Angular Unit Testing NullInjectorError: R3InjectorError

In my MainComponent I have entryComponent MatSnackBarComponent(custom component). Tests are reporting this error:

NullInjectorError: R3InjectorError(DynamicTestModule)[MatSnackBarComponent -> MatSnackBarComponent]: NullInjectorError: No provider for MatSnackBarComponent!
​

describe('MainComponent', () => {
let component: MainComponent;
let fixture: ComponentFixture<MainComponent>;
let orderService: OrderService;

const fakeMatDialogRef = jasmine.createSpyObj(['close']);

beforeEach(async(() => {
TestBed.configureTestingModule({
imports: [
FormsModule,
ReactiveFormsModule,
HttpClientTestingModule,
TranslateModule.forRoot()
],
declarations: [MainComponent],
providers: [
OrderService,
{ provide: MatDialogRef, useValue: fakeMatDialogRef },
{ provide: MAT_DIALOG_DATA, useValue: {} }
],
schemas: [CUSTOM_ELEMENTS_SCHEMA]
}).compileComponents();
}));

beforeEach(() => {
fixture = TestBed.createComponent(MainComponent);
component = fixture.componentInstance;
fixture.detectChanges();
});


What should I do to fix this problem?

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