEqualNode, try to use outerHTML && innerText
       var aIsElement = a instanceof Element;
@@ -168,17 +217,21 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     if (className == '[object Array]') {
       size = a.length;
       if (size !== b.length) {
+        diffBuilder.record(a, b);
         return false;
       }
 
-      while (size--) {
-        result = eq(a[size], b[size], aStack, bStack, customTesters);
-        if (!result) {
-          return false;
-        }
+      for (i = 0; i < size; i++) {
+        diffBuilder.withPath(i, function() {
+          result = eq(a[i], b[i], aStack, bStack, customTesters, diffBuilder) && result;
+        });
+      }
+      if (!result) {
+        return false;
       }
     } else if (className == '[object Set]') {
       if (a.size != b.size) {
+        diffBuilder.record(a, b);
         return false;
       }
       var iterA = a.values(), iterB = b.values();
@@ -186,7 +239,8 @@ getJasmineRequireObj().matchersUtil = function(j$) {
       do {
         valA = iterA.next();
         valB = iterB.next();
-        if (!eq(valA.value, valB.value, aStack, bStack, customTesters)) {
+        if (!eq(valA.value, valB.value, aStack, bStack, customTesters, j$.NullDiffBuilder())) {
+          diffBuilder.record(a, b);
           return false;
         }
       } while (!valA.done && !valB.done);
@@ -195,8 +249,12 @@ getJasmineRequireObj().matchersUtil = function(j$) {
       // Objects with different constructors are not equivalent, but `Object`s
       // or `Array`s from different frames are.
       var aCtor = a.constructor, bCtor = b.constructor;
-      if (aCtor !== bCtor && !(isObjectConstructor(aCtor) &&
-                               isObjectConstructor(bCtor))) {
+      if (aCtor !== bCtor &&
+          isFunction(aCtor) && isFunction(bCtor) &&
+          a instanceof aCtor && b instanceof bCtor &&
+          !(aCtor instanceof aCtor && bCtor instanceof bCtor)) {
+
+        diffBuilder.record(a, b, constructorsAreDifferentFormatter);
         return false;
       }
     }
@@ -206,52 +264,66 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     size = aKeys.length;
 
     // Ensure that both objects contain the same number of properties before comparing deep equality.
-    if (keys(b, className == '[object Array]').length !== size) { return false; }
-
-    while (size--) {
-      key = aKeys[size];
-      // Deep compare each member
-      result = has(b, key) && eq(a[key], b[key], aStack, bStack, customTesters);
-
-      if (!result) {
-        return false;
-      }
+    if (keys(b, className == '[object Array]').length !== size) {
+      diffBuilder.record(a, b, objectKeysAreDifferentFormatter);
+      return false;
     }
+
+    for (i = 0; i < size; i++) {
+      key = aKeys[i];
+      // Deep compare each member
+      if (!j$.util.has(b, key)) {
+        diffBuilder.record(a, b, objectKeysAreDifferentFormatter);
+        result = false;
+        continue;
+      }
+
+      diffBuilder.withPath(key, function() {
+        if(!eq(a[key], b[key], aStack, bStack, customTesters, diffBuilder)) {
+          result = false;
+        }
+      });
+    }
+
+    if (!result) {
+      return false;
+    }
+
     // Remove the first object from the stack of traversed objects.
     aStack.pop();
     bStack.pop();
 
     return result;
+  }
 
-    function keys(obj, isArray) {
-      var allKeys = Object.keys ? Object.keys(obj) :
-        (function(o) {
-            var keys = [];
-            for (var key in o) {
-                if (has(o, key)) {
-                    keys.push(key);
-                }
-            }
-            return keys;
-        })(obj);
-
-      if (!isArray) {
-        return allKeys;
-      }
-
-      var extraKeys = [];
-      if (allKeys.length === 0) {
-          return allKeys;
-      }
-
-      for (var x = 0; x < allKeys.length; x++) {
-          if (!allKeys[x].match(/^[0-9]+$/)) {
-              extraKeys.push(allKeys[x]);
+  function keys(obj, isArray) {
+    var allKeys = Object.keys ? Object.keys(obj) :
+      (function(o) {
+          var keys = [];
+          for (var key in o) {
+              if (j$.util.has(o, key)) {
+                  keys.push(key);
+              }
           }
-      }
+          return keys;
+      })(obj);
 
