coveragecheck

coveragecheck is a tool that reports lines of code from diff that are not covered (or excluded) in project coverage report. The intent is for this tool to be invoked in a continuous integration pipeline to enforce that merging code has full statement coverage.

The tool is compatible with any diff in unified diff format, and a coverage report formatted as a JSON dictionary similar to the output of coverage.py. Example usage is shown below.

Installing

The simplest way to install is to use pip:

pip install coveragecheck

The tool can also be installed by cloning this repository and putting coveragecheck.py on your path:

git clone https://github.com/jdn5126/CoverageChecker.git

Continuous Integration Pipeline

For an example script for a continuous integration pipeline, check out the GitHub Actions configured for this repository in .github/workflows/coverage_check.yml. These steps should translate to any continuous integration application/automation server.

Example

The example directory, which contains a simple Python library and test file, allows us to test coveragecheck:

Add a new class to example/lib.py without any test coverage:

class Bar(object):
    def __init__(self, name):
        self.name = name

    def getName(self):
        return self.name

Generate the coverage report using coverage.py:

$ cd example
$ coverage run -m unittest discover
$ coverage json

Invoke coveragecheck to show missing coverage:

$ git diff | coveragecheck -r coverage.json
Failure
Files missing coverage:

example/lib.py:
16       self.name = name
19       return self.name

Add coverage to test.py:

from lib import Foo, Bar
...

class TestBarCoverage(unittest.TestCase):
    def test_bar(self):
        print( 'TestBarCoverage: test_bar')
        bar = Bar("bar")
        assert bar.getName() == "bar"

Regenerate coverage report as shown above, then invoke coveragecheck:

$ git diff | coveragecheck.py -r coverage.json
Success!

Contributing

Contributions and issues are welcome!

To get started, simply install the required Python dependencies using: pip install -r requirements.txt