hpc-coveralls

hpc-coveralls converts and sends Haskell projects hpc code coverage to coverall.io.

At the moment, only Travis CI has been tested, but hpc-coveralls should be compatible with other CI services (Check HpcCoverallsMain source for the list).

hpc-coveralls is still under development and any contributions are welcome!

Usage

Travis CI

Below is the simplest example of configuration for your project .travis.yml:

script:
  - cabal configure --enable-tests --enable-library-coverage && cabal build && cabal test
after_script:
  - cabal install hpc-coveralls
  - hpc-coveralls [options] [test-suite-names]

If your build fails with an error message starting by "hpc:", just replace the cabal test command by run-cabal-test, as in the following example:

before_install:
  - cabal install hpc-coveralls
script:
  - cabal configure --enable-tests --enable-library-coverage && cabal build
  - run-cabal-test [options] [cabal-test-options]
after_script:
  - hpc-coveralls [options] [test-suite-names]

This will prevent the build to fail because of hpc related reasons, which are usually not fatal and should not affect the coverage data. Details are available in the next section.

You may also experience some issues related to your project dependencies, which can be solved by using the --avoid-reinstalls/--force-reinstalls flags.

For a real world example usage, please refer to this-project .travis.yml file (result on coveralls). You can also refer to the .travis.yml file of hpc-coveralls itself, which is configured with multi-ghc-travis.

The run-cabal-test command

Under certain conditions related to the project structure and the version of hpc, cabal test may output an error message and exit with the error code 1, which would result in a build failure.

To prevent this from happening, hpc-coveralls provides the run-cabal-test command which runs cabal test and returns with 0 if the following regular expression never matches any line of the output:

/^Test suite .*: FAIL$/

Below are some of the conditions under which you will likely need to use run-cabal-test:

• when using GHC 7.6 (hpc 0.6 known issue)
• when using GHC 7.8 with multiple test suites covering the same module(s) (issue #18)

Options

The --cabal-name option can be used to specify a custom executable name instead of the default cabal when calling cabal test.
Below is an example which can be useful for projects with a Travis configuration based on multi-ghc-travis:

run-cabal-test --cabal-name=cabal-1.18

The hpc-coveralls command

This command parses the hpc generated output, converts its to Coveralls json format and finally sends it to coveralls.io over http.
Multiple test suites can be specified, in which case the coverage report will be made of the merged coverage data generated by the specified test suites.
For example, if your test suite are named test1 and test2, use the command as follows:

hpc-coveralls test1 test2

As noted earlier,

Options

--exclude-dir

The --exclude-dir option allows to exclude source files located under a given directory from the coverage report.
You can exclude source files located under the test/ by using this option as in the following example:

hpc-coveralls --exclude-dir=test [test-suite-names]

You can specify multiple excluded folders by using the following example syntax:

hpc-coveralls --exclude-dir=test1 --exclude-dir=test2 [test-suite-names]

--coverage-mode

As Coveralls doesn't support partial-line coverage yet, hpc-coveralls currently converts hpc coverage data into line based coverage data, which is the only format supported at the moment. The --coverage-mode option allows to configure how the coverage data is converted into Coveralls format, based on your needs.
Below are the two modes currently available, with an explanation of what the hit count values mean.

--coverage-mode=AllowPartialLines (default):

• 0 : the line is never hit,
• 1 : the line is partially covered,
• 2 : the line is fully covered.

Note that AllowPartialLines conversion mode follows the same convention as the one used by cloverage coveralls output for Clojure projects code coverage.

--coverage-mode=StrictlyFullLines:

• 0 : the line is never hit or only partially covered,
• 1 : the line is fully covered.

Please also note that there is an open issue on coveralls issue tracker in order to improve this (add support for partial line coverage).

--dont-send

The --dont-send option prevents hpc-coveralls from sending the coverage report to coveralls.io. This option can be used together with --display-report for testing purpose.
For example, you can try various combinations of the other options and confirm the difference in the resulting report outputs.

Contributing

hpc-coveralls is still under development and any contributions are welcome!

Future Plans and Ideas

Please share your comments and suggestions on hpc-coveralls Gitter channel!

License

BSD3 (tl;dr)

Notes

• HPC publication: http://ittc.ku.edu/~andygill/papers/Hpc07.pdf