ComponentFixture

Fixture for debugging and testing a component.

class ComponentFixture<T> {
  constructor(componentRef: ComponentRef<T>, ngZone: NgZone | null, _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 | null, _autoDetect: boolean) Parameters componentRef Type: ComponentRef. ngZone Type: NgZone | null. _autoDetect Type: 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.
ngZone: NgZone | null	Declared in constructor.

Methods

detectChanges()
Trigger a change detection cycle for the component.
detectChanges(checkNoChanges: boolean = true): void Parameters checkNoChanges Type: boolean. Optional. Default is true. Returns void

checkNoChanges()
Do a change detection run to make sure there were no changes.
checkNoChanges(): void Parameters There are no parameters. Returns void

autoDetectChanges()
Set whether the fixture should autodetect changes.
autoDetectChanges(autoDetect: boolean = true) Parameters autoDetect Type: boolean. Optional. Default is true.
Also runs detectChanges once so that any existing change is detected.

isStable()
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

whenStable()
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.

whenRenderingDone()
Get a promise that resolves when the ui state is stable following animations.
whenRenderingDone(): Promise<any> Parameters There are no parameters. Returns Promise<any>

destroy()
Trigger component destruction.
destroy(): void Parameters There are no parameters. Returns void