[Feature Request] Implement assert.rejects() and assert.doesNotReject() #272

Feature Request

Add async/Promise assertion functions to match Node.js assert API.

Missing Functions

• assert.rejects(asyncFn, error?, message?) - Awaits the asyncFn promise or, if asyncFn is a function, calls the function and awaits the returned promise. It will then check that the promise is rejected.
• assert.doesNotReject(asyncFn, error?, message?) - Awaits the asyncFn promise or, if asyncFn is a function, calls the function and awaits the returned promise. It will then check that the promise is not rejected.

Current Workarounds

// Instead of assert.rejects()
await assert.throws(async () => await asyncFn());

// Instead of assert.doesNotReject()
await assert.doesNotThrow(async () => await asyncFn());

Node.js Documentation

• assert.rejects()
• assert.doesNotReject()

Related

See migration guide: Migrating from Node.js Assert