All Unit Tests Passing

The sink works perfectly! The water flows through the faucet and... straight into the floor. Classic example of unit testing in software development – each component works flawlessly in isolation, but nobody bothered to check if they actually work together. The plumbing equivalent of "it works on my machine!" Sure, your authentication module passes all tests, but did anyone check if it actually talks to the database? This is why integration testing exists, folks – because passing unit tests is the programming equivalent of participation trophies.