In one of my unit test files, I have to mock several times the same service with different mocks.


    import { MyService } from &#39;../services/myservice.service&#39;;
    import { MockMyService1 } from &#39;../mocks/mockmyservice1&#39;;
    import { MockMyService2 } from &#39;../mocks/mockmyservice2&#39;;
    describe(&#39;MyComponent&#39;, () =&gt; {
    
        beforeEach(async(() =&gt; {
            TestBed.configureTestingModule({
            declarations: [
                MyComponent
            ],
            providers: [
                { provide: MyService, useClass: MockMyService1 }
            ]
            })
            .compileComponents();
        }));
    
        beforeEach(() =&gt; {
            fixture = TestBed.createComponent(MapComponent);
            mapComponent = fixture.componentInstance;
            fixture.detectChanges();
        });
    
        describe(&#39;MyFirstTest&#39;, () =&gt; {
            it(&#39;should test with my first mock&#39;, () =&gt; {
                /**
                 * Test with my first mock
                 */
            });
        });
    
        describe(&#39;MySecondTest&#39;, () =&gt; {
            // Here I would like to change { provide: MyService, useClass: MockMyService1 } to { provide: MyService, useClass: MockMyService2 }
    
            it(&#39;should test with my second mock&#39;, () =&gt; {
                /**
                 * Test with my second mock
                 */
            });
        });
    });



I see that the function [overrideProvider][1] exists, but I did not manage to use it in my test. When I use it in a &quot;it&quot;, the provider doesn&#39;t change. I didn&#39;t manage to find an example where this function is called. Could you explain me how to use it properly? Or have you an other method to do that?



  [1]: https://angular.io/api/core/testing/TestBed#overrideProvider

All Angular Providers Solutions on Gang of Coders

Total of 1 Angular Providers Solutions

How override Provider in Angular 5 for only one test?