CODEWITHSUNDEEP
angulartestingrxjs
Francois Venter
Francois Venter

Reputation: 35

Angular Pipe testing using RXJS

Is it possible to force a specific error in angular for testing purposes using RXJS?

Example:

somerequest('http://myserversomewhere/endpoint').pipe(new Error(404, 'Endpoint Not Found'));

Instead of setting up a mock server somewhere and building out the whole set of errors to test

Upvotes: 0

Views: 94

Answers (1)

Daniel Delgado
Daniel Delgado

Reputation: 5313

Yes, you can mock an error, but first you should mock your service provider. Here an example:

import { throwError } from 'rxjs';

describe('Set of tests', () => {
  beforeEach(waitForAsync(() => {
    TestBed.configureTestingModule({
      providers: [
        { provide: MyService, useClass: FakeMyService }
      ],
    }).compileComponents();
  }));

  it('My first test', () => {
    myService = TestBed.get(MyService);

    // HERE IS WHERE WE SHOULD MOCK A SERVICE' FUNCTION
    spyOn(myService, 'myServiceFunction')
      .and.returnValue(throwError(new Error(404, 'Endpoint Not Found')));
  });

});

Full example on github: here

Upvotes: 1

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