I am writing an Angular 2 unit test. I have a @ViewChild subcomponent that I need to recognize after the component initializes. In this case it's a Timepicker component from the ng2-bootstrap library, though the specifics shouldn't matter. After I detectChanges() the subcomponent instance is still undefined.
Pseudo-code:
@Component({
template: `
<form>
<timepicker
#timepickerChild
[(ngModel)]="myDate">
</timepicker>
</form>
`
})
export class ExampleComponent implements OnInit {
@ViewChild('timepickerChild') timepickerChild: TimepickerComponent;
public myDate = new Date();
}
// Spec
describe('Example Test', () => {
let exampleComponent: ExampleComponent;
let fixture: ComponentFixture<ExampleComponent>;
beforeEach(() => {
TestBed.configureTestingModel({
// ... whatever needs to be configured
});
fixture = TestBed.createComponent(ExampleComponent);
});
it('should recognize a timepicker'. async(() => {
fixture.detectChanges();
const timepickerChild: Timepicker = fixture.componentInstance.timepickerChild;
console.log('timepickerChild', timepickerChild)
}));
});
The pseudo-code works as expected until you reach the console log. The timepickerChild is undefined. Why is this happening?
I think it should work. Maybe you forgot to import some module in your configuration. Here is the complete code for test:
import { TestBed, ComponentFixture, async } from '@angular/core/testing';
import { Component, DebugElement } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { ExampleComponent } from './test.component';
import { TimepickerModule, TimepickerComponent } from 'ng2-bootstrap/ng2-bootstrap';
describe('Example Test', () => {
let exampleComponent: ExampleComponent;
let fixture: ComponentFixture<ExampleComponent>;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [FormsModule, TimepickerModule.forRoot()],
declarations: [
ExampleComponent
]
});
fixture = TestBed.createComponent(ExampleComponent);
});
it('should recognize a timepicker', async(() => {
fixture.detectChanges();
const timepickerChild: TimepickerComponent = fixture.componentInstance.timepickerChild;
console.log('timepickerChild', timepickerChild);
expect(timepickerChild).toBeDefined();
}));
});
Make sure your child component does not have a *ngIf that is evaluating to false. If so, it will result in the child component as being undefined.
In most cases just add it to declaration and you are good to go.
beforeEach(async(() => {
TestBed
.configureTestingModule({
imports: [],
declarations: [TimepickerComponent],
providers: [],
})
.compileComponents()