I have an input HTML File field
<input type="file" class="custom-file-input" id="question-file-upload"
formControlName="image" (change)="handleFileSelect($event)">
I want to unit test handleFileSelect function. But I don't know how to
trigger the onChange method of the <input..>. Following is the spec I have
written but I get error imageInputNE.onchange is not a function
fit('should keep track of image counter when an image is loaded', () => {
let newPracticeQuestionComponent = component;
expect(newPracticeQuestionComponent.currentImageAttachmentCount).toBe(0);
let imageInputDE =
fixture.debugElement.query(By.css("#question-file-upload"));
expect(imageInputDE).toBeTruthy();
spyOn(newPracticeQuestionComponent,'handleFileSelect');
let imageInputNE:HTMLElement = imageInputDE.nativeElement as HTMLElement;
imageInputNE.onchange(new Event("some event"));
expect(newPracticeQuestionComponent.handleFileSelect).toHaveBeenCalled();
});
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