I am currently utilizing angular 8 along with Jest for unit testing. My challenge lies in adding a listener for the 'transitionend' event on an element, and I'm struggling to find a way to simulate/mock this event using Jest.
this.animatedElement.nativeElement.addEventListener('transitionend', () => {
this.transitionEnded = true;
});
My objective is to write a unit test that validates this.transitionEnded as true
Here is a handy function you can use to trigger any event:
function fireCustomEvent(element) {
let customEvent = document.createEvent("Event");
customEvent.initEvent("customEvent", true, true);
element.dispatchEvent(customEvent);
}
Now, in your testing scenario, utilize this function as follows:
test("Provide a brief description here", () => {
const box = document.getElementById("box");
fireCustomEvent(box);
expect(box.classList.contains("active")).toBeFalsy();
});
I successfully found a solution that worked well for me
it('Verifying transitionEnded is set to true', () => {
// Creating a custom 'transitionend' event
const customEvent = new Event('transitionend');
const appComponentInstance = TestBed.createComponent(AppComponent).componentInstance;
// Invoking methodToAddListener function which adds an event listener to animatedElement
appComponentInstance.methodToAddListener();
// Dispatching the custom event on animatedElement
appComponentInstance.animatedElement.nativeElement.dispatchEvent(customEvent);
expect(appComponentInstance.transitionEnded).toBe(true);
});
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