diff --git a/modules/angular2/src/testing/test_injector.ts b/modules/angular2/src/testing/test_injector.ts
index 1fac9583c7..377c2c9bd6 100644
--- a/modules/angular2/src/testing/test_injector.ts
+++ b/modules/angular2/src/testing/test_injector.ts
@@ -23,7 +23,7 @@ import {
   defaultKeyValueDiffers,
   ChangeDetectorGenConfig
 } from 'angular2/src/core/change_detection/change_detection';
-import {BaseException, ExceptionHandler} from 'angular2/src/facade/exceptions';
+import {ExceptionHandler} from 'angular2/src/facade/exceptions';
 import {PipeResolver} from 'angular2/src/core/linker/pipe_resolver';
 import {XHR} from 'angular2/src/compiler/xhr';
 
@@ -131,56 +131,14 @@ function _runtimeCompilerBindings() {
   ];
 }
 
-/**
- * Configures an injector suitable for testing.
- */
-export class TestInjector {
-  private _instantiated: boolean = false;
-
-  private _injector: Injector = null;
-
-  private _providers: Array<Type | Provider | any[]> = [];
-
-  reset() {
-    this._injector = null;
-    this._providers = [];
-    this._instantiated = false;
-  }
-
-  addProviders(providers: Array<Type | Provider | any[]>) {
-    if (this._instantiated) {
-      throw new BaseException('Cannot add providers after test injector is instantiated');
-    }
-    this._providers = ListWrapper.concat(this._providers, providers);
-  }
-
-  createInjector() {
-    var rootInjector = Injector.resolveAndCreate(_getRootProviders());
-    this._injector = rootInjector.resolveAndCreateChild(ListWrapper.concat(
-        ListWrapper.concat(_getAppBindings(), _runtimeCompilerBindings()), this._providers));
-    this._instantiated = true;
-    return this._injector;
-  }
-
-  execute(fn: FunctionWithParamTokens): any {
-    if (!this._instantiated) {
-      this.createInjector();
-    }
-    return fn.execute(this._injector);
-  }
+export function createTestInjector(providers: Array<Type | Provider | any[]>): Injector {
+  var rootInjector = Injector.resolveAndCreate(_getRootProviders());
+  return rootInjector.resolveAndCreateChild(ListWrapper.concat(_getAppBindings(), providers));
 }
 
-var _testInjector: TestInjector = null;
-
-/**
- * Retrieve the {@link TestInjector}, possibly creating one if it doesn't
- * exist yet.
- */
-export function getTestInjector() {
-  if (_testInjector == null) {
-    _testInjector = new TestInjector();
-  }
-  return _testInjector;
+export function createTestInjectorWithRuntimeCompiler(
+    providers: Array<Type | Provider | any[]>): Injector {
+  return createTestInjector(ListWrapper.concat(_runtimeCompilerBindings(), providers));
 }
 
 /**
@@ -216,17 +174,12 @@ export function inject(tokens: any[], fn: Function): FunctionWithParamTokens {
 }
 
 /**
- * Use {@link inject} instead, which now supports both synchronous and asynchronous tests.
- *
- * @deprecated
+ * @deprecated Use inject instead, which now supports both synchronous and asynchronous tests.
  */
 export function injectAsync(tokens: any[], fn: Function): FunctionWithParamTokens {
   return new FunctionWithParamTokens(tokens, fn, true);
 }
 
