Writing Integration Tests

Test containers provide isolated service instances: 1) Create disposable instances of databases, caches, etc., 2) Ensure test isolation and reproducibility, 3) Provide real service implementations for testing, 4) Enable testing with actual service versions, 5) Support clean test environment for each run, 6) Allow testing against multiple service versions, 7) Facilitate testing of service dependencies, 8) Enable consistent testing environments across different platforms.