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TestBed

class final

Configures and initializes environment for unit testing and provides methods for creating components and services in unit tests.

class TestBed {
  platform: PlatformRef
  ngModule: Type<any> | Type<any>[]
  initTestEnvironment(ngModule: Type<any> | Type<any>[], platform: PlatformRef, options?: TestEnvironmentOptions): void
  resetTestEnvironment(): void
  resetTestingModule(): TestBed
  configureCompiler(config: { providers?: any[]; useJit?: boolean; }): void
  configureTestingModule(moduleDef: TestModuleMetadata): TestBed
  compileComponents(): Promise<any>
  inject<T>(token: ProviderToken<T>, notFoundValue: undefined, options: InjectOptions & { optional?: false; }): T
  get<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): any
  runInInjectionContext<T>(fn: () => T): T
  execute(tokens: any[], fn: Function, context?: any): any
  overrideModule(ngModule: Type<any>, override: MetadataOverride<NgModule>): TestBed
  overrideComponent(component: Type<any>, override: MetadataOverride<Component>): TestBed
  overrideDirective(directive: Type<any>, override: MetadataOverride<Directive>): TestBed
  overridePipe(pipe: Type<any>, override: MetadataOverride<Pipe>): TestBed
  overrideTemplate(component: Type<any>, template: string): TestBed
  overrideProvider(token: any, provider: { useFactory: Function; deps: any[]; multi?: boolean; }): TestBed
  overrideTemplateUsingTestingModule(component: Type<any>, template: string): TestBed
  createComponent<T>(component: Type<T>): ComponentFixture<T>
}

Description

TestBed is the primary api for writing unit tests for Angular applications and libraries.

Properties

Property	Description
`platform: PlatformRef`	Read-Only
`ngModule: Type<any> \| Type<any>[]`	Read-Only

Methods

initTestEnvironment()

Initialize the environment for testing with a compiler factory, a PlatformRef, and an angular module. These are common to every test in the suite.

`initTestEnvironment(ngModule: Type<any> | Type<any>[], platform: PlatformRef, options?: TestEnvironmentOptions): void`

Parameters

`ngModule`	`Type<any> \| Type<any>[]`
`platform`	`PlatformRef`
`options`	`TestEnvironmentOptions`	Optional. Default is `undefined`.

Returns

void

This may only be called once, to set up the common providers for the current test suite on the current platform. If you absolutely need to change the providers, first use resetTestEnvironment.

Test modules and platforms for individual platforms are available from '@angular/<platform_name>/testing'.

resetTestEnvironment()
Reset the providers for the test injector.
`resetTestEnvironment(): void` Parameters There are no parameters. Returns `void`

resetTestingModule()
`resetTestingModule(): TestBed` Parameters There are no parameters. Returns `TestBed`

configureCompiler()

`configureCompiler(config: { providers?: any[]; useJit?: boolean; }): void`

Parameters

config object

Returns

void

configureTestingModule()

`configureTestingModule(moduleDef: TestModuleMetadata): TestBed`

Parameters

moduleDef TestModuleMetadata

Returns

TestBed

compileComponents()
`compileComponents(): Promise<any>` Parameters There are no parameters. Returns `Promise<any>`

inject()

4 overloads...

Show All Hide All

Overload #1

`inject<T>(token: ProviderToken<T>, notFoundValue: null, options: InjectOptions): T | null`

Parameters

`token`	`ProviderToken<T>`
`notFoundValue`	`null`
`options`	`InjectOptions`

Returns

T | null

Overload #2

`inject<T>(token: ProviderToken<T>, notFoundValue?: T, options?: InjectOptions): T`

Parameters

`token`	`ProviderToken<T>`
`notFoundValue`	`T`	Optional. Default is `undefined`.
`options`	`InjectOptions`	Optional. Default is `undefined`.

Returns

T

Overload #3

`inject<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): T`

Deprecated use object-based flags (InjectOptions) instead.

Parameters

`token`	`ProviderToken<T>`
`notFoundValue`	`T`	Optional. Default is `undefined`.
`flags`	`InjectFlags`	Optional. Default is `undefined`.

Returns

T

Overload #4

`inject<T>(token: ProviderToken<T>, notFoundValue: null, flags?: InjectFlags): T | null`

Deprecated use object-based flags (InjectOptions) instead.

Parameters

`token`	`ProviderToken<T>`
`notFoundValue`	`null`
`flags`	`InjectFlags`	Optional. Default is `undefined`.

Returns

T | null

get() Deprecated

`get<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): any`

Deprecated from v9.0.0 use TestBed.inject

Parameters

`token`	`ProviderToken<T>`
`notFoundValue`	`T`	Optional. Default is `undefined`.
`flags`	`InjectFlags`	Optional. Default is `undefined`.

Returns

any

`get(token: any, notFoundValue?: any): any`

Deprecated from v9.0.0 use TestBed.inject

Parameters

`token`	`any`
`notFoundValue`	`any`	Optional. Default is `undefined`.

Returns

any

runInInjectionContext()

Runs the given function in the EnvironmentInjector context of TestBed.

`runInInjectionContext<T>(fn: () => T): T`

Parameters

fn () => T

Returns

T

execute()

`execute(tokens: any[], fn: Function, context?: any): any`

Parameters

`tokens`	`any[]`
`fn`	`Function`
`context`	`any`	Optional. Default is `undefined`.

Returns

any

overrideModule()

`overrideModule(ngModule: Type<any>, override: MetadataOverride<NgModule>): TestBed`

Parameters

`ngModule`	`Type<any>`
`override`	`MetadataOverride<NgModule>`

Returns

TestBed

overrideComponent()

`overrideComponent(component: Type<any>, override: MetadataOverride<Component>): TestBed`

Parameters

`component`	`Type<any>`
`override`	`MetadataOverride<Component>`

Returns

TestBed

overrideDirective()

`overrideDirective(directive: Type<any>, override: MetadataOverride<Directive>): TestBed`

Parameters

`directive`	`Type<any>`
`override`	`MetadataOverride<Directive>`

Returns

TestBed

overridePipe()

`overridePipe(pipe: Type<any>, override: MetadataOverride<Pipe>): TestBed`

Parameters

`pipe`	`Type<any>`
`override`	`MetadataOverride<Pipe>`

Returns

TestBed

overrideTemplate()

`overrideTemplate(component: Type<any>, template: string): TestBed`

Parameters

`component`	`Type<any>`
`template`	`string`

Returns

TestBed

overrideProvider()

Overwrites all providers for the given token with the given provider definition.

`overrideProvider(token: any, provider: { useFactory: Function; deps: any[]; multi?: boolean; }): TestBed`

Parameters

`token`	`any`
`provider`	`object`

Returns

TestBed

`overrideProvider(token: any, provider: { useValue: any; multi?: boolean; }): TestBed`

Parameters

`token`	`any`
`provider`	`object`

Returns

TestBed

`overrideProvider(token: any, provider: { useFactory?: Function; useValue?: any; deps?: any[]; multi?: boolean; }): TestBed`

Parameters

`token`	`any`
`provider`	`object`

Returns

TestBed

overrideTemplateUsingTestingModule()

`overrideTemplateUsingTestingModule(component: Type<any>, template: string): TestBed`

Parameters

`component`	`Type<any>`
`template`	`string`

Returns

TestBed

createComponent()

`createComponent<T>(component: Type<T>): ComponentFixture<T>`

Parameters

component Type<T>

Returns

ComponentFixture<T>

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