This is the archived documentation for Angular v6. Please visit angular.io to see documentation for the current version of Angular.
API > @angular/core

Testability

The Testability service provides testing hooks that can be accessed from the browser and by services such as Protractor. Each bootstrapped Angular application on the page will have an instance of Testability.

      
      class Testability implements PublicTestability {
  increasePendingRequestCount(): number
  decreasePendingRequestCount(): number
  isStable(): boolean
  whenStable(doneCb: Function, timeout?: number, updateCb?: Function): void
  getPendingRequestCount(): number
  findProviders(using: any, provider: string, exactMatch: boolean): any[]
}

Methods

increasePendingRequestCount()

Increases the number of pending request
increasePendingRequestCount(): number
      
      increasePendingRequestCount(): number

Deprecated pending requests are now tracked with zones.

Parameters

There are no parameters.

Returns

number

decreasePendingRequestCount()

Decreases the number of pending request
decreasePendingRequestCount(): number
      
      decreasePendingRequestCount(): number

Deprecated pending requests are now tracked with zones

Parameters

There are no parameters.

Returns

number

isStable()

Whether an associated application is stable
isStable(): boolean
      
      isStable(): boolean

Parameters

There are no parameters.

Returns

boolean

whenStable()

Wait for the application to be stable with a timeout. If the timeout is reached before that happens, the callback receives a list of the macro tasks that were pending, otherwise null.
whenStable(doneCb: Function, timeout?: number, updateCb?: Function): void
      
      whenStable(doneCb: Function, timeout?: number, updateCb?: Function): void

Parameters

doneCb

The callback to invoke when Angular is stable or the timeout expires whichever comes first.
timeout

Optional. The maximum time to wait for Angular to become stable. If not specified, whenStable() will wait forever.

Optional. Default is undefined.
updateCb

Optional. If specified, this callback will be invoked whenever the set of pending macrotasks changes. If this callback returns true doneCb will not be invoked and no further updates will be issued.

Optional. Default is undefined.

Returns

void

getPendingRequestCount()

Get the number of pending requests
getPendingRequestCount(): number
      
      getPendingRequestCount(): number

Deprecated pending requests are now tracked with zones

Parameters

There are no parameters.

Returns

number

findProviders()

Find providers by name
findProviders(using: any, provider: string, exactMatch: boolean): any[]
      
      findProviders(using: any, provider: string, exactMatch: boolean): any[]

Parameters

using

The root element to search from
provider

The name of binding variable
exactMatch

Whether using exactMatch

Returns

any[]