@angular/core
Version:
Angular - the core framework
199 lines • 25.2 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 { ApplicationRef, getDebugNode, inject, NgZone, RendererFactory2, ɵEffectScheduler as EffectScheduler, ɵgetDeferBlocks as getDeferBlocks, ɵNoopNgZone as NoopNgZone } from '@angular/core';
import { Subscription } from 'rxjs';
import { DeferBlockFixture } from './defer';
import { ComponentFixtureAutoDetect, ComponentFixtureNoNgZone } from './test_bed_common';
/**
* Fixture for debugging and testing a component.
*
* @publicApi
*/
export class ComponentFixture {
/** @nodoc */
constructor(componentRef) {
this.componentRef = componentRef;
this._isStable = true;
this._isDestroyed = false;
this._resolve = null;
this._promise = null;
this.noZoneOptionIsSet = inject(ComponentFixtureNoNgZone, { optional: true });
this._ngZone = this.noZoneOptionIsSet ? new NoopNgZone() : inject(NgZone);
this._autoDetect = inject(ComponentFixtureAutoDetect, { optional: true }) ?? false;
this.effectRunner = inject(EffectScheduler);
this._subscriptions = new Subscription();
// Inject ApplicationRef to ensure NgZone stableness causes after render hooks to run
// This will likely happen as a result of fixture.detectChanges because it calls ngZone.run
// This is a crazy way of doing things but hey, it's the world we live in.
// The zoneless scheduler should instead do this more imperatively by attaching
// the `ComponentRef` to `ApplicationRef` and calling `appRef.tick` as the `detectChanges`
// behavior.
this.appRef = inject(ApplicationRef);
// TODO(atscott): Remove this from public API
this.ngZone = this.noZoneOptionIsSet ? null : this._ngZone;
this.changeDetectorRef = componentRef.changeDetectorRef;
this.elementRef = componentRef.location;
this.debugElement = getDebugNode(this.elementRef.nativeElement);
this.componentInstance = componentRef.instance;
this.nativeElement = this.elementRef.nativeElement;
this.componentRef = componentRef;
this.setupNgZone();
}
setupNgZone() {
// Create subscriptions outside the NgZone so that the callbacks run outside
// of NgZone.
this._ngZone.runOutsideAngular(() => {
this._subscriptions.add(this._ngZone.onUnstable.subscribe({
next: () => {
this._isStable = false;
}
}));
this._subscriptions.add(this._ngZone.onMicrotaskEmpty.subscribe({
next: () => {
if (this._autoDetect) {
// Do a change detection run with checkNoChanges set to true to check
// there are no changes on the second run.
this.detectChanges(true);
}
}
}));
this._subscriptions.add(this._ngZone.onStable.subscribe({
next: () => {
this._isStable = true;
// Check whether there is a pending whenStable() completer to resolve.
if (this._promise !== null) {
// If so check whether there are no pending macrotasks before resolving.
// Do this check in the next tick so that ngZone gets a chance to update the state of
// pending macrotasks.
queueMicrotask(() => {
if (!this._ngZone.hasPendingMacrotasks) {
if (this._promise !== null) {
this._resolve(true);
this._resolve = null;
this._promise = null;
}
}
});
}
}
}));
this._subscriptions.add(this._ngZone.onError.subscribe({
next: (error) => {
throw error;
}
}));
});
}
_tick(checkNoChanges) {
this.changeDetectorRef.detectChanges();
if (checkNoChanges) {
this.checkNoChanges();
}
}
/**
* Trigger a change detection cycle for the component.
*/
detectChanges(checkNoChanges = true) {
this.effectRunner.flush();
// Run the change detection inside the NgZone so that any async tasks as part of the change
// detection are captured by the zone and can be waited for in isStable.
this._ngZone.run(() => {
this._tick(checkNoChanges);
});
// Run any effects that were created/dirtied during change detection. Such effects might become
// dirty in response to input signals changing.
this.effectRunner.flush();
}
/**
* Do a change detection run to make sure there were no changes.
*/
checkNoChanges() {
this.changeDetectorRef.checkNoChanges();
}
/**
* Set whether the fixture should autodetect changes.
*
* Also runs detectChanges once so that any existing change is detected.
*/
autoDetectChanges(autoDetect = true) {
if (this.noZoneOptionIsSet) {
throw new Error('Cannot call autoDetectChanges when ComponentFixtureNoNgZone is set');
}
this._autoDetect = autoDetect;
this.detectChanges();
}
/**
* Return whether the fixture is currently stable or has async tasks that have not been completed
* yet.
*/
isStable() {
return this._isStable && !this._ngZone.hasPendingMacrotasks;
}
/**
* Get a promise that resolves when the fixture is stable.