-/**
- * A testing function with parameters which will be injected. See {@link inject} for details.
- */
 export class FunctionWithParamTokens {
   constructor(private _tokens: any[], private _fn: Function, public isAsync: boolean) {}
 
diff --git a/modules/angular2/src/testing/testing.ts b/modules/angular2/src/testing/testing.ts
index 875016029f..f6f7f735ab 100644
--- a/modules/angular2/src/testing/testing.ts
+++ b/modules/angular2/src/testing/testing.ts
@@ -7,11 +7,10 @@ import {ListWrapper} from 'angular2/src/facade/collection';
 import {bind} from 'angular2/core';
 
 import {
+  createTestInjectorWithRuntimeCompiler,
   FunctionWithParamTokens,
   inject,
-  injectAsync,
-  TestInjector,
-  getTestInjector
+  injectAsync
 } from './test_injector';
 
 export {inject, injectAsync} from './test_injector';
@@ -93,10 +92,14 @@ var jsmIt = _global.it;
 var jsmIIt = _global.fit;
 var jsmXIt = _global.xit;
 
-var testInjector: TestInjector = getTestInjector();
+var testProviders;
+var injector;
 
 // Reset the test providers before each test.
-jsmBeforeEach(() => { testInjector.reset(); });
+jsmBeforeEach(() => {
+  testProviders = [];
+  injector = null;
+});
 
 /**
  * Allows overriding default providers of the test injector,
@@ -112,9 +115,8 @@ export function beforeEachProviders(fn): void {
   jsmBeforeEach(() => {
     var providers = fn();
     if (!providers) return;
-    try {
-      testInjector.addProviders(providers);
-    } catch (e) {
+    testProviders = [...testProviders, ...providers];
+    if (injector !== null) {
       throw new Error('beforeEachProviders was called after the injector had ' +
                       'been used in a beforeEach or it block. This invalidates the ' +
                       'test injector');
@@ -186,7 +188,11 @@ function _it(jsmFn: Function, name: string, testFn: FunctionWithParamTokens | An
 
   if (testFn instanceof FunctionWithParamTokens) {
     jsmFn(name, (done) => {
-      var returnedTestValue = runInTestZone(() => testInjector.execute(testFn), done, done.fail);
+      if (!injector) {
+        injector = createTestInjectorWithRuntimeCompiler(testProviders);
+      }
+
+      var returnedTestValue = runInTestZone(() => testFn.execute(injector), done, done.fail);
       if (_isPromiseLike(returnedTestValue)) {
         (<Promise<any>>returnedTestValue).then(null, (err) => { done.fail(err); });
       }
@@ -215,7 +221,13 @@ export function beforeEach(fn: FunctionWithParamTokens | AnyTestFn): void {
     // The test case uses inject(). ie `beforeEach(inject([ClassA], (a) => { ...
     // }));`
 
-    jsmBeforeEach((done) => { runInTestZone(() => testInjector.execute(fn), done, done.fail); });
+    jsmBeforeEach((done) => {
+      if (!injector) {
+        injector = createTestInjectorWithRuntimeCompiler(testProviders);
+      }
+
+      runInTestZone(() => fn.execute(injector), done, done.fail);
+    });
   } else {
     // The test case doesn't use inject(). ie `beforeEach((done) => { ... }));`
     if ((<any>fn).length === 0) {
diff --git a/modules/angular2/src/testing/testing_internal.dart b/modules/angular2/src/testing/testing_internal.dart
index 821300b742..0bc0f6d5a2 100644
--- a/modules/angular2/src/testing/testing_internal.dart
+++ b/modules/angular2/src/testing/testing_internal.dart
@@ -21,23 +21,20 @@ import 'package:angular2/src/core/reflection/reflection.dart';
 import 'package:angular2/src/core/reflection/reflection_capabilities.dart';
 
 import 'package:angular2/src/core/di/provider.dart' show bind;
+import 'package:angular2/src/core/di/injector.dart' show Injector;
 import 'package:angular2/src/facade/collection.dart' show StringMapWrapper;
 
 import 'test_injector.dart';
 export 'test_injector.dart' show inject;
 
-TestInjector _testInjector = getTestInjector();
+List _testBindings = [];
+Injector _injector;
 bool _isCurrentTestAsync;
-Future _currentTestFuture;
 bool _inIt = false;
 
 class AsyncTestCompleter {
   final _completer = new Completer();
 
