Run reduce tests only in node

test/tests/extension_test.js

@@ -979,8 +979,12 @@ describe("RSVP extensions", function() {
   });
 });
 
+
 // thanks to @wizardwerdna for the test case -> https://github.com/tildeio/rsvp.js/issues/66
-describe("using reduce to sum integers using promises", function(){
+// Only run these tests in node (phantomjs cannot handle them)
+if (typeof module !== 'undefined' && module.exports) {
+
+  describe("using reduce to sum integers using promises", function(){
     var resolve = RSVP.resolve;
 
     it("should build the promise pipeline without error", function(){
@@ -1025,4 +1029,6 @@ describe("using reduce to sum integers using promises", function(){
         done();
       });
     });
-});
+  });
+
+}