*
* This can be used to resume testing after events have triggered asynchronous activity or
* asynchronous change detection.
*/
whenStable() {
if (this.isStable()) {
return Promise.resolve(false);
}
else if (this._promise !== null) {
return this._promise;
}
else {
this._promise = new Promise(res => {
this._resolve = res;
});
return this._promise;
}
}
/**
* Retrieves all defer block fixtures in the component fixture.
*
* @developerPreview
*/
getDeferBlocks() {
const deferBlocks = [];
const lView = this.componentRef.hostView['_lView'];
getDeferBlocks(lView, deferBlocks);
const deferBlockFixtures = [];
for (const block of deferBlocks) {
deferBlockFixtures.push(new DeferBlockFixture(block, this));
}
return Promise.resolve(deferBlockFixtures);
}
_getRenderer() {
if (this._renderer === undefined) {
this._renderer = this.componentRef.injector.get(RendererFactory2, null);
}
return this._renderer;
}
/**
* Get a promise that resolves when the ui state is stable following animations.
*/
whenRenderingDone() {
const renderer = this._getRenderer();
if (renderer && renderer.whenRenderingDone) {
return renderer.whenRenderingDone();
}
return this.whenStable();
}
/**
* Trigger component destruction.
*/
destroy() {
if (!this._isDestroyed) {
this.componentRef.destroy();
this._subscriptions.unsubscribe();
this._isDestroyed = true;
}
}
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ApplicationRef, ChangeDetectorRef, ComponentRef, DebugElement, ElementRef, getDebugNode, inject, NgZone, RendererFactory2, ɵDeferBlockDetails as DeferBlockDetails, ɵEffectScheduler as EffectScheduler, ɵgetDeferBlocks as getDeferBlocks, ɵNoopNgZone as NoopNgZone} from '@angular/core';\nimport {Subscription} from 'rxjs';\n\nimport {DeferBlockFixture} from './defer';\nimport {ComponentFixtureAutoDetect, ComponentFixtureNoNgZone} from './test_bed_common';\n\n\n/**\n * Fixture for debugging and testing a component.\n *\n * @publicApi\n */\nexport class ComponentFixture<T> {\n  /**\n   * The DebugElement associated with the root element of this component.\n   */\n  debugElement: DebugElement;\n\n  /**\n   * The instance of the root component class.\n   */\n  componentInstance: T;\n\n  /**\n   * The native element at the root of the component.\n   */\n  nativeElement: any;\n\n  /**\n   * The ElementRef for the element at the root of the component.\n   */\n  elementRef: ElementRef;\n\n  /**\n   * The ChangeDetectorRef for the component\n   */\n  changeDetectorRef: ChangeDetectorRef;\n\n  private _renderer: RendererFactory2|null|undefined;\n  private _isStable: boolean = true;\n  private _isDestroyed: boolean = false;\n  private _resolve: ((result: boolean) => void)|null = null;\n  private _promise: Promise<boolean>|null = null;\n  private readonly noZoneOptionIsSet = inject(ComponentFixtureNoNgZone, {optional: true});\n  private _ngZone: NgZone = this.noZoneOptionIsSet ? new NoopNgZone() : inject(NgZone);\n  private _autoDetect = inject(ComponentFixtureAutoDetect, {optional: true}) ?? false;\n  private effectRunner = inject(EffectScheduler);\n  private _subscriptions = new Subscription();\n  // Inject ApplicationRef to ensure NgZone stableness causes after render hooks to run\n  // This will likely happen as a result of fixture.detectChanges because it calls ngZone.run\n  // This is a crazy way of doing things but hey, it's the world we live in.\n  // The zoneless scheduler should instead do this more imperatively by attaching\n  // the `ComponentRef` to `ApplicationRef` and calling `appRef.tick` as the `detectChanges`\n  // behavior.\n  private appRef = inject(ApplicationRef);\n\n  // TODO(atscott): Remove this from public API\n  public ngZone = this.noZoneOptionIsSet ? null : this._ngZone;\n\n  /** @nodoc */\n  constructor(public componentRef: ComponentRef<T>) {\n    this.changeDetectorRef = componentRef.changeDetectorRef;\n    this.elementRef = componentRef.location;\n    this.debugElement = <DebugElement>getDebugNode(this.elementRef.nativeElement);\n    this.componentInstance = componentRef.instance;\n    this.nativeElement = this.elementRef.nativeElement;\n    this.componentRef = componentRef;\n    this.setupNgZone();\n  }\n\n  private setupNgZone() {\n    // Create subscriptions outside the NgZone so that the callbacks run outside\n    // of NgZone.\n    this._ngZone.runOutsideAngular(() => {\n      this._subscriptions.add(this._ngZone.onUnstable.subscribe({\n        next: () => {\n          this._isStable = false;\n        }\n      }));\n      this._subscriptions.add(this._ngZone.onMicrotaskEmpty.subscribe({\n        next: () => {\n          if (this._autoDetect) {\n            // Do a change detection run with checkNoChanges set to true to check\n            // there are no changes on the second run.