What are some examples of async testing in JavaScript?

What are some examples of async testing in JavaScript?

Async testing in JavaScript often involves using libraries like Mocha or Jest. For example, you can test a promise with Jest like this: test('async test', async () => { const data = await fetchData(); expect(data).toBe('expectedValue'); });

Can you explain how to test async functions with Mocha?

Certainly! In Mocha, you can use the done callback or return a promise. For example: it('should return data', function(done) { fetchData().then(data => { expect(data).to.equal('expectedValue'); done(); }); }); Alternatively, you can return the promise directly.

What about using async/await in tests?

Using async/await makes your tests cleaner. You can write: it('should return data', async () => { const data = await fetchData(); expect(data).to.equal('expectedValue'); }); This way, you avoid the callback hell.