test: add unit tests for PatternDetector (closes #252)#253
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Expand tests/patterns/test_pattern_detector.py from 21 to 39 tests, covering previously untested paths: Pattern.to_dict() roundtrip, helper method edge cases (empty sessions, zero tool calls, rate calculations), severity escalation to critical, zero-baseline error rate handling, no-pattern-below-threshold cases for all detectors, baseline < 3 guard, and critical-before-warning sort order in detect_all_patterns(). Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
tests/patterns/test_pattern_detector.pyfrom 21 → 39 testsTestPatternDataclass—to_dict()key presence and value roundtripTestHelperMethods— empty sessions, zero tool calls, rate calculationsTest plan
python3 -m pytest -q tests/patterns/test_pattern_detector.py→ 39 passedCloses #252
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