Identify uncovered branches and missing test scenarios from cargo llvm-cov coverage output.
npx skills add https://github.com/JamieMason/syncpack --skill testing-gaps
Please help me install this Agent Skill. Skill: testing-gaps Source: https://github.com/JamieMason/syncpack/tree/main/.claude/skills/testing-gaps Command: npx skills add https://github.com/JamieMason/syncpack --skill testing-gaps
Rust projects can accumulate untested code paths that line-by-line review misses. This Skill runs coverage for a target source file, extracts uncovered branches, and classifies which gaps represent real-world scenarios worth testing versus defensive or dead code.
cargo llvm-cov with text output filtered to a single target file, excluding test files from results.preferred_semver.rs to find branches never exercised by the test suite and get a prioritized list of tests to write.Analyze test coverage for src/preferred_semver.rs and report uncovered branches plus missing real-world test scenarios.
High-intent search queries and answers about installing and using this skill.
Run cargo llvm-cov test with the --text flag and filter output to the target file using sed. Lines with an execution count of 0 indicate uncovered branches, which you can extract with grep for quick review.
Use cargo llvm-cov test --text with --ignore-filename-regex to exclude test files, then pipe through sed to isolate the section for your target file. The text format shows per-line execution counts that are easy to parse.
Use --text output when you need parseable, scriptable results for automated gap analysis. HTML reports are better for manual visual browsing but cannot be easily filtered or processed by command-line tools.
Classify each uncovered branch by tracing the code path that leads to it. Defensive or unreachable branches should be noted but skipped, while dead code should be considered for removal rather than tested.
Line coverage only shows which statements executed, not which combinations were tested. Features tested individually may never be tested together, and tests may only exercise one semver range type or configuration option.
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