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Bisect_ppx is a code coverage tool for OCaml. It helps you test
thoroughly by showing which parts of your code are not tested.
For a live demonstration, see the coverage report Bisect_ppx
generates for itself.
Most of these commands go in a
Makefile or other script, so that you only have
to run that script, then refresh your browser.
opam install bisect_ppx
bisect_ppxto your library- or executable-under-test. Instructions are
also available for Ocamlbuild, ocamlfind, and
(library (public_name my_code) (preprocess (pps bisect_ppx -conditional)))
bisect_ppxto your tests.
Run your test binary. In addition to testing your code, it will produce one
or more files with names like
BISECT_ENABLE=yes dune runtest
Generate the coverage report.
bisect-ppx-report -I _build/default/ -html coverage/ `find . -name 'bisect*.out'`
In each file of the report,
Green lines contain expressions, all of which were visited.
Red lines contain expressions, none of which were visited.
Yellow lines contain expressions, some of which were visited, but others not.
White lines are those that don't contain visitable expressions. They may have type declarations, keywords, or something else that Bisect_ppx did not, or cannot instrument.
See also the advanced usage.
You can generate a Coveralls json report using the
-coveralls flag. Note that Bisect_ppx reports are more precise than
Coveralls, which only considers whole lines as visited or not. The built-in
Coveralls reporter will consider a full line unvisited if any point on that
line is not visited, check the html report to verify precisly which points are
Example using the built-in Coveralls reporter on Travis CI (which sets
bisect-ppx-report \ -I _build/default/ \ -coveralls coverage.json \ -service-name travis-ci \ -service-job-id $TRAVIS_JOB_ID \ `find . -name 'bisect*.out'` curl -L -F json_file=@./coverage.json https://coveralls.io/api/v1/jobs
Bisect_ppx in practice
A small sample of projects using Bisect_ppx:
Bisect_ppx is available under the Mozilla Public License 2.0 (MPL). To
summarize, you can incorporate Bisect_ppx into proprietary projects. If you make
modifications to Bisect_ppx, you have to open-source them. The rest of your
project remains proprietary.
Essentially, this is like the BSD or MIT licenses, except that if you include
a customized Bisect_ppx in a release (as opposed to private use), you have to
make the altered source visible. This can be done by contributing the changes
back, keeping Bisect_ppx in a visible fork, or if your bigger project itself
also happens to be open source.
Besides proprietary licenses, MPL is compatible with BSD/MIT/Apache- and
(L)GPL-licensed projects. See the MPL 2.0 FAQ.
The Ocamlbuild plugin is dedicated to the public domain.
Bug reports and pull requests are warmly welcome. Bisect_ppx is developed on
GitHub, so please open an issue.
To get the latest development version of Bisect_ppx using OPAM, run
opam source --dev-repo --pin bisect_ppx
You will now have a
bisect_ppx subdirectory to work in.