Added a jasmine.exactly asymmetric equality tester

lib/jasmine-core/jasmine.js

@@ -113,6 +113,7 @@ var getJasmineRequireObj = (function(jasmineGlobal) {
     j$.Falsy = jRequire.Falsy(j$);
     j$.Empty = jRequire.Empty(j$);
     j$.NotEmpty = jRequire.NotEmpty(j$);
+    j$.Exactly = jRequire.Exactly(j$);
 
     j$.matchers = jRequire.requireMatchers(jRequire, j$);
     j$.asyncMatchers = jRequire.requireAsyncMatchers(jRequire, j$);
@@ -453,6 +454,18 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     return new j$.Empty();
   };
 
+  /**
+   * Get an {@link AsymmetricEqualityTester}, usable in any {@link matchers|matcher}
+   * that passes if the actual value is the same as the sample as determined
+   * by the `===` operator.
+   * @name jasmine.exactly
+   * @function
+   * @param {Object} sample - The value to compare the actual to.
+   */
+  j$.exactly = function(sample) {
+    return new j$.Exactly(sample);
+  };
+
   /**
    * Get an {@link AsymmetricEqualityTester}, usable in any {@link matchers|matcher} that uses Jasmine's equality (e.g. {@link matchers#toEqual|toEqual}, {@link matchers#toContain|toContain}, or {@link matchers#toHaveBeenCalledWith|toHaveBeenCalledWith}),
    * that will succeed if the actual value being compared is not empty.
@@ -2800,6 +2813,24 @@ getJasmineRequireObj().Empty = function(j$) {
   return Empty;
 };
 
+getJasmineRequireObj().Exactly = function(j$) {
+  class Exactly {
+    constructor(expected) {
+      this.expected_ = expected;
+    }
+
+    asymmetricMatch(actual) {
+      return actual === this.expected_;
+    }
+
+    jasmineToString(pp) {
+      return `<jasmine.exactly(${pp(this.expected_)})>`;
+    }
+  }
+
+  return Exactly;
+};
+
 getJasmineRequireObj().Falsy = function(j$) {
   function Falsy() {}
 

spec/core/SuiteSpec.js

@@ -71,20 +71,9 @@ describe('Suite', function() {
     suite.beforeAll(outerBefore);
     suite.beforeAll(innerBefore);
 
-    function sameInstance(expected) {
-      return {
-        asymmetricMatch: function(actual) {
-          return actual === expected;
-        },
-        jasmineToString: function() {
-          return `<same instance as ${expected}>`;
-        }
-      };
-    }
-
     expect(suite.beforeAllFns).toEqual([
-      { fn: outerBefore.fn, type: 'beforeAll', suite: sameInstance(suite) },
-      { fn: innerBefore.fn, type: 'beforeAll', suite: sameInstance(suite) }
+      { fn: outerBefore.fn, type: 'beforeAll', suite: jasmine.exactly(suite) },
+      { fn: innerBefore.fn, type: 'beforeAll', suite: jasmine.exactly(suite) }
     ]);
   });
 

spec/core/asymmetric_equality/ExactlySpec.js

@@ -0,0 +1,30 @@
+describe('Exactly', function() {
+  it('passes for primitives that are ===', function() {
+    const exactly = new jasmineUnderTest.Exactly(17);
+    expect(exactly.asymmetricMatch(17)).toBeTrue();
+  });
+
+  it('fails for primitives that are not ===', function() {
+    const exactly = new jasmineUnderTest.Exactly(42);
+    expect(exactly.asymmetricMatch('42')).toBeFalse();
+  });
+
+  it('passes for the same object instance', function() {
+    const obj = {};
+    const exactly = new jasmineUnderTest.Exactly(obj);
+    expect(exactly.asymmetricMatch(obj)).toBeTrue();
+  });
+
+  it('fails for different object instances, even if they are deep value equal', function() {
+    const exactly = new jasmineUnderTest.Exactly({});
+    expect(exactly.asymmetricMatch({})).toBeFalse();
+  });
+
+  it('describes itself for use in diffs and pretty printing', function() {
+    const exactly = new jasmineUnderTest.Exactly({ foo: ['bar'] });
+    const pp = jasmineUnderTest.basicPrettyPrinter_;
+    expect(exactly.jasmineToString(pp)).toEqual(
+      "<jasmine.exactly(Object({ foo: [ 'bar' ] }))>"
+    );
+  });
+});

src/core/asymmetric_equality/Exactly.js

@@ -0,0 +1,17 @@
+getJasmineRequireObj().Exactly = function(j$) {
+  class Exactly {
+    constructor(expected) {
+      this.expected_ = expected;
+    }
+
+    asymmetricMatch(actual) {
+      return actual === this.expected_;
+    }
+
+    jasmineToString(pp) {
+      return `<jasmine.exactly(${pp(this.expected_)})>`;
+    }
+  }
+
+  return Exactly;
+};

src/core/base.js

@@ -283,6 +283,18 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     return new j$.Empty();
   };
 
+  /**
+   * Get an {@link AsymmetricEqualityTester}, usable in any {@link matchers|matcher}
+   * that passes if the actual value is the same as the sample as determined
+   * by the `===` operator.
+   * @name jasmine.exactly
+   * @function
+   * @param {Object} sample - The value to compare the actual to.
+   */
+  j$.exactly = function(sample) {
+    return new j$.Exactly(sample);
+  };
+
   /**
    * Get an {@link AsymmetricEqualityTester}, usable in any {@link matchers|matcher} that uses Jasmine's equality (e.g. {@link matchers#toEqual|toEqual}, {@link matchers#toContain|toContain}, or {@link matchers#toHaveBeenCalledWith|toHaveBeenCalledWith}),
    * that will succeed if the actual value being compared is not empty.

src/core/requireCore.js

@@ -91,6 +91,7 @@ var getJasmineRequireObj = (function(jasmineGlobal) {
     j$.Falsy = jRequire.Falsy(j$);
     j$.Empty = jRequire.Empty(j$);
     j$.NotEmpty = jRequire.NotEmpty(j$);
+    j$.Exactly = jRequire.Exactly(j$);
 
     j$.matchers = jRequire.requireMatchers(jRequire, j$);
     j$.asyncMatchers = jRequire.requireAsyncMatchers(jRequire, j$);