Q192: What is TestBed? - Angular & Signals (283 Qs)

TestBed is an api for writing unit tests for Angular applications and it's libraries. Even though We still write our tests in Jasmine and run using Karma, this API provides an easier way to create components, handle injection, test asynchronous behaviour and interact with our application.

Practical Code Example

typescript

// TestBed: Primary Angular unit testing utility for configuring mocks and creating test components
import { TestBed } from '@angular/core/testing';
import { CounterComponent } from './counter.component';

describe('CounterComponent', () => {
  beforeEach(async () => {
    await TestBed.configureTestingModule({
      imports: [CounterComponent]
    }).compileComponents();
  });

  it('creates component', () => {
    const fixture = TestBed.createComponent(CounterComponent);
    expect(fixture.componentInstance).toBeTruthy();
  });
});