What are some examples of unit testing in Angular?

What are some examples of unit testing in Angular?

Unit testing in Angular typically involves using Jasmine and Karma. For example, you can test a simple component like this:

import { ComponentFixture, TestBed } from '@angular/core/testing';
import { MyComponent } from './my-component.component';

describe('MyComponent', () => {
  let component: MyComponent;
  let fixture: ComponentFixture<MyComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [ MyComponent ]
    }).compileComponents();
  });

  beforeEach(() => {
    fixture = TestBed.createComponent(MyComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});

Can you explain what Jasmine and Karma are?

Jasmine is a behavior-driven development framework for testing JavaScript code, while Karma is a test runner that allows you to execute your tests in various browsers. Together, they provide a powerful setup for unit testing Angular applications.

What are some best practices for unit testing in Angular?

Some best practices include:

1. Keep tests isolated and independent.
2. Use spies to mock dependencies.
3. Write tests that are easy to read and understand.
4. Test both the happy path and edge cases.
5. Run tests frequently to catch issues early.