-  AsyncTestCompleter() {
-    _currentTestFuture = this.future;
-  }
-
   void done() {
     _completer.complete();
   }
@@ -53,11 +50,10 @@ void testSetup() {
   // - Priority 1: create the test injector to be used in beforeEach() and it()
 
   gns.beforeEach(() {
-    _testInjector.reset();
-    _currentTestFuture = null;
+    _testBindings.clear();
   }, priority: 3);
 
-  var completerProvider = bind(AsyncTestCompleter).toFactory(() {
+  var completerBinding = bind(AsyncTestCompleter).toFactory(() {
     // Mark the test as async when an AsyncTestCompleter is injected in an it(),
     if (!_inIt) throw 'AsyncTestCompleter can only be injected in an "it()"';
     _isCurrentTestAsync = true;
@@ -66,14 +62,15 @@ void testSetup() {
 
   gns.beforeEach(() {
     _isCurrentTestAsync = false;
-    _testInjector.addProviders([completerProvider]);
+    _testBindings.add(completerBinding);
+    _injector = createTestInjectorWithRuntimeCompiler(_testBindings);
   }, priority: 1);
 }
 
 /**
- * Allows overriding default providers defined in test_injector.js.
+ * Allows overriding default bindings defined in test_injector.js.
  *
- * The given function must return a list of DI providers.
+ * The given function must return a list of DI bindings.
  *
  * Example:
  *
@@ -84,8 +81,8 @@ void testSetup() {
  */
 void beforeEachProviders(Function fn) {
   gns.beforeEach(() {
-    var providers = fn();
-    if (providers != null) _testInjector.addProviders(providers);
+    var bindings = fn();
+    if (bindings != null) _testBindings.addAll(bindings);
   }, priority: 2);
 }
 
@@ -98,7 +95,7 @@ void beforeEach(fn) {
   if (fn is! FunctionWithParamTokens) fn =
       new FunctionWithParamTokens([], fn, false);
   gns.beforeEach(() {
-    _testInjector.execute(fn);
+    fn.execute(_injector);
   });
 }
 
@@ -107,9 +104,9 @@ void _it(gnsFn, name, fn) {
       new FunctionWithParamTokens([], fn, false);
   gnsFn(name, () {
     _inIt = true;
-    _testInjector.execute(fn);
+    fn.execute(_injector);
     _inIt = false;
-    if (_isCurrentTestAsync) return _currentTestFuture;
+    if (_isCurrentTestAsync) return _injector.get(AsyncTestCompleter).future;
   });
 }
 
diff --git a/modules/angular2/src/testing/testing_internal.ts b/modules/angular2/src/testing/testing_internal.ts
index 72ca9ebb10..86ac1e380e 100644
--- a/modules/angular2/src/testing/testing_internal.ts
+++ b/modules/angular2/src/testing/testing_internal.ts
@@ -5,7 +5,11 @@ import {NgZoneZone} from 'angular2/src/core/zone/ng_zone';
 
 import {provide} from 'angular2/core';
 
-import {TestInjector, getTestInjector, FunctionWithParamTokens, inject} from './test_injector';
+import {
+  createTestInjectorWithRuntimeCompiler,
+  FunctionWithParamTokens,
+  inject
+} from './test_injector';
 import {browserDetection} from './utils';
 
 export {inject} from './test_injector';
@@ -44,7 +48,7 @@ var inIt = false;
 jasmine.DEFAULT_TIMEOUT_INTERVAL = 500;
 var globalTimeOut = browserDetection.isSlow ? 3000 : jasmine.DEFAULT_TIMEOUT_INTERVAL;
 
-var testInjector = getTestInjector();
+var testProviders;
 
 /**
  * Mechanism to run `beforeEach()` functions of Angular tests.
@@ -58,17 +62,16 @@ class BeforeEachRunner {
 
   beforeEach(fn: FunctionWithParamTokens | SyncTestFn): void { this._fns.push(fn); }
 
