#1015 use isNumber fuction to check for empty expected argument. This will allow 0 to be passed in.

src/core/matchers/toHaveBeenCalledTimes.js

@@ -0,0 +1,30 @@
+getJasmineRequireObj().toHaveBeenCalledTimes = function(j$) {
+
+  function toHaveBeenCalledTimes() {
+    return {
+      compare: function(actual, expected) {
+        if (!j$.isSpy(actual)) {
+          throw new Error('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('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;
+};