Tests must provide fast, meaningful, and reliable feedback on quality and business risks. These are IMO the basic quality attributes of “good” tests. Worth to mention are also the FIRST principles: Fast: Execute quickly Isolated: Have a single reason to fail Repeatable: Produce the same result when executed multiple times Self-verifying: Automatically detect whether they pass or fail Timely: Written concurrently with the code under test Those principles contribute to the above mentioned attributes.