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Coverage Measurement

Wallet-core is a stable project, we value stability and safety over new features.

Test coverage is one important facet of assuring code quality, and we are strict about high test coverage.

Checking Coverage Summary in CI build

The Linux CI and Linux CI Rust CI builds (executed on PRs and commits) contain coverage measurement, and summary is available in the build output:

Summary coverage rate:
  lines......: 94.5% (14576 of 15426 lines)
  functions..: 95.0% (2688 of 2830 functions)

Detailed Coverage Report

Detailed coverage report can be generated locally. It includes file and line-level info on coverage.

Steps:

  • Run tools/generate-file to make sure new added files are generated

  • Run cmake with -DCODE_COVERAGE=ON to enable coverage measurement

cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Debug -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCODE_COVERAGE=ON
  • Build tests
make -Cbuild -j12 tests TrezorCryptoTests
  • Cleanup any old coverage files, and run unit tests
find . -name "*.gcda" -exec rm {} \;
./build/trezor-crypto/crypto/tests/TrezorCryptoTests
./build/tests/tests tests --gtest_output=xml
  • Generate coverage info (slow). With the html argument the script will generate HTML report as well:
./tools/coverage html

if you see genhtml (from lcov) error on macOS like below:

c++filt: Unknown command line argument '--no-strip-underscores'.  Try: '/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++filt --help'
c++filt: Did you mean '--no-strip-underscore'?
genhtml: ERROR: c++filt output not as expected (0 vs 11) lines

please upgrade lcov to min. 1.16, or patch genhtml (for example /usr/local/Cellar/lcov/1.15/libexec/bin/), change --no-strip-underscores to --no-strip-underscore

Open the generated coverage/index.html to view the report.

See also tools/coverage and linux-ci.yml

Detailed Rust Coverage Report

Detailed Rust coverage report can be generated locally. It includes file and line-level info on coverage.

Steps:

  • Switch to the nightly toolchain and install dev dependencies
tools/install-rust-dependencies dev
  • Run Rust tests and generate coverage info (slow). With the html argument the script will generate HTML report as well:
./tools/rust-coverage html