design: add test change_detection

modules/change_detection/src/watch_group.js

@@ -48,15 +48,6 @@ export class ProtoWatchGroup {
     return watchGroup;
   }
 
-  /**
-   * Sets the context (the object) on which the change detection expressions will
-   * dereference themselves on. Since the WatchGroup can be reused the context
-   * can be re-set many times during the lifetime of the WatchGroup.
-   *
-   * @param context the new context for change dection for the curren WatchGroup
-   */
-  setContext(context) {
-  }
 }
 
 export class WatchGroup {
@@ -79,6 +70,15 @@ export class WatchGroup {
     /// IMPLEMENT
   }
 
+  /**
+   * Sets the context (the object) on which the change detection expressions will
+   * dereference themselves on. Since the WatchGroup can be reused the context
+   * can be re-set many times during the lifetime of the WatchGroup.
+   *
+   * @param context the new context for change dection for the curren WatchGroup
+   */
+  setContext(context) {
+  }
 }
 
 export class WatchGroupDispatcher {

modules/change_detection/test/change_detection_spec.js

@@ -0,0 +1,42 @@
+import {describe, it, expect} from 'test_lib/test_lib';
+import {ProtoWatchGroup, WatchGroup, WatchGroupDispatcher} from 'change_detection/watch_group';
+import {DOM} from 'facade/dom';
+
+
+export function main() {
+  describe('change_detection', function() {
+    describe('ChangeDetection', function() {
+      it('should do simple watching', function() {
+        return; // remove me after getting the test to pass.
+        var person = new Person('misko', 38);
+        var pwg = new ProtoWatchGroup();
+        pwg.watch('name', 'nameToken');
+        pwg.watch('age', 'ageToken');
+        var dispatcher = new LoggingDispatcher();
+        var wg = pwg.instantiate(dispatcher);
+        wg.setContext(person);
+        var cd = new ChangeDetection(wg);
+        cd.detectChanges();
+        expect(dispatcher.log).toEqual(['ageToken=38']);
+        dispatcher.clear();
+        cd.detectChanges();
+        expect(dispatcher.log).toEqual([]);
+        person.age=1;
+        person.name="Misko";
+        cd.detectChanges();
+        expect(dispatcher.log).toEqual(['nameToken=Misko', 'ageToken=1']);
+      });
+    });
+  });
+}
+
+class Person {
+  constructor(name:string, age:number) {
+    this.name = null;
+    this.a
+  }
+}
+
+class Dispatcher extends WatchGroupDispatcher {
+
+}