Tips for avoiding a form reload on onSubmit during unit testing with jasmine

I'm currently working on a unit test to ensure that a user can't submit a form until all fields have been filled out. The test itself is functioning correctly and passes, but the problem arises when the default behavior of form submission causes the page to reload, resulting in an infinite loop every time the test runs.

One potential solution I considered was changing the type of the submit button from "submit" to "button," but this would break the functionality, so I'd prefer to avoid that option.

I also attempted commenting out the alert section in the TypeScript file, but unfortunately, it didn't make any difference.

it('should keep the save btn disabled until recording has been done', () => {
  spyOn(component, "onSave");
  fixture.detectChanges();
  let button = fixture.debugElement.query(By.css('#createRecording')).nativeElement;
  console.log(button);
  button.click();
  expect(component.onSave).toHaveBeenCalledTimes(0);
})
<div class="web-recording-setup-container">
  <form [formGroup]="webRecordingForm" (ngSubmit)="onSave()">
    <!-- Form Markup -->
  </form>
</div>

component.ts

onSave() {
    // Functionality Logic Here
}

Answer №1

One potential solution is to consider implementing event.PreventDefault(); within the onSubmit function.

Answer №2

I suggest improving your approach to writing unit tests.

For example, instead of directly calling button.click(), consider executing the code connected in the template. In my opinion, testing whether the binding in Angular is functioning properly may not be necessary.

it('should keep the save btn disabled until recording has been done', () => {
  spyOn(component, "onSave");
  fixture.detectChanges();
  component.initiateRecording();
  component.start();
  expect(component.onSave).toHaveBeenCalledTimes(0);
})

Furthermore, it might be beneficial to modify your expect block to verify that the submit button is actually disabled, or adjust the test description to accurately reflect what you are testing. For instance, consider changing it to something like ... "onSave should not be called if the recording is incomplete,"

Have you imported the Forms Module into your TestBed? re: https://github.com/angular/angular/issues/12757

If not, this could potentially be causing the issue you are experiencing.

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