\n            this.detectChanges(true);\n          }\n        }\n      }));\n      this._subscriptions.add(this._ngZone.onStable.subscribe({\n        next: () => {\n          this._isStable = true;\n          // Check whether there is a pending whenStable() completer to resolve.\n          if (this._promise !== null) {\n            // If so check whether there are no pending macrotasks before resolving.\n            // Do this check in the next tick so that ngZone gets a chance to update the state of\n            // pending macrotasks.\n            queueMicrotask(() => {\n              if (!this._ngZone.hasPendingMacrotasks) {\n                if (this._promise !== null) {\n                  this._resolve!(true);\n                  this._resolve = null;\n                  this._promise = null;\n                }\n              }\n            });\n          }\n        }\n      }));\n\n      this._subscriptions.add(this._ngZone.onError.subscribe({\n        next: (error: any) => {\n          throw error;\n        }\n      }));\n    });\n  }\n\n  private _tick(checkNoChanges: boolean) {\n    this.changeDetectorRef.detectChanges();\n    if (checkNoChanges) {\n      this.checkNoChanges();\n    }\n  }\n\n  /**\n   * Trigger a change detection cycle for the component.\n   */\n  detectChanges(checkNoChanges: boolean = true): void {\n    this.effectRunner.flush();\n    // Run the change detection inside the NgZone so that any async tasks as part of the change\n    // detection are captured by the zone and can be waited for in isStable.\n    this._ngZone.run(() => {\n      this._tick(checkNoChanges);\n    });\n    // Run any effects that were created/dirtied during change detection. Such effects might become\n    // dirty in response to input signals changing.\n    this.effectRunner.flush();\n  }\n\n  /**\n   * Do a change detection run to make sure there were no changes.\n   */\n  checkNoChanges(): void {\n    this.changeDetectorRef.checkNoChanges();\n  }\n\n  /**\n   * Set whether the fixture should autodetect changes.\n   *\n   * Also runs detectChanges once so that any existing change is detected.\n   */\n  autoDetectChanges(autoDetect: boolean = true) {\n    if (this.noZoneOptionIsSet) {\n      throw new Error('Cannot call autoDetectChanges when ComponentFixtureNoNgZone is set');\n    }\n    this._autoDetect = autoDetect;\n    this.detectChanges();\n  }\n\n  /**\n   * Return whether the fixture is currently stable or has async tasks that have not been completed\n   * yet.\n   */\n  isStable(): boolean {\n    return this._isStable && !this._ngZone.hasPendingMacrotasks;\n  }\n\n  /**\n   * Get a promise that resolves when the fixture is stable.\n   *\n   * This can be used to resume testing after events have triggered asynchronous activity or\n   * asynchronous change detection.\n   */\n  whenStable(): Promise<any> {\n    if (this.isStable()) {\n      return Promise.resolve(false);\n    } else if (this._promise !== null) {\n      return this._promise;\n    } else {\n      this._promise = new Promise(res => {\n        this._resolve = res;\n      });\n      return this._promise;\n    }\n  }\n\n  /**\n   * Retrieves all defer block fixtures in the component fixture.\n   *\n   * @developerPreview\n   */\n  getDeferBlocks(): Promise<DeferBlockFixture[]> {\n    const deferBlocks: DeferBlockDetails[] = [];\n    const lView = (this.componentRef.hostView as any)['_lView'];\n    getDeferBlocks(lView, deferBlocks);\n\n    const deferBlockFixtures = [];\n    for (const block of deferBlocks) {\n      deferBlockFixtures.push(new DeferBlockFixture(block, this));\n    }\n\n    return Promise.resolve(deferBlockFixtures);\n  }\n\n\n  private _getRenderer() {\n    if (this._renderer === undefined) {\n      this._renderer = this.componentRef.injector.get(RendererFactory2, null);\n    }\n    return this._renderer as RendererFactory2 | null;\n  }\n\n  /**\n   * Get a promise that resolves when the ui state is stable following animations.\n   */\n  whenRenderingDone(): Promise<any> {\n    const renderer = this._getRenderer();\n    if (renderer && renderer.whenRenderingDone) {\n      return renderer.whenRenderingDone();\n    }\n    return this.whenStable();\n  }\n\n  /**\n   * Trigger component destruction.\n   */\n  destroy(): void {\n    if (!this._isDestroyed) {\n      this.componentRef.destroy();\n      this._subscriptions.unsubscribe();\n      this._isDestroyed = true;\n    }\n  }\n}\n"]}