Exception in unit tests with radio buttons: config.get is not a function

Hi,

I constantly get exceptions in my unit tests, if the component uses ion-radio:

ERROR: TypeError: config.get is not a function
TypeError: config.get is not a function
    at addEventListener (http://localhost:9877/_karma_webpack_/webpack:/node_modules/@ionic/core/dist/esm/helpers-dd7e4b7b.js:49:1)
    at Radio.connectedCallback (http://localhost:9877/_karma_webpack_/webpack:/node_modules/@ionic/core/dist/esm/ion-radio_2.entry.js:64:23)
    at safeCall (http://localhost:9877/_karma_webpack_/webpack:/node_modules/@ionic/core/dist/esm/index-7a8b7a1c.js:1262:1)

The strange thing is, that these exceptions occur as soon as there is more than one test in a spec.ts file, but even if these tests are empty:

describe('SampleTest', () => {
    let component: MySampleComponent;
    let fixture: ComponentFixture<MySampleComponent>;

    beforeEach(async () => {
        TestBed.configureTestingModule({
            declarations: [MySampleComponent],
            schemas: [CUSTOM_ELEMENTS_SCHEMA],
            imports: [
                CommonModule,
                FormsModule,
                ReactiveFormsModule,
                RouterModule.forRoot([], { relativeLinkResolution: 'legacy' }),
                TranslateModule.forRoot({
                    activeLang: 'en'
                }),
                RouterTestingModule.withRoutes([]),
                IonicModule.forRoot()
            ]
        }).compileComponents().catch(error => fail(error));

        fixture = TestBed.createComponent(InAppPreferencesComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });

    it('should run A', () => {
    });

    it('should run B', () => {
    });
});

If I remove the detectChanges, no error is thrown.

Any idea what’s going wrong here, or how to solve it?

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