Looking for advice on creating Jasmine unit test cases for a method that opens a custom type dialog in my component.
export class OpenPopUpComponent implements OnInit {
constructor(public dialog:NewCustomDialog) {}
ngOnInit() {
}
openModel(){
this.dialog.open(NewComponent,<NewCustomDialogConfig>{
size: 'double',
data: {
title: 'New Dialog'
}
});
}
}
When writing unit tests, it's important to focus on mocking dependencies rather than testing the actual dialog itself. In this case, you can mock the NewCustomDialog and inject it into your test.
In your spec.ts file
beforeEach(() => {
const spy = jasmine.createSpyObj('NewCustomDialog', ['open']);
TestBed.configureTestingModule({
// Provide (spy) dependency
providers: [
{ provide: NewCustomDialog, useValue: {newCustomDialogSpy} }
]
});
// Inject both the service-to-test and its (spy) dependency
masterService = TestBed.get(MasterService);
valueServiceSpy = TestBed.get(ValueService);
});
You can then verify that the spy has been called with the expected parameters during the test execution.
Unit testing is crucial for testing the functionality of a component in isolation, without delving into features that fall outside the scope of that component. For example, there's no need to test the dialog.open method separately when it can be covered within the unit tests of NewCustomDialog.
NewCustomDialog:export class NewCustomDialogStub{
open(){ return null; }
close(){ return null; }
// and other dummy methods required by "OpenPopUpComponent"
}
stub using useClass in the providers array as shown:describe('OpenPopUpComponent', () => {
let component: OpenPopUpComponent;
let fixture: ComponentFixture<OpenPopUpComponent>;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [],
declarations: [OpenPopUpComponent],
providers: [
{ provide: NewCustomDialog, useClass: NewCustomDialogStub }
]
}).compileComponents();
});
beforeEach(() => {
fixture = TestBed.createComponent(OpenPopUpComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});
it('should be defined',()=>{
expect(component).toBeDefined();
})
it('should call the "open" method of dialog when calling openModel()',()=>{
spyOn(component.dialog,'open').and.callThrough();
component.openModel();
expect(component.dialog.open).toHaveBeenCalled();
})
})
This serves as a fundamental approach to testing. If you wish to learn more about writing tests, feel free to visit this series of informative articles. You can also refer to this specific article for further insights.
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