foo.spec.ts

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

@Component({
  selector: 'foo',
  template: 'hello {{ nameCopy }}'
})
class FooComponent implements OnInit {
  @Input() name: string;
  nameCopy: string;
  ngOnInit() {
    this.nameCopy = this.name.toUpperCase();
  }
}

fdescribe('FooComponent', () => {
  let component: FooComponent;
  let fixture: ComponentFixture<FooComponent>;

  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [ FooComponent ]
    });

    fixture = TestBed.createComponent(FooComponent);
    component = fixture.componentInstance;
    component.name = 'test';
    fixture.detectChanges();
  });

  it('should display hello TEST', () => {
    expect(fixture.nativeElement.textContent).toContain('hello TEST');
  });

});