Cannot find module 'swiper_angular' on unit test (jest) after upgrading Swiper 6 to 7

Issue

I'm running into a problem on my unit tests after upgrading Swiper 6 to 7. I'm using Angular 12 and Swiper 7.3.1. Before upgrading it the unit tests were working fine (Swiper version 6.5.9).

I'm using the SwiperModule in my tests like this:

import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { ComponentFixture, TestBed, waitForAsync } from '@angular/core/testing';
import { of } from 'rxjs';
import { SwiperComponent, SwiperModule } from 'swiper/angular';

import { TeaserWrapperContainerComponent } from './teaser-wrapper-container.component';
import { InterfaceState } from '@migrosonline/shared-deps-all/core/interface/interface.store';


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

const mockedSwiperComponent = {
        swiperRef: {
            slideNext: jest.fn(),
            slidePrev: jest.fn(),
            destroy: jest.fn(),
            update: jest.fn()
        }
    } as unknown as SwiperComponent;

beforeEach(
        waitForAsync(() => {
            mockedInterfaceService.prototype.select = jest.fn();

            TestBed.configureTestingModule({
                declarations: [TeaserWrapperContainerComponent],
                imports: [SwiperModule],
                providers: [{ provide: InterfaceService, useClass: mockedInterfaceService }],
                schemas: [CUSTOM_ELEMENTS_SCHEMA]
            }).compileComponents();
        })
    );

    beforeEach(() => {
        fixture = TestBed.createComponent(TeaserWrapperContainerComponent);
        component = fixture.componentInstance;
        component.teaserGroupSliderRef = mockedSwiperComponent;
    });

    it('should create', () => {
        fixture.detectChanges();

        expect(component).toBeTruthy();
    });

});

and the error I get is this one:

Cannot find module 'swiper_angular' from 'src/lib/shared/teaser/teaser-wrapper-container/teaser-wrapper-container.component.spec.ts'

      3 | import { of } from 'rxjs';
    > 4 | import { SwiperComponent, SwiperModule } from 'swiper/angular';

I would appreciate any ideas/comments/suggestions.

Solution

In case someone else run into this issue, the problem was related to the eslint or tslint configuration for the test and it got fixed adding the swiper_angular to the compilerOptions > paths in the tsconfig.json (or the tsconfig.spec.json) file:

"compilerOptions": {
    ...
    "paths": {
      "swiper_angular": ["node_modules/swiper/angular"]
    } 
  }

I found the solution in the Swiper issues: https://github.com/nolimits4web/swiper/issues/4315

Answered By - vhbazan