test: add unit tests for FrameTracer and DivergenceDetector#218
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51 tests covering TokenUsage arithmetic, FrameEvent/FrameLifetimeTrace serialization, build_frame_tree, FrameCaptureContext parent-child linking, capture_function_call decorator (success/exception/options), helper functions (get_frame_by_id, get_frames_at_depth, filter_frames_by_name, get_cost_breakdown), serialization round-trip, DivergenceType/Severity enums, DivergencePoint.to_dict, detect_divergences, compare_session_structures, analyze_temporal_divergence, and analyze_behavioral_divergence. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Closes #208
tests/test_frame_tracer_divergence.pywith 51 unit tests coveringFrameTracerandDivergenceDetector(both had zero coverage)FrameTracer:TokenUsagearithmetic/serialization,FrameEventdataclass andto_dict(),FrameLifetimeTraceconstruction,capture_function_calldecorator (with/without context, exception capture, option flags), call tree building, cost breakdown, helper functions, round-trip serializationDivergenceDetector:DivergenceType/DivergenceSeverityenum values,DivergencePointdataclass andto_dict(),detect_divergences()(empty, identical, count mismatch, session ID extraction, summary, critical severity),compare_session_structures(),analyze_temporal_divergence(),analyze_behavioral_divergence()Test plan
ruff check .— all checks passedpython3 -m pytest -q tests/test_frame_tracer_divergence.py— 51 passed in 0.51s🤖 Generated with Claude Code