Having issues when importing modules into tests

[Azuka]

OS: MacOs 12.3
Browser: N/A (Unit tests)

Specifically any reference to the DropdownComponent e.g. when using the c-sidebar or c-dropdown component:

import { ComponentFixture, TestBed } from '@angular/core/testing';

import { FullLayoutComponent } from './full-layout.component';
import {SidebarModule} from "@coreui/angular";

describe('Main LayoutComponent', () => {
  let component: FullLayoutComponent;
  let fixture: ComponentFixture<FullLayoutComponent>;

  beforeEach(async () => {
    await TestBed.configureTestingModule({
      declarations: [FullLayoutComponent, ],
      imports: [SidebarModule],
    }).compileComponents();
  });

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

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});

I get this error:

Test suite failed to run

    ReferenceError: Cannot access 'DropdownComponent' before initialization

      3 | import { FullLayoutComponent } from './full-layout.component';
    > 4 | import {SidebarModule} from "@coreui/angular";
        | ^
      5 |
      6 | describe('Main LayoutComponent', () => {
      7 |   let component: FullLayoutComponent;

      at Object.<anonymous> (../../node_modules/@coreui/angular/fesm2020/coreui-angular.mjs:2599:212)
      at Object.<anonymous> (src/app/layout/full-layout.component.spec.ts:5:1)
      at TestScheduler.scheduleTests (../../node_modules/@jest/core/build/TestScheduler.js:333:13)
      at runJest (../../node_modules/@jest/core/build/runJest.js:404:19)
      at _run10000 (../../node_modules/@jest/core/build/cli/index.js:320:7)
      at runCLI (../../node_modules/@jest/core/build/cli/index.js:173:3)

Is this related to the order the components are defined, or partial JIT compilation like in angular/components#23907?

[xidedix]

@Azuka

• what's your version of Angular?

[Azuka]

@Azuka

• what's your version of Angular?

@xidedix Angular 13 with Jest

[xidedix]

It seems the mentioned partial compilation output issue has been fixed with Angular 13.0.1

We are closing this as the problem is not necessarily related to CoreUI.
Maybe it comes from your jest config? See:

• Support Angular v13 thymikee/jest-preset-angular#1090
• https://github.com/thymikee/jest-preset-angular/tree/main/examples/example-app-v13

Feel free to comment or reopen if you think this is a CoreUI issue.