-  run(): void {
-    if (this._parent) this._parent.run();
+  run(injector): void {
+    if (this._parent) this._parent.run(injector);
     this._fns.forEach((fn) => {
-      return isFunction(fn) ? (<SyncTestFn>fn)() :
-                              (testInjector.execute(<FunctionWithParamTokens>fn));
+      return isFunction(fn) ? (<SyncTestFn>fn)() : (<FunctionWithParamTokens>fn).execute(injector);
     });
   }
 }
 
 // Reset the test providers before each test
-jsmBeforeEach(() => { testInjector.reset(); });
+jsmBeforeEach(() => { testProviders = []; });
 
 function _describe(jsmFn, ...args) {
   var parentRunner = runnerStack.length === 0 ? null : runnerStack[runnerStack.length - 1];
@@ -117,7 +120,7 @@ export function beforeEachProviders(fn): void {
   jsmBeforeEach(() => {
     var providers = fn();
     if (!providers) return;
-    testInjector.addProviders(providers);
+    testProviders = [...testProviders, ...providers];
   });
 }
 
@@ -147,17 +150,18 @@ function _it(jsmFn: Function, name: string, testFn: FunctionWithParamTokens | An
           }
         });
 
-        testInjector.addProviders([completerProvider]);
-        runner.run();
+        var injector = createTestInjectorWithRuntimeCompiler([...testProviders, completerProvider]);
+        runner.run(injector);
 
         inIt = true;
-        testInjector.execute(testFn);
+        testFn.execute(injector);
         inIt = false;
       }, timeOut);
     } else {
       jsmFn(name, () => {
-        runner.run();
-        testInjector.execute(testFn);
+        var injector = createTestInjectorWithRuntimeCompiler(testProviders);
+        runner.run(injector);
+        testFn.execute(injector);
       }, timeOut);
     }
 
@@ -166,12 +170,14 @@ function _it(jsmFn: Function, name: string, testFn: FunctionWithParamTokens | An
 
