Error: src/app/app.component.spec.ts:26:16 - error TS2339: Property 'title' does not exist on type 'AppComponent'. in travis ci

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

import { RouterTestingModule } from '@angular/router/testing';

import { AppComponent } from './app.component';

describe('AppComponent', () => {
  
  beforeEach(async () => {
    
      await TestBed.configureTestingModule({
      imports: [
        RouterTestingModule
      ],
      declarations: [
        AppComponent
      ],
    }).compileComponents();
  });

  it('should create the app', () => {
    
    const fixture = TestBed.createComponent(AppComponent);
    
    const app = fixture.componentInstance;
    
    expect(app).toBeTruthy();
  });

  it(`should have as title 'englishmonk'`, () => {
    
    const fixture = TestBed.createComponent(AppComponent);
    
    const app = fixture.componentInstance;
    
    expect(app.title).toEqual('englishmonk');
  });

  it('should render title', () => {
    
    const fixture = TestBed.createComponent(AppComponent);
    
    fixture.detectChanges();
    
    const compiled = fixture.nativeElement;
    
    expect(compiled.querySelector('.content span').textContent).toContain('englishmonk app is running!');
  
  });
});