Angular 2 unit testing - @ViewChild is undefined
Unit TestingAngularAngular2 TemplateNg2 BootstrapUnit Testing Problem Overview
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?
Unit Testing Solutions
Solution 1 - Unit Testing
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();
}));
});
Solution 2 - Unit Testing
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.
Solution 3 - Unit Testing
In most cases just add it to declaration and you are good to go.
beforeEach(async(() => {
TestBed
.configureTestingModule({
imports: [],
declarations: [TimepickerComponent],
providers: [],
})
.compileComponents()
Solution 4 - Unit Testing
If you want to test the main component with a stub child component, you need to add a provider to the stub child component; as explained in the article Angular Unit Testing @ViewChild.
import { Component } from '@angular/core';
import { ChildComponent } from './child.component';
@Component({
selector: 'app-child',
template: '',
providers: [
{
provide: ChildComponent,
useClass: ChildStubComponent
}
]
})
export class ChildStubComponent {
updateTimeStamp() {}
}
Note the providers metadata, to use the class ChildStubComponent when ChildComponent is required.
You can then create your parent component normally, its child will be created with the type ChildStubComponent.
Solution 5 - Unit Testing
For an alternative way of doing this refer this post:
Solution 6 - Unit Testing
Even after following everything from the accepted answer, you are getting undefined instance of child component then kindly check if that component is visible.
In my case, there was *ngIf
applied on the control that's why instance of child was undefined then I removed and checked and it worked for me