hpc-lcov

Convert HPC output into lcov.info files that can be uploaded to coverage services, like Codecov.

Quickstart

1. Download hpc-lcov from the releases page or install it from Hackage with your favorite package manager
2. Run your tests with coverage enabled
   • stack test --coverage
   • Cabal is not yet supported (#3)
3. Run hpc-lcov
4. Upload the generated lcov.info file to your coverage service

FAQs

How do I convert coverage for an executable?

Note: If you have both tests and executables, HPC will write module information to the same file. Because of this, you'll have to load the coverage for each separately, with a stack clean in between.

1. Build a single executable with coverage enabled (e.g. stack build :my-exe --coverage)
2. Run the executable
3. This should generate a .tix file in the current directory
4. Run the following, specifying the package that builds the executable:

   stack exec -- hpc-lcov --file my-exe.tix --main-package my-package

How do I merge coverage files?

1. Install LCOV (e.g. brew install lcov)

2. Run

   lcov -a lcov1.info -a lcov2.info ... > lcov.info

Resources

• LCOV format description
• More info on HPC