ngMocks.defaultMock

Sets default values for mocks in the whole testing environment.

• ngMocks.defaultMock( Service, (instance, injector) => overrides ) - adds an override for a class
• ngMocks.defaultMock( TOKEN, (value, injector) => value ) - adds an override for a token
• ngMocks.defaultMock( Component ) - removes overrides
• ngMocks.defaultMock( TOKEN ) - removes overrides

The best place to do that is in src/test.ts for jasmine or in src/setup-jest.ts / src/test-setup.ts for jest.

For example, if a service or component has a property that should be an Observable. Then, we can configure it to be an EMPTY stream in the whole test suite.

declare class MyComponent {
  public url: string;
  public stream$: Observable<void>;
  public getStream(): Observable<void>;
}

src/test.ts

// the returned object will be applied to the component instance.
ngMocks.defaultMock(MyComponent, () => ({
  stream$: EMPTY,
  getStream: () => EMPTY,
}));

// manual override.
ngMocks.defaultMock(MyComponent, instance => {
  instance.stream$ = EMPTY;
});

// overriding tokens.
ngMocks.defaultMock(MY_TOKEN, () => 'DEFAULT_VALUE');

// url will be 'DEFAULT_VALUE'.
ngMocks.defaultMock(MyComponent, (_, injector) => ({
  url: injector.get(MY_TOKEN),
}));

// removing all overrides.
ngMocks.defaultMock(MyComponent);