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How to use MY_TOKEN_SINGLE method in ng-mocks

Best JavaScript code snippet using ng-mocks

test.spec.ts

1import { VERSION } from '@angular/core';2import { MockBuilder, MockRender, ngMocks } from 'ng-mocks';3import {4  MY_TOKEN_MULTI,5  MY_TOKEN_SINGLE,6  TargetComponent,7  TargetModule,8} from './fixtures';9// Because all tokens have factories the test should render them correctly.10// There is no way to specify multi in a factory, so we do not get an array.11describe('module-with-factory-tokens:real', () => {12  if (Number.parseInt(VERSION.major, 10) <= 5) {13    it('a5', () => {14      // pending('Need Angular > 5');15      expect(true).toBeTruthy();16    });17    return;18  }19  beforeEach(() =>20    MockBuilder()21      .keep(TargetModule)22      .keep(MY_TOKEN_SINGLE)23      .keep(MY_TOKEN_MULTI),24  );25  it('renders all tokens', () => {26    const fixture = MockRender(TargetComponent);27    expect(fixture.nativeElement.innerHTML).toEqual(28      '<internal-component>"MY_TOKEN_SINGLE" "MY_TOKEN_MULTI"</internal-component>',29    );30  });31});32// Because all tokens are kept the test should render them correctly.33// There is no way to specify multi in a factory, so we do not get an array.34describe('module-with-factory-tokens:keep', () => {35  if (Number.parseInt(VERSION.major, 10) <= 5) {36    it('a5', () => {37      // pending('Need Angular > 5');38      expect(true).toBeTruthy();39    });40    return;41  }42  beforeEach(() =>43    MockBuilder(44      [TargetComponent, MY_TOKEN_SINGLE, MY_TOKEN_MULTI],45      TargetModule,46    ),47  );48  it('renders all tokens', () => {49    const fixture = MockRender(TargetComponent);50    expect(fixture.nativeElement.innerHTML).toEqual(51      '<internal-component>"MY_TOKEN_SINGLE" "MY_TOKEN_MULTI"</internal-component>',52    );53  });54});55// Preferred way.56// Because tokens are provided in the testbed module with custom values the test should render them.57describe('module-with-factory-tokens:mock-0', () => {58  beforeEach(() =>59    MockBuilder(TargetComponent, TargetModule)60      .provide({61        provide: MY_TOKEN_SINGLE,62        useValue: 'V1',63      })64      .provide({65        multi: true,66        provide: MY_TOKEN_MULTI,67        useValue: 'V2',68      }),69  );70  it('fails to render all tokens', () => {71    const fixture = MockRender(TargetComponent);72    expect(ngMocks.formatHtml(fixture)).toContain('"V1" [ "V2" ]');73  });74});75// Because all tokens are replaced with mock copies in the module the test should render empty values.76// The tokens will be added to provides with undefined values.77// Result of the render is an empty string because there is no way to pass multi.78describe('module-with-factory-tokens:mock-1', () => {79  beforeEach(() =>80    MockBuilder(TargetComponent, [81      TargetModule,82      MY_TOKEN_SINGLE,83      MY_TOKEN_MULTI,84    ]),85  );86  it('renders all tokens', () => {87    const fixture = MockRender(TargetComponent);88    expect(ngMocks.formatHtml(fixture)).toEqual(89      '<internal-component></internal-component>',90    );91  });92});93// Because all tokens are replaced with mock copies with custom values the test should render them.94// There is no way to specify multi in a factory, so we do not get an array.95describe('module-with-factory-tokens:mock-2', () => {96  beforeEach(() =>97    MockBuilder(TargetComponent, TargetModule)98      .mock(MY_TOKEN_SINGLE, 'MOCK_MY_TOKEN_SINGLE', { export: true })99      .mock(MY_TOKEN_MULTI, 'MOCK_MY_TOKEN_MULTI', { export: true }),100  );101  it('renders all tokens', () => {102    const fixture = MockRender(TargetComponent);103    expect(fixture.nativeElement.innerHTML).toEqual(104      '<internal-component>"MOCK_MY_TOKEN_SINGLE" "MOCK_MY_TOKEN_MULTI"</internal-component>',105    );106  });107});108// And the most interesting case. Because we do not touch tokens at all and mock the module109// the tokens will used as they are with their factories.110// Unfortunately, it is quite tough to guess which tokens we can keep, mocks or omit and now111// a user is responsible to specify tokens for his mock.112// UPD 2020-10-28: it has been fixed. Now all missed tokens are added to the TestModuleMeta,113// therefore we have to keep them.114describe('module-with-factory-tokens:mock-3', () => {115  if (Number.parseInt(VERSION.major, 10) <= 5) {116    it('a5', () => {117      // pending('Need Angular > 5');118      expect(true).toBeTruthy();119    });120    return;121  }122  beforeEach(() =>123    MockBuilder(124      [TargetComponent, MY_TOKEN_SINGLE, MY_TOKEN_MULTI],125      TargetModule,126    ),127  );128  it('renders all tokens', () => {129    const fixture = MockRender(TargetComponent);130    expect(fixture.nativeElement.innerHTML).toEqual(131      '<internal-component>"MY_TOKEN_SINGLE" "MY_TOKEN_MULTI"</internal-component>',132    );133  });...

fixtures.ts

Source: fixtures.ts

1import { CommonModule } from '@angular/common';2import { Component, Inject, InjectionToken, NgModule } from '@angular/core';3export const MY_TOKEN_SINGLE = new InjectionToken('MY_TOKEN_SINGLE');4export const MY_TOKEN_MULTI = new InjectionToken('MY_TOKEN_MULTI');5@Component({6  selector: 'internal-component',7  template: '{{ tokenSingle | json }} {{ tokenMulti | json }}',8})9export class TargetComponent {10  public constructor(11    @Inject(MY_TOKEN_SINGLE) public readonly tokenSingle: string,12    @Inject(MY_TOKEN_MULTI) public readonly tokenMulti: string[],13  ) {}14}15@NgModule({16  declarations: [TargetComponent],17  exports: [TargetComponent],18  imports: [CommonModule],19  providers: [20    {21      provide: MY_TOKEN_SINGLE,22      useValue: 'MY_TOKEN_SINGLE',23    },24    {25      multi: true,26      provide: MY_TOKEN_MULTI,27      useValue: 'MY_TOKEN_MULTI',28    },29    {30      multi: true,31      provide: MY_TOKEN_MULTI,32      useValue: 'MY_TOKEN_MULTI_2',33    },34  ],35})...

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