• @testing-library/react version: 11.2.0
• Testing Framework and version: jest-26.0.15
• DOM Environment: jsdom-16.4.0

Relevant code or config:

import { createEvent } from '@testing-library/react' test('event uses timeStamp', () => { const mockEvent = createEvent.click(document.body, { timeStamp: 1000000 }) expect(mockEvent.timeStamp).toBe(1000000) })

What you did:

• used createEvent to create an event with a manipulated timeStamp

What happened:

• the created event had a native timeStamp

Reproduction:

See test case above

Problem description:

Overwriting timeStamp is one of the documented use cases for createEvent, see https://testing-library.com/docs/dom-testing-library/api-events/#createeventeventname

Suggested solution:

As a workaround, one can use Object.defineProperty(event, 'timeStamp', { value: 1000000 });