Unit Test Smells

Issues in test code.

Table of Contents

• Fragile Test: Fails due to unrelated changes.
• Obscure Test: Hard to understand verification logic.
• Test Logic in Production: Production code contains if (testing) hooks.
• Assertion Roulette: Multiple assertions without messages.
• Slow Tests: Slow tests won’t be run.
• Mystery Guest: Test relies on external resources not visible in test.
• General Fixture: Setup is too big/general for the specific test case.
• Eager Test: Checking too much functionality in one test.