Add isolated test coverage directories to prevent collisions#9
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When running tests in parallel, multiple tests may cover the same source file, causing coverage data collisions. This change gives each test file its own isolated coverage directory (cover_db_N) and then merges them all into a single cover_db after all tests complete. Key changes: - runner.go: Each test gets its own isolated coverage directory (cover_db_N) - coverage.go: Added MergeCoverageDBs function to merge multiple coverage directories into a single output directory - cli.go: After running tests, collects and merges isolated coverage directories, then cleans up the temporary directories Co-Authored-By: Claude claude-opus-4-5-20251101 <noreply@anthropic.com>
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When running tests in parallel, multiple tests may cover the same source
file, causing coverage data collisions. This change gives each test file
its own isolated coverage directory (cover_db_N) and then merges them
all into a single cover_db after all tests complete.
Key changes:
directories into a single output directory
directories, then cleans up the temporary directories
Co-Authored-By: Claude claude-opus-4-5-20251101 noreply@anthropic.com