feat(tests): add a test injector

fixes #614

Asynchronous test should inject an AsyncTestCompleter:

Before:

  it("async test", (done) => {
    // ...
    done();
  });

After:

  it("async test", inject([AsyncTestCompleter], (async) => {
    // ...
    async.done();
  }));

Note: inject() is currently a function and the first parameter is the
array of DI tokens to inject as the test function parameters. This
construct is linked to Traceur limitations. The planned syntax is:

  it("async test", @Inject (async: AsyncTestCompleter) => {
    // ...
    async.done();
  });

modules/benchpress/test/sampler_spec.js

@@ -1,4 +1,15 @@
-import {describe, it, iit, xit, expect, beforeEach, afterEach} from 'angular2/test_lib';
+import {
+  afterEach,
+  AsyncTestCompleter,
+  beforeEach,
+  ddescribe,
+  describe,
+  expect,
+  iit,
+  inject,
+  it,
+  xit,
+} from 'angular2/test_lib';
 
 import { isBlank, isPresent, BaseException, stringify, Date, DateWrapper } from 'angular2/src/facade/lang';
 import { ListWrapper, List } from 'angular2/src/facade/collection';
@@ -58,7 +69,7 @@ export function main() {
       sampler = new Injector(bindings).get(Sampler);
     }
 
-    it('should call the prepare and execute callbacks using WebDriverAdapter.waitFor', (done) => {
+    it('should call the prepare and execute callbacks using WebDriverAdapter.waitFor', inject([AsyncTestCompleter], (async) => {
       var log = [];
       var count = 0;
       var driver = new MockDriverAdapter([], (callback) => {
@@ -79,12 +90,12 @@ export function main() {
       sampler.sample().then( (_) => {
         expect(count).toBe(4);
         expect(log).toEqual([0,1,2,3]);
-        done();
+        async.done();
       });
 
-    });
+    }));
 
-    it('should call prepare, gc, beginMeasure, execute, gc, endMeasure for every iteration', (done) => {
+    it('should call prepare, gc, beginMeasure, execute, gc, endMeasure for every iteration', inject([AsyncTestCompleter], (async) => {
       var workCount = 0;
       var log = [];
       createSampler({
@@ -115,11 +126,11 @@ export function main() {
           ['gc'],
           ['endMeasure', false, {'script': 1}],
         ]);
-        done();
+        async.done();
       });
-    });
+    }));
 
-    it('should call execute, gc, endMeasure for every iteration if there is no prepare callback', (done) => {
+    it('should call execute, gc, endMeasure for every iteration if there is no prepare callback', inject([AsyncTestCompleter], (async) => {
       var log = [];
       var workCount = 0;
       createSampler({
@@ -143,11 +154,11 @@ export function main() {
           ['gc'],
           ['endMeasure', true, {'script': 1}],
         ]);
-        done();
+        async.done();
       });
-    });
+    }));
 
-    it('should not gc if the flag is not set', (done) => {
+    it('should not gc if the flag is not set', inject([AsyncTestCompleter], (async) => {
       var log = [];
       createSampler({
         metric: createCountingMetric(),
@@ -158,11 +169,11 @@ export function main() {
       });
       sampler.sample().then( (_) => {
         expect(log).toEqual([]);
-        done();
+        async.done();
       });
-    });
+    }));
 
-    it('should only collect metrics for execute and ignore metrics from prepare', (done) => {
+    it('should only collect metrics for execute and ignore metrics from prepare', inject([AsyncTestCompleter], (async) => {
       var scriptTime = 0;
       var iterationCount = 1;
       createSampler({
@@ -184,11 +195,11 @@ export function main() {
         expect(state.completeSample.length).toBe(2);
         expect(state.completeSample[0]).toEqual(mv(0, 1000, {'script': 10}));
         expect(state.completeSample[1]).toEqual(mv(1, 1001, {'script': 20}));
-        done();
+        async.done();
       });
-    });
+    }));
 
-    it('should call the validator for every execution and store the valid sample', (done) => {
+    it('should call the validator for every execution and store the valid sample', inject([AsyncTestCompleter], (async) => {
       var log = [];
       var validSample = [{}];
 
@@ -213,11 +224,11 @@ export function main() {
           ['validate', [mv(0, 1000, {'script': 0}), mv(1, 1001, {'script': 1})], validSample]
         );
 
-        done();
+        async.done();
       });
-    });
+    }));
 
-    it('should report the metric values', (done) => {
+    it('should report the metric values', inject([AsyncTestCompleter], (async) => {
       var log = [];
       var validSample = [{}];
       createSampler({
@@ -244,9 +255,9 @@ export function main() {
           ['reportSample', [mv(0, 1000, {'script': 0}), mv(1, 1001, {'script': 1})], validSample]
         );
 
-        done();
+        async.done();
       });
-    });
+    }));
 
   });
 }
@@ -366,4 +377,4 @@ class MockReporter extends Reporter {
     ListWrapper.push(this._log, ['reportSample', completeSample, validSample]);
     return PromiseWrapper.resolve(null);
   }
-}
+}