Testing - Can't resolve all parameters for (ClassName)

Question

Context

I created an ApiService class to be able to handle our custom API queries, while using our own serializer + other features.

ApiSer

Answer 1

[JEST and ANGULAR]

Also, the problem may occur when you use an external module and you do not import it but use it on your service.

Ex:

import { TestBed } from '@angular/core/testing';
import  from '@ngx-translate/core';

import { SettingsService } from '../../../app/core/services/settings/settings.service';


describe('SettingsService', () => {
  let service: SettingsService;

  beforeAll(() => {
    TestBed.configureTestingModule({
      providers: [
        SettingsService,
        
      ]
    });
    service = TestBed.inject(SettingsService);
  });

  it('should be created', () => {
    expect(service).toBeTruthy();
  });

});

Errors will get you nowhere ... But, if you do that this way:

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

import { TranslateModule } from '@ngx-translate/core';

import { SettingsService } from '../../../app/core/services/settings/settings.service';


describe('SettingsService', () => {
  let service: SettingsService;

  beforeAll(() => {
    TestBed.configureTestingModule({
      imports: [TranslateModule.forRoot()], <---
      providers: [
        SettingsService
      ]
    });
    service = TestBed.inject(SettingsService);
  });

  it('should be created', () => {
    expect(service).toBeTruthy();
  });

});

Problem disappears.