A coverage plugin to provide sensible default settings

pip install covdefaults

to enable the plugin, add covdefaults to your coverage plugins

in .coveragerc:

[run]
plugins = covdefaults

in setup.cfg / tox.ini:

[coverage:run]
plugins = covdefaults

in pyproject.toml:

[tool.coverage.run]
plugins = ["covdefaults"]

branch = True
source = .
omit =
    */.tox/*
    */__main__.py
    */setup.py
    */venv*/*

show_missing = True
skip_covered = True
fail_under = 100
exclude_lines =
    # a more strict default pragma
    \# pragma: no cover\b

    # allow defensive code
    ^\s*raise AssertionError\b
    ^\s*raise NotImplementedError\b
    ^\s*return NotImplemented\b
    ^\s*raise$

    # typing-related code
    ^if (False|TYPE_CHECKING):
    : \.\.\.$
    ^ +\.\.\.$
    -> ['"]?NoReturn['"]?:

    # non-runnable code
    if __name__ == ['"]__main__['"]:$

    # additional platform related pragmas (see below)

several # pragma: no cover tags will be added automatically based on the platform and implementation.

these will be in the form of:

# pragma: TAG no cover

or

# pragma: TAG cover

these tags will be generated by the following values:

• os.name
  • nt (windows)
  • posix (linux, macOs, cygwin, etc.)
• sys.platform
  • cygwin
  • darwin (macOs)
  • linux
  • msys
  • win32
• sys.implementation.name
  • cpython
  • pypy

for every tag which does not match, you can use negation. here's an example:

if sys.platform == 'win32':  # pragma: win32 cover
    bin_dir = 'Scripts'
else:  # pragma: win32 no cover
    bin_dir = 'bin'

note here that # pragma: win32 cover will become a "no cover" for everything which is not win32 -- whereas the # pragma: win32 no cover will be a "no cover" only on win32.

several of the options can be overridden / extended in your coverage configuration. the examples below assume .coveragerc however any of the files coverage supports work as well.

[run]
omit =
    pre_commit/resources/*

this will result in the pre_commit/resources/* being omitted in addition to the defaults provided by covdefaults.

[covdefaults]
subtract_omit = */.tox/*

this will result in */.tox/* not being omitted (*/.tox/* is among the defaults provided by covdefaults).

[report]
exclude_lines =
    ^if MYPY:$

this will result in lines matching ^if MYPY:$ to additionally be excluded from coverage in addition to the defaults provided by covdefaults.

[report]
fail_under = 90

covdefaults will not change the value if you provide one for fail_under