feat(Effects): Introduce new Effects testing module

modules/effects/testing/README.md

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+@ngrx/effects/testing
+=======
+
+The sources for this package are in the main [ngrx/platform](https://github.com/ngrx/platform) repo. Please file issues and pull requests against that repo.
+
+License: MIT

modules/effects/testing/index.ts

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+export * from './src/testing';

modules/effects/testing/package.json

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+{
+  "name": "@ngrx/effects/testing",
+  "typings": "../testing.d.ts",
+  "main": "../bundles/effects-testing.umd.js",
+  "module": "../@ngrx/effects/testing.es5.js",
+  "es2015": "../@ngrx/effects/testing.js"
+}

modules/effects/testing/rollup.config.js

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+export default {
+  entry: './dist/effects/@ngrx/effects/testing.es5.js',
+  dest: './dist/effects/bundles/effects-testing.umd.js',
+  format: 'umd',
+  exports: 'named',
+  moduleName: 'ngrx.effects.testing',
+  globals: {
+    '@angular/core': 'ng.core',
+    '@ngrx/effects': 'ngrx.effects',
+    'rxjs/Observable': 'Rx',
+    'rxjs/observable/defer': 'Rx.Observable.defer',
+  }
+}

modules/effects/testing/src/testing.ts

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+import { Provider } from '@angular/core';
+import { Actions } from '@ngrx/effects';
+import { Observable } from 'rxjs/Observable';
+import { defer } from 'rxjs/observable/defer';
+
+
+export function provideMockActions(source: Observable<any>): Provider;
+export function provideMockActions(factory: () => Observable<any>): Provider;
+export function provideMockActions(factoryOrSource: (() => Observable<any>) | Observable<any>): Provider {
+  return {
+    provide: Actions,
+    useFactory: (): Observable<any> => {
+      if (typeof factoryOrSource === 'function') {
+        return defer(factoryOrSource);
+      }
+
+      return factoryOrSource;
+    },
+  };
+}

modules/effects/testing/tsconfig-build.json

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+{
+  "extends": "../tsconfig-build",
+  "compilerOptions": {
+    "paths": {
+      "@ngrx/store": ["../../dist/packages/store"],
+      "@ngrx/effects": ["../../dist/packages/effects"]
+    }
+  },
+  "files": [
+    "index.ts"
+  ],
+  "angularCompilerOptions": {
+    "strictMetadataEmit": true
+  }
+}