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February 12, 2018 17:35
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Example of using unroll in an async test for an Angular Component
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| import {async, ComponentFixture, fakeAsync, TestBed, tick} from '@angular/core/testing'; | |
| import {SampleService} from './sample.service'; | |
| import {BrowserAnimationsModule} from '@angular/platform-browser/animations'; | |
| import {ConfigurationService, LoggerService, PUDateTimePipe, PUDateTimePipeModule, PULoggerModule} from '@princeton/pu-csi-angular-core'; | |
| import {SampleListComponent} from './sample-list.component'; | |
| import {CommonModule} from '@angular/common'; | |
| import {BrowserModule} from '@angular/platform-browser'; | |
| import {SharedAnimationsModule} from '../shared/animations/shared-animations.module'; | |
| import {HttpClient, HttpClientModule} from '@angular/common/http'; | |
| import {Observable} from 'rxjs/Observable'; | |
| import {RouterTestingModule} from '@angular/router/testing'; | |
| import {MockConfigurationService} from '../../testing/mock-configuration.service'; | |
| import * as unroll from 'unroll'; | |
| unroll.use(it); | |
| describe('SampleListComponent', () => { | |
| let fixture: ComponentFixture<SampleListComponent>; | |
| let service: SampleService; | |
| let componentElement: any; | |
| beforeEach(async(() => { | |
| TestBed.configureTestingModule({ | |
| imports: [ | |
| CommonModule, | |
| BrowserModule, | |
| BrowserAnimationsModule, | |
| RouterTestingModule, | |
| SharedAnimationsModule, | |
| PUDateTimePipeModule, | |
| PULoggerModule.forRoot(), | |
| HttpClientModule | |
| ], | |
| declarations: [ | |
| SampleListComponent | |
| ], | |
| providers: [ | |
| {provide: ConfigurationService, useClass: MockConfigurationService, deps: [HttpClient, LoggerService]}, | |
| SampleService | |
| ] | |
| }).compileComponents(); | |
| fixture = TestBed.createComponent(SampleListComponent); | |
| service = TestBed.get(SampleService); | |
| componentElement = fixture.debugElement.nativeElement; | |
| })); | |
| it('should render title in a h3 tag', async(() => { | |
| // empty Observable, because we don't care about the data for this test | |
| spyOn(service, 'getAllSamples').and.returnValue(Observable.empty); | |
| expect(componentElement.querySelector('h3').textContent).toContain('Samples'); | |
| })); | |
| // You wouldn't actually write this test (because it essentially just tests the framework), | |
| // But this shows that the async test works with respect to the expected sequence of events | |
| it('should have no data before detectChanges, full data after', async(() => { | |
| const data = [{ | |
| id: 0, | |
| field2: 'foo2', | |
| field3: 'foo3', | |
| createDate: new Date(), | |
| createUser: 'xxx', | |
| updateDate: new Date(), | |
| updateUser: 'yyy' | |
| }, | |
| { | |
| id: 1, | |
| field2: 'xxxx', | |
| field3: 'yyyy', | |
| createDate: new Date(), | |
| createUser: 'zzzzz', | |
| updateDate: new Date(), | |
| updateUser: 'aaaa' | |
| } | |
| ]; | |
| const tableName = 'sample-table'; | |
| const rowSelector = `table[name="${tableName}"] tr`; | |
| const rowCount = () => componentElement.querySelectorAll(rowSelector).length; | |
| spyOn(service, 'getAllSamples').and.returnValue(Observable.of(data)); // mock the service call | |
| expect(rowCount()).toBe(1); // just the header row | |
| fixture.detectChanges(); // kick off ngOnInit and a change detection cycle | |
| expect(rowCount()).toBe(data.length + 1); // header row + data rows | |
| })); | |
| describe('should render samples in a table', () => { | |
| const data = [{ | |
| id: 0, | |
| field2: 'foo2', | |
| field3: 'foo3', | |
| createDate: new Date(), | |
| createUser: 'xxx', | |
| updateDate: new Date(), | |
| updateUser: 'yyy' | |
| }, | |
| { | |
| id: 1, | |
| field2: 'xxxx', | |
| field3: 'yyyy', | |
| createDate: new Date(), | |
| createUser: 'zzzzz', | |
| updateDate: new Date(), | |
| updateUser: 'aaaa' | |
| } | |
| ]; | |
| const datePipe = new PUDateTimePipe(); | |
| const tableName = 'sample-table'; | |
| const cellValue = (row, col, extra) => { | |
| const selector = `table[name="${tableName}"] tr:nth-child(${row}) td:nth-child(${col}) ${extra}`; | |
| return componentElement.querySelector(selector).textContent; | |
| } | |
| unroll(`for table ${tableName} at row #row, column #col`, (done, testArgs) => { | |
| spyOn(service, 'getAllSamples').and.returnValue(Observable.of(data)); // mock the service call | |
| fixture.detectChanges(); // kick off ngOnInit and a change detection cycle | |
| const foundValue = cellValue(testArgs['row'], testArgs['col'], testArgs['extra']); | |
| expect(foundValue).toBe(testArgs['value'].toString(), | |
| `Expected to find value ${testArgs['value']} in row ${testArgs['row']}, col ${testArgs['col']}, but found ${foundValue} instead`); | |
| done(); | |
| }, [ | |
| ['row', 'col', 'extra', 'value'], | |
| [1, 1, 'a', data[0].id.toString()], | |
| [1, 2, '', data[0].field2], | |
| [1, 3, '', data[0].field3], | |
| [1, 4, '', datePipe.transform(data[0].createDate, [])], | |
| [1, 5, '', data[0].createUser], | |
| [1, 6, '', datePipe.transform(data[0].updateDate, [])], | |
| [1, 7, '', data[0].updateUser], | |
| [2, 1, 'a', data[1].id.toString()], | |
| [2, 2, '', data[1].field2], | |
| [2, 3, '', data[1].field3], | |
| [2, 4, '', datePipe.transform(data[1].createDate, [])], | |
| [2, 5, '', data[1].createUser], | |
| [2, 6, '', datePipe.transform(data[1].updateDate, [])], | |
| [2, 7, '', data[1].updateUser] | |
| ]); | |
| }); | |
| }); |
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