Verify that an exception is thrown using Mocha / Chai and async/await

Question

I\'m struggling to work out the best way to verify that a promise is rejected in a Mocha test while using async/await.

Here\'s an example that works, but I dislike t

Answer 1

This example only works with Node!

When you use Mocha on Node.js you can use doesNotReject() or rejects() both require a function that returns a promise.

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Example for when it should reject:

await rejects(testFunction());

see: https://nodejs.org/api/assert.html#assert_assert_rejects_asyncfn_error_message

Example for when it should not reject:

await doesNotReject(testFunction());

see: https://nodejs.org/api/assert.html#assert_assert_doesnotreject_asyncfn_error_message