Add Promise checking to eq

Fixes #1314

spec/core/matchers/matchersUtilSpec.js

@@ -166,6 +166,16 @@ describe("matchersUtil", function() {
 
       expect(jasmineUnderTest.matchersUtil.equals(a,b)).toBe(true);
     });
+    
+    it("passes for equivalent Promises (GitHub issue #1314)", function() {
+      if (typeof Promise === 'undefined') { return; }
+
+      var p1 = new Promise(function () {}),
+        p2 = new Promise(function () {});
+
+      expect(jasmineUnderTest.matchersUtil.equals(p1, p1)).toBe(true);
+      expect(jasmineUnderTest.matchersUtil.equals(p1, p2)).toBe(false);
+    });
 
     describe("when running in a browser", function() {
       function isNotRunningInBrowser() {

src/core/base.js

@@ -75,6 +75,10 @@ getJasmineRequireObj().base = function(j$, jasmineGlobal) {
     return obj.nodeType > 0;
   };
 
+  j$.isPromise = function(obj) {
+    return (typeof Promise !== 'undefined') && obj.constructor === Promise;
+  };
+
   j$.fnNameFor = function(func) {
     if (func.name) {
       return func.name;

src/core/matchers/matchersUtil.js

@@ -209,6 +209,12 @@ getJasmineRequireObj().matchersUtil = function(j$) {
       diffBuilder.record(a, b);
       return false;
     }
+    
+    var aIsPromise = j$.isPromise(a);
+    var bIsPromise = j$.isPromise(b);
+    if (aIsPromise && bIsPromise) {
+      return a === b;
+    }
 
     // Assume equality for cyclic structures. The algorithm for detecting cyclic
     // structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.