To allow any element add ‘NO_ERRORS_SCHEMA’ to the ‘@NgModule.schemas’ of this component. in Angular 4

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In your test spec file it needs to be set up like this:

beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ yourcomponent ],
      schemas: [NO_ERRORS_SCHEMA]
    })
    .compileComponents();
  }));

Notice the schemas property in the TestBed.configureTestingModule method. After setting the schemas property your tests should run without error as before you added Font Awsome component.

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