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})...
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