     if ((<any>testFn).length === 0) {
       jsmFn(name, () => {
-        runner.run();
+        var injector = createTestInjectorWithRuntimeCompiler(testProviders);
+        runner.run(injector);
         (<SyncTestFn>testFn)();
       }, timeOut);
     } else {
       jsmFn(name, (done) => {
-        runner.run();
+        var injector = createTestInjectorWithRuntimeCompiler(testProviders);
+        runner.run(injector);
         (<AsyncTestFn>testFn)(done);
       }, timeOut);
     }
diff --git a/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart b/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart
index 857b948b0b..43494c9e6a 100644
--- a/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart
+++ b/modules/angular2/test/web_workers/debug_tools/multi_client_server_message_bus.server.spec.dart
@@ -11,6 +11,7 @@ import "package:angular2/testing_internal.dart"
         iit,
         expect,
         beforeEach,
+        createTestInjector,
         beforeEachProviders,
         SpyObject,
         proxy;
diff --git a/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart b/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart
index 50ca5f15ae..0cf86f781b 100644
--- a/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart
+++ b/modules/angular2/test/web_workers/debug_tools/single_client_server_message_bus.server.spec.dart
@@ -10,6 +10,7 @@ import "package:angular2/testing_internal.dart"
         it,
         expect,
         beforeEach,
+        createTestInjector,
         beforeEachProviders,
         SpyObject,
         proxy;
diff --git a/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart b/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart
index 9b87a3e281..6823eb008a 100644
--- a/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart
+++ b/modules/angular2/test/web_workers/debug_tools/web_socket_message_bus_spec.dart
@@ -8,6 +8,7 @@ import "package:angular2/testing_internal.dart"
         it,
         expect,
         beforeEach,
+        createTestInjector,
         beforeEachProviders,
         SpyObject,
         proxy;
diff --git a/modules/angular2/test/web_workers/shared/message_bus_spec.ts b/modules/angular2/test/web_workers/shared/message_bus_spec.ts
index 1e3073c94e..e4fcc2ade0 100644
--- a/modules/angular2/test/web_workers/shared/message_bus_spec.ts
+++ b/modules/angular2/test/web_workers/shared/message_bus_spec.ts
@@ -5,6 +5,7 @@ import {
   it,
   expect,
   beforeEach,
+  createTestInjectorWithRuntimeCompiler,
   beforeEachProviders,
   SpyObject,
   proxy
diff --git a/modules/angular2/test/web_workers/shared/service_message_broker_spec.ts b/modules/angular2/test/web_workers/shared/service_message_broker_spec.ts
index d30be8bc59..9b0b148221 100644
--- a/modules/angular2/test/web_workers/shared/service_message_broker_spec.ts
+++ b/modules/angular2/test/web_workers/shared/service_message_broker_spec.ts
@@ -5,6 +5,7 @@ import {
   it,
   expect,
   beforeEach,
+  createTestInjectorWithRuntimeCompiler,
   beforeEachProviders,
   SpyObject,
   proxy
diff --git a/modules/angular2/test/web_workers/worker/event_dispatcher_spec.ts b/modules/angular2/test/web_workers/worker/event_dispatcher_spec.ts
index a97d1b0096..5efa1ea811 100644
--- a/modules/angular2/test/web_workers/worker/event_dispatcher_spec.ts
+++ b/modules/angular2/test/web_workers/worker/event_dispatcher_spec.ts
@@ -5,6 +5,7 @@ import {
   it,
   expect,
   beforeEach,
+  createTestInjectorWithRuntimeCompiler,
   beforeEachProviders,
   SpyObject,
   proxy
diff --git a/modules/angular2/test/web_workers/worker/renderer_integration_spec.ts b/modules/angular2/test/web_workers/worker/renderer_integration_spec.ts
index 8f56648945..dbeca90582 100644
--- a/modules/angular2/test/web_workers/worker/renderer_integration_spec.ts
+++ b/modules/angular2/test/web_workers/worker/renderer_integration_spec.ts
@@ -7,8 +7,8 @@ import {
   iit,
   expect,
   beforeEach,
+  createTestInjectorWithRuntimeCompiler,
   beforeEachProviders,
-  TestInjector,
   TestComponentBuilder
 } from "angular2/testing_internal";
 import {DOM} from 'angular2/src/platform/dom/dom_adapter';
@@ -102,14 +102,12 @@ export function main() {
     beforeEachProviders(() => {
       var uiRenderProtoViewStore = new RenderProtoViewRefStore(false);
       uiRenderViewStore = new RenderViewWithFragmentsStore(false);
-      var testInjector = new TestInjector();
-      testInjector.addProviders([
+      uiInjector = createTestInjectorWithRuntimeCompiler([
         provide(RenderProtoViewRefStore, {useValue: uiRenderProtoViewStore}),
         provide(RenderViewWithFragmentsStore, {useValue: uiRenderViewStore}),
         provide(DomRenderer, {useClass: DomRenderer_}),
         provide(Renderer, {useExisting: DomRenderer})
       ]);
-      uiInjector = testInjector.createInjector();
       var uiSerializer = uiInjector.get(Serializer);
       var domRenderer = uiInjector.get(DomRenderer);
       var workerRenderProtoViewStore = new RenderProtoViewRefStore(true);
diff --git a/modules/angular2/test/web_workers/worker/xhr_impl_spec.ts b/modules/angular2/test/web_workers/worker/xhr_impl_spec.ts
index dfb68279af..83fe0f9828 100644
--- a/modules/angular2/test/web_workers/worker/xhr_impl_spec.ts
+++ b/modules/angular2/test/web_workers/worker/xhr_impl_spec.ts
@@ -5,6 +5,7 @@ import {
   it,
   expect,
   beforeEach,
+  createTestInjectorWithRuntimeCompiler,
   beforeEachProviders
 } from 'angular2/testing_internal';
 import {SpyMessageBroker} from './spies';
diff --git a/modules_dart/angular2_testing/lib/angular2_testing.dart b/modules_dart/angular2_testing/lib/angular2_testing.dart
index da737b3863..60d1302dd3 100644
--- a/modules_dart/angular2_testing/lib/angular2_testing.dart
+++ b/modules_dart/angular2_testing/lib/angular2_testing.dart
@@ -1,8 +1,11 @@
 library angular2_testing.angular2_testing;
 
