feat(compiler): add `MockPipeResolver`

modules/@angular/compiler/test/pipe_resolver_mock_spec.ts

@@ -0,0 +1,39 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {beforeEach, ddescribe, describe, expect, iit, it, inject,} from '@angular/core/testing/testing_internal';
+
+import {stringify, isBlank} from '../src/facade/lang';
+import {MockPipeResolver} from '../testing';
+import {Pipe, PipeMetadata, Injector} from '@angular/core';
+
+export function main() {
+  describe('MockPipeResolver', () => {
+    var pipeResolver: MockPipeResolver;
+
+    beforeEach(inject(
+        [Injector], (injector: Injector) => { pipeResolver = new MockPipeResolver(injector); }));
+
+    describe('Pipe overriding', () => {
+      it('should fallback to the default PipeResolver when templates are not overridden', () => {
+        var pipe = pipeResolver.resolve(SomePipe);
+        expect(pipe.name).toEqual('somePipe');
+      });
+
+      it('should allow overriding the @Pipe', () => {
+        pipeResolver.setPipe(SomePipe, new PipeMetadata({name: 'someOtherName'}));
+        var pipe = pipeResolver.resolve(SomePipe);
+        expect(pipe.name).toEqual('someOtherName');
+      });
+    });
+  });
+}
+
+@Pipe({name: 'somePipe'})
+class SomePipe {
+}

modules/@angular/compiler/testing/ng_module_resolver_mock.ts

@@ -13,8 +13,7 @@ import {Map} from '../src/facade/collection';
 
 @Injectable()
 export class MockNgModuleResolver extends NgModuleResolver {
-  /** @internal */
-  _ngModules = new Map<Type, NgModuleMetadata>();
+  private _ngModules = new Map<Type, NgModuleMetadata>();
 
   constructor(private _injector: Injector) { super(); }
 

modules/@angular/compiler/testing/pipe_resolver_mock.ts

@@ -0,0 +1,45 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+import {Compiler, Injectable, Injector, PipeMetadata, Type} from '@angular/core';
+
+import {PipeResolver} from '../index';
+import {Map} from '../src/facade/collection';
+
+@Injectable()
+export class MockPipeResolver extends PipeResolver {
+  private _pipes = new Map<Type, PipeMetadata>();
+
+  constructor(private _injector: Injector) { super(); }
+
+  private get _compiler(): Compiler { return this._injector.get(Compiler); }
+
+  private _clearCacheFor(component: Type) { this._compiler.clearCacheFor(component); }
+
+  /**
+   * Overrides the {@link PipeMetadata} for a pipe.
+   */
+  setPipe(type: Type, metadata: PipeMetadata): void {
+    this._pipes.set(type, metadata);
+    this._clearCacheFor(type);
+  }
+
+  /**
+   * Returns the {@link PipeMetadata} for a pipe:
+   * - Set the {@link PipeMetadata} to the overridden view when it exists or fallback to the
+   * default
+   * `PipeResolver`, see `setPipe`.
+   */
+  resolve(type: Type, throwIfNotFound = true): PipeMetadata {
+    var metadata = this._pipes.get(type);
+    if (!metadata) {
+      metadata = super.resolve(type, throwIfNotFound);
+    }
+    return metadata;
+  }
+}