Jest examples in angular

jest_angular_testing_examples.md

Services

example.service.spec.ts

describe('ExampleService', () => { 
  const _httpClient = new HttpClient(null); 
  const _otherService = new OtherService(null, null);

  let service: ExampleService; 
  beforeEach(() => { 
    service = new TimingBenchmarkService(_httpClient, _otherService); 
  }); 
  test('the service multiplies two numbers', () => { 
    expect(service.multiply(1, 2)).toEqual(2); 
  }); 
  test('service.produceWidgets', () => { 
    expect(service.produceWidgets(1, 60)).toEqual('60 widgets produced in 1 hour'); 
  }); 
});

Unit Tests (shallow, no Test Bed)