Your question is Unit and Integration Tests for Preprocessing. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Explain how you would structure unit tests and integration tests for a complex data preprocessing pipeline.
Describe how you would isolate deterministic transformations, validate schemas and data quality, test component boundaries, and use representative fixtures without making tests brittle. Cover test orchestration, failure diagnosis, CI execution, and monitoring for regressions in production preprocessing behavior.
