refactor(ChangeDetection): convert change detection tests to typescript

modules/angular2/test/change_detection/change_detection_spec.ts

@@ -0,0 +1,34 @@
+import {ddescribe, describe, it, iit, xit, expect, beforeEach, afterEach} from 'angular2/test_lib';
+
+import {
+  PreGeneratedChangeDetection,
+  ChangeDetectorDefinition,
+  ProtoChangeDetector,
+  DynamicProtoChangeDetector
+} from 'angular2/change_detection';
+
+class DummyChangeDetector extends ProtoChangeDetector {}
+
+export function main() {
+  describe("PreGeneratedChangeDetection", () => {
+    var proto;
+    var def;
+
+    beforeEach(() => {
+      proto = new DummyChangeDetector();
+      def = new ChangeDetectorDefinition('id', null, [], [], []);
+    });
+
+    it("should return a proto change detector when one is available", () => {
+      var map = {'id': (registry) => proto};
+      var cd = new PreGeneratedChangeDetection(null, map);
+
+      expect(cd.createProtoChangeDetector(def)).toBe(proto)
+    });
+
+    it("should delegate to dynamic change detection otherwise", () => {
+      var cd = new PreGeneratedChangeDetection(null, {});
+      expect(cd.createProtoChangeDetector(def)).toBeAnInstanceOf(DynamicProtoChangeDetector);
+    });
+  });
+}