Recently, I have added some tests to my project and ran npm run test and got this error:
Error: Template parse errors:
'app-component' is not a known element:
1. If 'app-component' is an Angular component, then verify that it is part of this module.
2. If 'app-component' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message. ("<div>
[ERROR ->]<app-component></app-component>
This error means that you have Non-Angular elements and trying to test them. You need to go spec.ts file (with this error ) and add CUSTOM_ELEMENTS_SCHEMA to your test module:
import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
describe('Component', () => {
let component: Component;
let fixture: ComponentFixture<Component>;
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [ Component ],
schemas: [CUSTOM_ELEMENTS_SCHEMA]
})
.compileComponents();
}));