feat(compiler): add MockPipeResolver

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;
+  }
+}