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Data pipelines are notoriously hard to test. The data changes, external systems are unreliable, and transformations can be complex. But untested pipelines break silently — producing wrong data that spreads downstream before anyone notices. This lesson covers testing strategies, fixtures, snapshot testing, and CI/CD for data applications.
Untested Pipeline Tested Pipeline
┌─────────────────────┐ ┌─────────────────────┐
│ "It worked last │ │ Unit tests catch │
│ time I ran it" │ │ logic bugs early │
│ │ │ │
│ Fails silently │ │ Integration tests │
│ Wrong data loaded │ │ catch system issues │
│ Nobody notices for │ │ │
│ days or weeks │ │ CI/CD prevents bad │
│ │ │ code from deploying │
└─────────────────────┘ └─────────────────────┘
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