George Edwards George Edwards - 1 month ago 55
TypeScript Question

Unit Testing angular2 component with imported module

I am trying to write a test on a component which uses angular-material2, but when I add it to my testModule declarations I get:

Error: Template parse errors:
'md-card-title' is not a known element:
1. If 'md-card-title' is an Angular component, then verify that it is part of this module.
2. If 'md-card-title' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schemas' of this component to suppress this message.


Adding MaterialModule to the declarations throws `Error: Unexpected module 'MaterialModule' declared by the module


DynamicTestModule' in config/spec-bundle.js (line 24994)


This is what my spec file looks like:

beforeEach(() => TestBed.configureTestingModule({
declarations: [],
providers: [
{ provide: DataService, useValue: mockDataService },
{ provide: ActivatedRoute, useClass: MockActivatedRoute },
{ provide: Router, useValue: mockRouter },
CellViewComponent
]
}));


adding
CellViewComponent
to the declarations array causes the error to throw.

Answer

When you use the TestBed.configureTestingModule, you're create a module from scratch for the test environment. So what ever you would need in the real application for the CellViewComponent to work, you also need to configure it in the testing module.

In your case, you're missing the Material card component. In the app you probably either imported the MaterialModule or the MdCardModule into your AppModule. So you need to do the same in the testing module

beforeEach(() => TestBed.configureTestingModule({
  imports: [ MaterialModule /* or MdCardModule */ ],
  declarations: [  CellViewComponent ],
  providers: [
    { provide: DataService, useValue: mockDataService },
    { provide: ActivatedRoute, useClass: MockActivatedRoute },
    { provide: Router, useValue: mockRouter },
  ]
}));
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