python3-testing
Testing Patterns
Consult python3-core for standing defaults (coverage, test naming, AAA).
Test Failure Mindset
Tests are specifications. When a test fails, investigate both possibilities:
| Hypothesis A | Hypothesis B |
|---|---|
| Test expectations are wrong | Implementation has a bug |
| Test is outdated | Test caught a regression |
| Test has wrong assumptions | Test found an edge case |
Red flags: Never immediately change tests to match implementation. Never assume implementation is always correct. Never bulk-update tests without individual analysis.
Fixture Design
- Session fixtures for expensive resources (DB, servers)
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