The Angular error message "Encountered an issue while trying to read properties of undefined, specifically 'ɵpipe'"

After updating my Angular application from V15 to V16, I encountered an error in some of my tests:

 ExampleComponent › should create component   
    TypeError: Cannot read properties of undefined (reading 'ɵpipe')

      35 |
      36 |   beforeEach(async () => {
    > 37 |     await TestBed.configureTestingModule({

Has anyone else experienced this issue before and figured out what is causing it?

Answer №1

Steps I took to resolve the issue:

  • Included the services as providers in my @NgModule
@NgModule({
imports: [],
providers: [ExampleService]
)};

  • Added the service to ExampleComponent.spec test file

      beforeEach(async () => {
        await TestBed.configureTestingModule({
          declarations: [ExampleComponent],
          imports: [
            NoopAnimationsModule,
            CommonModule
          ],
          providers: [ExampleService]
        }).compileComponents();
      });

  • Main Solution - Imported the services within the component like this:

import { ExampleService } from '../../services/Example.service';

Rather than:

import { ExampleService } from '../../services';

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