Contract Testing Explained: Benefits, Types, and Best Practices

Matthewallen31 Jul, 2026Technology

A team renames one field in an API. Their tests pass. Another team's application calls that API. Their tests pass too. Then the application breaks in production because both teams tested in isolation. This happens when services fall out of sync. The API changes, but the applications that depend on it aren't updated. Traditional unit tests don't catch it because each team only verifies its own code.