ComponentFixture

From Get docs
< @angular/core‎ | testingAngular/docs/10/api/core/testing/componentfixture


ComponentFixture

class

Fixture for debugging and testing a component.

class ComponentFixture<T> {
  constructor(componentRef: ComponentRef<T>, ngZone: NgZone, _autoDetect: boolean)
  debugElement: DebugElement
  componentInstance: T
  nativeElement: any
  elementRef: ElementRef
  changeDetectorRef: ChangeDetectorRef
  componentRef: ComponentRef<T>
  ngZone: NgZone | null
  detectChanges(checkNoChanges: boolean = true): void
  checkNoChanges(): void
  autoDetectChanges(autoDetect: boolean = true)
  isStable(): boolean
  whenStable(): Promise<any>
  whenRenderingDone(): Promise<any>
  destroy(): void
}

Constructor

constructor(componentRef: ComponentRef<T>, ngZone: NgZone, _autoDetect: boolean)

Parameters
componentRef ComponentRef
ngZone NgZone
_autoDetect boolean


Properties

Property Description
debugElement: DebugElement The DebugElement associated with the root element of this component.
componentInstance: T The instance of the root component class.
nativeElement: any The native element at the root of the component.
elementRef: ElementRef The ElementRef for the element at the root of the component.
changeDetectorRef: ChangeDetectorRef The ChangeDetectorRef for the component
componentRef: ComponentRef<T> Declared in Constructor
null Declared in Constructor

Methods

Trigger a change detection cycle for the component.

detectChanges(checkNoChanges: boolean = true): void

Parameters
checkNoChanges boolean Optional. Default is true.
Returns

void


Do a change detection run to make sure there were no changes.

checkNoChanges(): void

Parameters

There are no parameters.

Returns

void


Set whether the fixture should autodetect changes.

autoDetectChanges(autoDetect: boolean = true)

Parameters
autoDetect boolean Optional. Default is true.


Also runs detectChanges once so that any existing change is detected.
Return whether the fixture is currently stable or has async tasks that have not been completed yet.

isStable(): boolean

Parameters

There are no parameters.

Returns

boolean


Get a promise that resolves when the fixture is stable.

whenStable(): Promise<any>

Parameters

There are no parameters.

Returns

Promise<any>


This can be used to resume testing after events have triggered asynchronous activity or asynchronous change detection.
Get a promise that resolves when the ui state is stable following animations.

whenRenderingDone(): Promise<any>

Parameters

There are no parameters.

Returns

Promise<any>


Trigger component destruction.

destroy(): void

Parameters

There are no parameters.

Returns

void



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Licensed under the Creative Commons Attribution License 4.0.
https://v10.angular.io/api/core/testing/ComponentFixture