KaneAI - World’s First E2E Software Testing Agent.Signup for Private Beta Join TestMu Conference

How to use MY_TOKEN_SINGLE method in ng-mocks

Best JavaScript code snippet using ng-mocks

test.spec.ts

Source: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})...

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.