 import 'package:test/test.dart';
+import 'package:test/src/backend/invoker.dart';
+import 'package:test/src/backend/live_test.dart';
 
 import 'package:angular2/angular2.dart';
+import 'package:angular2/src/core/di/injector.dart' show Injector;
 import 'package:angular2/src/core/di/metadata.dart' show InjectMetadata;
 import 'package:angular2/src/core/di/exceptions.dart' show NoAnnotationError;
 import 'package:angular2/platform/browser_static.dart' show BrowserDomAdapter;
@@ -28,13 +31,6 @@ void initAngularTests() {
   reflector.reflectionCapabilities = new ReflectionCapabilities();
 }
 
-void _addTestInjectorTearDown() {
-  // Multiple resets are harmless.
-  tearDown(() {
-    _testInjector.reset();
-  });
-}
-
 /// Allows overriding default bindings defined in test_injector.dart.
 ///
 /// The given function must return a list of DI providers.
@@ -49,17 +45,13 @@ void _addTestInjectorTearDown() {
 /// ```
 void setUpProviders(Iterable<Provider> providerFactory()) {
   setUp(() {
-    try {
-      _testInjector.addProviders(providerFactory());
-    } catch(e) {
+    if (_currentInjector != null) {
       throw 'setUpProviders was called after the injector had '
           'been used in a setUp or test block. This invalidates the '
           'test injector';
     }
-
+    _currentTestProviders.addAll(providerFactory());
   });
-
-  _addTestInjectorTearDown();
 }
 
 dynamic _runInjectableFunction(Function fn) {
@@ -80,8 +72,11 @@ dynamic _runInjectableFunction(Function fn) {
     tokens.add(token);
   }
 
+  if (_currentInjector == null) {
+    _currentInjector = createTestInjectorWithRuntimeCompiler(_currentTestProviders);
+  }
   var injectFn = new FunctionWithParamTokens(tokens, fn, false);
-  return _testInjector.execute(injectFn);
+  return injectFn.execute(_currentInjector);
 }
 
 /// Use the test injector to get bindings and run a function.
@@ -97,8 +92,6 @@ void ngSetUp(Function fn) {
   setUp(() async {
     await _runInjectableFunction(fn);
   });
-
-  _addTestInjectorTearDown();
 }
 
 /// Add a test which can use the test injector.
@@ -115,8 +108,25 @@ void ngTest(String description, Function fn,
   test(description, () async {
     await _runInjectableFunction(fn);
   }, testOn: testOn, timeout: timeout, skip: skip, onPlatform: onPlatform);
-
-  _addTestInjectorTearDown();
 }
 
-final TestInjector _testInjector = getTestInjector();
+final _providersExpando =
+    new Expando<List<Provider>>('Providers for the current test');
+final _injectorExpando =
+    new Expando<Injector>('Angular Injector for the current test');
+
+List get _currentTestProviders {
+  if (_providersExpando[_currentTest] == null) {
+    return _providersExpando[_currentTest] = [];
+  }
+  return _providersExpando[_currentTest];
+}
+
+Injector get _currentInjector => _injectorExpando[_currentTest];
+void set _currentInjector(Injector newInjector) {
+  _injectorExpando[_currentTest] = newInjector;
+}
+
+// TODO: warning, the Invoker.current.liveTest is not a settled API and is
+// subject to change in future versions of package:test.
+LiveTest get _currentTest => Invoker.current.liveTest;