Collecting Smother Data¶
Smother is a wrapper around coverage.py, and by itself is pretty dumb. It basically runs coverage as normal, but stores the coverage output for each test separately. This doesn’t have a huge impact on the runtime of your test suite, although the size of the report will be larger.
Building a smother report currently requires that your test suite uses nose or pytest.
Installation¶
pip install smother
This installs the smother command line utility, as well as
plugins for nose and pytest.
Smother with pytest¶
You can invoke py.test with a --smother keyword
listing which modules you want to track smother data for.
py.test --smother=my_module
You can configure coverage-specific options by specifying a coveragerc file
(default is .coveragerc, but you can override via the --smother-config option).
See py.test --help for more keywords
Smother with Coverage¶
Smother cannot be enabled the same time as coverage.py – neither
will record the correct information given how they compete for python’s
settrace functionality. This means that you cannot run something like
py.test --smother=foo --cover=foo`` or ``nosetests --smother-package=foo --cover-package=foo``.
Instead, you should run smother by itself, and then produce a coverage file from a smother file
smother to_coverage
This will create a .coverage file that you can then use normally with coverage.py