How do I use Jasmine spies in Angular CLI?

How do I use Jasmine spies in Angular CLI?

You can use Jasmine spies to mock functions in your Angular tests. First, import the necessary modules and create a spy using spyOn().

Can you show me a code example?

Sure! Here's a simple example:

import { MyService } from './my.service';

describe('MyComponent', () => {
  let service: MyService;

  beforeEach(() => {
    service = new MyService();
    spyOn(service, 'myMethod').and.returnValue('mocked value');
  });

  it('should call myMethod', () => {
    service.myMethod();
    expect(service.myMethod).toHaveBeenCalled();
  });
});

What if I want to spy on a method of a component?

You can spy on a component's method in a similar way. Just use spyOn(component, 'methodName') in your test setup.