-      return extraKeys;
+    if (!isArray) {
+      return allKeys;
     }
+
+    if (allKeys.length === 0) {
+        return allKeys;
+    }
+
+    var extraKeys = [];
+    for (var i in allKeys) {
+      if (!allKeys[i].match(/^[0-9]+$/)) {
+        extraKeys.push(allKeys[i]);
+      }
+    }
+
+    return extraKeys;
   }
 
   function has(obj, key) {
@@ -262,11 +334,44 @@ getJasmineRequireObj().matchersUtil = function(j$) {
     return typeof obj === 'function';
   }
 
-  function isObjectConstructor(ctor) {
-    // aCtor instanceof aCtor is true for the Object and Function
-    // constructors (since a constructor is-a Function and a function is-a
-    // Object). We don't just compare ctor === Object because the constructor
-    // might come from a different frame with different globals.
-    return isFunction(ctor) && ctor instanceof ctor;
+  function objectKeysAreDifferentFormatter(actual, expected, path) {
+    var missingProperties = j$.util.objectDifference(expected, actual),
+        extraProperties = j$.util.objectDifference(actual, expected),
+        missingPropertiesMessage = formatKeyValuePairs(missingProperties),
+        extraPropertiesMessage = formatKeyValuePairs(extraProperties),
+        messages = [];
+
+    if (!path.depth()) {
+      path = 'object';
+    }
+
+    if (missingPropertiesMessage.length) {
+      messages.push('Expected ' + path + ' to have properties' + missingPropertiesMessage);
+    }
+
+    if (extraPropertiesMessage.length) {
+      messages.push('Expected ' + path + ' not to have properties' + extraPropertiesMessage);
+    }
+
+    return messages.join('\n');
+  }
+
+  function constructorsAreDifferentFormatter(actual, expected, path) {
+    if (!path.depth()) {
+      path = 'object';
+    }
+
+    return 'Expected ' +
+      path + ' to be a kind of ' +
+      expected.constructor.name +
+      ', but was ' + j$.pp(actual) + '.';
+  }
+
+  function formatKeyValuePairs(obj) {
+    var formatted = '';
+    for (var key in obj) {
+      formatted += '\n    ' + key + ': ' + j$.pp(obj[key]);
+    }
+    return formatted;
   }
 };
diff --git a/src/core/matchers/toEqual.js b/src/core/matchers/toEqual.js
index 653541bc..e6236457 100644
--- a/src/core/matchers/toEqual.js
+++ b/src/core/matchers/toEqual.js
@@ -1,4 +1,4 @@
-getJasmineRequireObj().toEqual = function() {
+getJasmineRequireObj().toEqual = function(j$) {
 
   function toEqual(util, customEqualityTesters) {
     customEqualityTesters = customEqualityTesters || [];
@@ -6,10 +6,14 @@ getJasmineRequireObj().toEqual = function() {
     return {
       compare: function(actual, expected) {
         var result = {
-          pass: false
-        };
+            pass: false
+          },
+          diffBuilder = j$.DiffBuilder();
 
-        result.pass = util.equals(actual, expected, customEqualityTesters);
+        result.pass = util.equals(actual, expected, customEqualityTesters, diffBuilder);
+
+        // TODO: only set error message if test fails
+        result.message = diffBuilder.getMessage();
 
         return result;
       }
diff --git a/src/core/requireCore.js b/src/core/requireCore.js
index 50d07359..b82d1aa1 100644
--- a/src/core/requireCore.js
+++ b/src/core/requireCore.js
@@ -54,6 +54,9 @@ var getJasmineRequireObj = (function (jasmineGlobal) {
     j$.TreeProcessor = jRequire.TreeProcessor();
     j$.version = jRequire.version();
     j$.Order = jRequire.Order();
+    j$.DiffBuilder = jRequire.DiffBuilder(j$);
+    j$.NullDiffBuilder = jRequire.NullDiffBuilder(j$);
+    j$.ObjectPath = jRequire.ObjectPath(j$);
 
     j$.matchers = jRequire.requireMatchers(jRequire, j$);
 
diff --git a/src/core/util.js b/src/core/util.js
index 5b53bf8d..121e3746 100644
--- a/src/core/util.js
+++ b/src/core/util.js
@@ -67,5 +67,21 @@ getJasmineRequireObj().util = function() {
     return descriptor;
   };
 
+  util.objectDifference = function(obj, toRemove) {
+    var diff = {};
+
+    for (var key in obj) {
+      if (util.has(obj, key) && !util.has(toRemove, key)) {
+        diff[key] = obj[key];
+      }
+    }
+
+    return diff;
+  };
+
+  util.has = function(obj, key) {
+    return Object.prototype.hasOwnProperty.call(obj, key);
+  };
+
   return util;
 };