Unit test Angular with Jasmine and Karma, Error:Can't bind to 'xxx' since it isn't a known property of 'xxxxxx'.

Question

I have a problem with an unit test in angular 5 with Jasmine and Karma.

The error is: "Can't bind to 'fruits' since it isn't a known property of 'my-component2'".

The unit test code is:

src/app/components/my-component1/my-component1.component.spec.ts:

And these are the code of my components:

src/app/components/my-component1/my-component1.component.ts:

import { Component, OnInit } from '@angular/core';
import { MyService1Service} from '../../services/my-service1.service';
import {fruit} from '../../Models/fruit';

@Component({
  selector: 'my-component1',
  templateUrl: './my-component1.component.html',
  styleUrls: ['./my-component1.component.css']
})
export class MyComponent1Component implements OnInit {

  constructor(private _MyService1Service: MyService1Service) { }

  public fruit= new fruit();

  public fruits: fruit[];
  ngOnInit() {
    this._MyService1Service.getPost().subscribe(
        result => {
              console.log(result);
        },
        error => {
          console.log(<any>error);
        }
      );

    this.fruit.name = 'apple';
    this.fruits.push(this.fruit);
  }
}

src/app/components/my-component1/my-component1.component.html:

 <p>
      my-component1 works!
    </p>

    <my-component2 [fruits]=fruits></my-component2>

src/app/components/my-component2/my-component2.component.ts:

import { Component, OnInit, Input } from '@angular/core';
import {fruit} from '../../Models/fruit';

@Component({
  selector: 'my-component2',
  templateUrl: './my-component2.component.html',
  styleUrls: ['./my-component2.component.css']
})
export class MyComponent2Component implements OnInit {

  @Input() fruits: fruit[];

  constructor() { }

  ngOnInit() {
  }

}

src/app/components/my-component2/my-component2.component.html:

<p>
  my-component2 works!
</p>

It is a dummy project, can anybody help me?

Thanks :)

Answer 1

You need to add your second component when creating your testing module as that module is part of component 1. If you don't the module won't have my-component2 and the input will be invalid.

TestBed.configureTestingModule({
      declarations: [ MyComponent1Component, MyComponent2Component ],
      imports: [],
      providers: [MyService1Service, HttpClient, HttpHandler, HttpTestingController]
    })