@angular/cdk
Version:
Angular Material Component Development Kit
96 lines • 15.1 kB
JavaScript
/**
* @license
* Copyright Google LLC 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 { __awaiter } from "tslib";
import { HarnessEnvironment } from '@angular/cdk/testing';
import { flush } from '@angular/core/testing';
import { takeWhile } from 'rxjs/operators';
import { TaskStateZoneInterceptor } from './task-state-zone-interceptor';
import { UnitTestElement } from './unit-test-element';
/** The default environment options. */
const defaultEnvironmentOptions = {
queryFn: (selector, root) => root.querySelectorAll(selector)
};
/** A `HarnessEnvironment` implementation for Angular's Testbed. */
export class TestbedHarnessEnvironment extends HarnessEnvironment {
constructor(rawRootElement, _fixture, options) {
super(rawRootElement);
this._fixture = _fixture;
/** Whether the environment has been destroyed. */
this._destroyed = false;
this._options = Object.assign(Object.assign({}, defaultEnvironmentOptions), options);
this._taskState = TaskStateZoneInterceptor.setup();
_fixture.componentRef.onDestroy(() => this._destroyed = true);
}
/** Creates a `HarnessLoader` rooted at the given fixture's root element. */
static loader(fixture, options) {
return new TestbedHarnessEnvironment(fixture.nativeElement, fixture, options);
}
/**
* Creates a `HarnessLoader` at the document root. This can be used if harnesses are
* located outside of a fixture (e.g. overlays appended to the document body).
*/
static documentRootLoader(fixture, options) {
return new TestbedHarnessEnvironment(document.body, fixture, options);
}
/**
* Creates an instance of the given harness type, using the fixture's root element as the
* harness's host element. This method should be used when creating a harness for the root element
* of a fixture, as components do not have the correct selector when they are created as the root
* of the fixture.
*/
static harnessForFixture(fixture, harnessType, options) {
return __awaiter(this, void 0, void 0, function* () {
const environment = new TestbedHarnessEnvironment(fixture.nativeElement, fixture, options);
yield environment.forceStabilize();
return environment.createComponentHarness(harnessType, fixture.nativeElement);
});
}
forceStabilize() {
return __awaiter(this, void 0, void 0, function* () {
if (this._destroyed) {
throw Error('Harness is attempting to use a fixture that has already been destroyed.');
}
this._fixture.detectChanges();
yield this._fixture.whenStable();
});
}
waitForTasksOutsideAngular() {
return __awaiter(this, void 0, void 0, function* () {
// If we run in the fake async zone, we run "flush" to run any scheduled tasks. This
// ensures that the harnesses behave inside of the FakeAsyncTestZone similar to the
// "AsyncTestZone" and the root zone (i.e. neither fakeAsync or async). Note that we
// cannot just rely on the task state observable to become stable because the state will
// never change. This is because the task queue will be only drained if the fake async
// zone is being flushed.
if (Zone.current.get('FakeAsyncTestZoneSpec')) {
flush();
}
// Wait until the task queue has been drained and the zone is stable. Note that
// we cannot rely on "fixture.whenStable" since it does not catch tasks scheduled
// outside of the Angular zone. For test harnesses, we want to ensure that the
// app is fully stabilized and therefore need to use our own zone interceptor.
yield this._taskState.pipe(takeWhile(state => !state.stable)).toPromise();
});
}
getDocumentRoot() {
return document.body;
}
createTestElement(element) {
return new UnitTestElement(element, () => this.forceStabilize());
}
createEnvironment(element) {
return new TestbedHarnessEnvironment(element, this._fixture, this._options);
}
getAllRawElements(selector) {
return __awaiter(this, void 0, void 0, function* () {
yield this.forceStabilize();
return Array.from(this._options.queryFn(selector, this.rawRootElement));
});
}
}
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This can be used if harnesses are\n   * located outside of a fixture (e.g. overlays appended to the document body).\n   */\n  static documentRootLoader(fixture: ComponentFixture<unknown>,\n      options?: TestbedHarnessEnvironmentOptions): HarnessLoader {\n    return new TestbedHarnessEnvironment(document.body, fixture, options);\n  }\n\n  /**\n   * Creates an instance of the given harness type, using the fixture's root element as the\n   * harness's host element. This method should be used when creating a harness for the root element\n   * of a fixture, as components do not have the correct selector when they are created as the root\n   * of the fixture.\n   */\n  static async harnessForFixture<T extends ComponentHarness>(\n      fixture: ComponentFixture<unknown>, harnessType: ComponentHarnessConstructor<T>,\n      options?: TestbedHarnessEnvironmentOptions): Promise<T> {\n    const environment = new TestbedHarnessEnvironment(fixture.nativeElement, fixture, options);\n    await environment.forceStabilize();\n    return environment.createComponentHarness(harnessType, fixture.nativeElement);\n  }\n\n  async forceStabilize(): Promise<void> {\n    if (this._destroyed) {\n      throw Error('Harness is attempting to use a fixture that has already been destroyed.');\n    }\n\n    this._fixture.detectChanges();\n    await this._fixture.whenStable();\n  }\n\n  async waitForTasksOutsideAngular(): Promise<void> {\n    // If we run in the fake async zone, we run \"flush\" to run any scheduled tasks. This\n    // ensures that the harnesses behave inside of the FakeAsyncTestZone similar to the\n    // \"AsyncTestZone\" and the root zone (i.e. neither fakeAsync or async). Note that we\n    // cannot just rely on the task state observable to become stable because the state will\n    // never change. This is because the task queue will be only drained if the fake async\n    // zone is being flushed.\n    if (Zone!.current.get('FakeAsyncTestZoneSpec')) {\n      flush();\n    }\n\n    // Wait until the task queue has been drained and the zone is stable. Note that\n    // we cannot rely on \"fixture.whenStable\" since it does not catch tasks scheduled\n    // outside of the Angular zone. For test harnesses, we want to ensure that the\n    // app is fully stabilized and therefore need to use our own zone interceptor.\n    await this._taskState.pipe(takeWhile(state => !state.stable)).toPromise();\n  }\n\n  protected getDocumentRoot(): Element {\n    return document.body;\n  }\n\n  protected createTestElement(element: Element): TestElement {\n    return new UnitTestElement(element, () => this.forceStabilize());\n  }\n\n  protected createEnvironment(element: Element): HarnessEnvironment<Element> {\n    return new TestbedHarnessEnvironment(element, this._fixture, this._options);\n  }\n\n  protected async getAllRawElements(selector: string): Promise<Element[]> {\n    await this.forceStabilize();\n    return Array.from(this._options.queryFn(selector, this.rawRootElement));\n  }\n}\n"]}