MagicBuddy

What are the best practices for testing asynchronous code in Jest?

An example of an AI chatbot conversation about best practices for testing async code in Jest.

😀
You

What are the best practices for testing asynchronous code in Jest?

MagicBuddy
MagicBuddy

When testing asynchronous code in Jest, it's important to use async/await for better readability and to avoid callback hell.

😀
You

Can you give me an example of using async/await in a Jest test?

MagicBuddy
MagicBuddy

Sure! Here's a simple example:

test('fetches data successfully', async () => {
  const data = await fetchData();
  expect(data).toEqual(expectedData);
});
😀
You

What about handling errors in async tests?

MagicBuddy
MagicBuddy

You can use try/catch blocks to handle errors in async tests. Here's an example:

test('fetches data with error', async () => {
  try {
    await fetchDataWithError();
  } catch (e) {
    expect(e).toBeInstanceOf(Error);
  }
});
😀
You

Are there any specific Jest matchers for async tests?

MagicBuddy
MagicBuddy

Yes! Jest provides matchers like resolves and rejects to handle promises more elegantly. For example:

await expect(fetchData()).resolves.toEqual(expectedData);
await expect(fetchDataWithError()).rejects.toThrow(Error);
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