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CONTRIBUTING.md

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Contributing

Code coverage

The current code coverage for the main branch is automatically published on every push to main on https://rust-pcap.github.io/pcap/.

Pre-requisites

To obtain code coverage locally you will need compatible LLVM coverage tools and grcov.

The easiest way to obtain compatible LLVM coverage tools is by adding the llvm-tools-preview rustup component (for nightly!):

rustup component add llvm-tools-preview

grcov can be installed through cargo:

cargo install grcov

Obtaining code coverage

Clean any previously compiled objects and binaries.

rm -rf ./target/debug/{coverage,profraw}
cargo clean -p pcap

Compile and run the tests. We set RUSTFLAGS="-C instrument-coverage" to enable source-based code coverage and LLVM_PROFILE_FILE="target/debug/coverage/profraw/pcap-%p-%m.profraw" to make sure each test gets its own profile information.

env RUSTFLAGS="-C instrument-coverage" \
    LLVM_PROFILE_FILE="target/debug/profraw/pcap-%p-%m.profraw" \
    cargo test --all-features --all-targets

And finally, run grcov to obtain a report.

grcov target/debug/profraw \
      --binary-path ./target/debug/ \
      --output-types html \
      --source-dir . \
      --ignore-not-existing \
      --ignore "build.rs" \
      --ignore "tests/*" \
      --ignore "examples/*" \
      --excl-start "GRCOV_EXCL_START|mod tests \{" \
      --excl-stop "GRCOV_EXCL_STOP" \
      --output-path ./target/debug/coverage/

The code coverage report will be available in target/debug/coverage/index.html which you can explore in your browser.

xdg-open target/debug/coverage/index.html

More information

For more information on LLVM code coverage in Rust: https://doc.rust-lang.org/rustc/instrument-coverage.html

For more information on grcov: https://github.com/mozilla/grcov