What could be causing the primeng dialog to appear blank when conducting Jasmine tests on this Angular TypeScript application?

Having trouble testing a component due to rendering issues? Check out the code snippet below:

import {ChangeDetectionStrategy, Component, EventEmitter, Input, Output} from '@angular/core';

@Component({
    selector: 'app-help',
    changeDetection: ChangeDetectionStrategy.OnPush,
    templateUrl: './help.component.html',
    styleUrls: ['./help.component.scss']
})
export class HelpComponent {
    // Code for component properties and methods
}

This component includes a template with various elements. Here's a peek at that template:

<p-dialog>
    <!-- Various elements in the template -->
</p-dialog>

When attempting to test this component, encountered an issue with HTML not fully rendering. The HTML fragment observed during testing is shown below:

<p-dialog>
    <!-- Empty ng-if binding -->
</p-dialog>

Curious about what went wrong? Dive into the test component setup provided here:

describe('help component', () => {
    // Test component setup and specs here
});

If you're struggling with testing or rendering problems, be sure to review your component and test configurations thoroughly.

Answer №1

As per the documentation, by default the visibility is set to false (https://www.primefaces.org/primeng/showcase/#/dialog) therefore, the dialog needs to be made visible initially.

it('should be created correctly', () => {
    expect(app).toBeTruthy();
    app.showHelp = true;
    fixture.detectChanges();
    fixture.whenStable().then(() => {
    const element = fixture.nativeElement;
    console.log('element is ', element);
});

Answer №2

To add ng-mocks from an npm package or equivalent, update your TestBed configuration as shown below:

TestBed.configureTestingModule({
        declarations: [
            InfoComponent,
            MockComponent(Alert),
        ],
        schemas: [
            NO_ERRORS_SCHEMA
        ],
        imports: [
            ReactiveFormsModule,
            DropdownModule,
        ],
    });

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