Unexpected value '[object Object]' imported by the module 'DynamicTestModule'

I have issue with error from topic. I'm using angular 7 version. There is my test: landing.component.spec.ts

import { async, ComponentFixture, TestBed } from '@angular/core/testing';
import { LandingComponent } from './landing.component';
import { PegasPanelComponent } from '../pegas-panel/pegas-panel.component';
import { RouterTestingModule } from '@angular/router/testing';
import { TranslateModule, TranslateService } from '@ngx-translate/core';
import { TranslateServiceStub } from 'src/app/app-tests.spec';
import { routes } from '../user-access.routing';

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

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [LandingComponent, PegasPanelComponent, TranslateModule.forRoot()],
      imports: [RouterTestingModule, routes],
      providers: [{
        provide: TranslateService,
        useClass: TranslateServiceStub
      }]
    }).compileComponents();
  }));

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

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

landing.component.ts

import { Component, OnInit } from '@angular/core';
import { TranslateService } from '@ngx-translate/core';

@Component({
  selector: 'app-landing',
  templateUrl: './landing.component.html',
  styleUrls: ['./landing.component.scss']
})
export class LandingComponent implements OnInit {
  constructor(private translateService: TranslateService) { translateService.setDefaultLang('en'); }

  public ngOnInit() { }
}

And error:

HeadlessChrome 0.0.0 (Windows 10 0.0.0) LandingComponent should create FAILED
        Failed: Unexpected value '[object Object]' imported by the module 'DynamicTestModule'
        Error: Unexpected value '[object Object]' imported by the module 'DynamicTestModule'

I don't have any ideas how to fix it. Trying to add routing and move translateModule from declarations to imports (two answers i found) but this doesn't help.