ng-tester

ng-tester is an Angular library designed to create structured, opionated spec files for components. It incorporates angular-unit-test-helper to assist with mocking.

Each spec file is created with two subsections:

"DOM Tests"

• Contains Angular TestBed
• Designed for tests that check state changes (i.e. fixture.detectChanges()) or require DOM access (i.e. testing UI elements)
• Runs slower than functional tests (however as of Angular v9, components are no longer recompiled for each test, significantly improving test run speed from previous Angular versions)

"Functional Tests"

• Designed for functional logic testing
• Runs faster than "DOM Tests", since the DOM is not created for these tests

Usage

1. Run npm install -D ng-tester
2. Navigate to project/directory you'd like to generate spec file
3. Run ng generate ng-tester:unit

Output

Below is the test.component.spec.ts file generated for the command ng g ng-tester:unit --name=test:

import { ComponentFixture, TestBed, async } from '@angular/core/testing'
import {
  addProperty,
  addPropertyAsBehaviorSubject,
  autoSpyObj,
  createComponentMock,
  getAllFunctions,
  getAllProperties,
  injectClass,
  injectSpy
} from 'angular-unit-test-helper'
 
import { TestComponent } from './test.component'
 
describe('TestComponent', () => {
  let component: TestComponent
  // Declare service mocks
  let fakeServiceSpy: jasmine.SpyObj<FakeService>
 
  beforeEach(() => {
    // Initialize mocked services from actual services
    fakeServiceSpy = autoSpyObj(FakeService)
  })
 
  describe('DOM Tests', () => {
    let fixture: ComponentFixture<TestComponent>
 
    beforeEach(async(() => {
      TestBed.configureTestingModule({
        declarations: [TestComponent],
        imports: [],
        providers: [
          // Inject mocked services into TestBed
          { provide: FakeService, useValue: fakeServiceSpy }
        ],
      }).compileComponents()
    }))
 
    beforeEach(() => {
      // Get injected dependencies from TestBed
      fakeServiceSpy = injectSpy(FakeService)
 
      fixture = TestBed.createComponent(TestComponent)
      component = fixture.componentInstance
    })
 
    it('should create', () => {
      fixture.detectChanges()
      expect(component).toBeTruthy()
    })
 
    it('test goes here', () => {
      // arrange
 
 
      // act
 
 
      // assert
 
    })
  })
 
  describe('Functional Tests', () => {
    beforeEach(() => {
      // Create component instance with mocked services
      component = new TestComponent(fakeServiceSpy)
    })
 
    it('test goes here', () => {
      // arrange
 
 
      // act
 
 
      // assert
 
    })
  })
})

Peer Dependencies

• @angular/common: >= 9.0.0
• @angular/core: >= 9.0.0
• angular-unit-test-helper: >= 9.3.0
• tslib: >= 1.10.0

Testing Schematic Locally

1. In ng-tester directory, run npm run package
2. Navigate to project/directory you'd like to generate spec file
3. Install .tgz file created in step 1 as a devDependency (i.e. npm i ../ng-tester/dist/ng-tester/ng-tester-9.0.0.tgz -D)
4. Run ng generate ng-tester:unit