toHaveClass(..., { exact: true })'s Received/Expected output is buggy

[nstepien]

• @testing-library/jest-dom version: 5.14.1
• node version: v16.7.0
• npm (or yarn) version: 7.21.0
• @testing-library/react version: 12.0.0

Relevant code or config:

expect(document.body).toHaveClass('abc', { exact: true });

What you did:

Testing an element's exact class

What happened:

When the assertion fails, the output is garbled:

Reproduction:

See relevant code above.

Problem description:

Well it's not the expected output that's for sure.

Suggested solution:

Should work similarly to when exact: false is used:

[github-actions]

🎉 This issue has been resolved in version 5.16.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