This python-mutation-report performs a mutation test on the changed lines in the pull request with mutmut of the pip package, and comments the mutation test summary as shown in the example below.

• If the directory structure is as follows.

  .
  ├── README.md
  └── python-project
      ├── Pipfile
      ├── Pipfile.lock
      ├── src
      │   ├── __init__.py
      │   ├── src_1.py
      │   └──  src_2.py
      └── tests
          ├── __init__.py
          ├── test_src_1.py
          └──  test_src_2.py
  

on:
  pull_request:
    paths:
      - "python-project/src/**"
      - "python-project/tests/**"

jobs:
  mutation-testing-report:
    runs-on: ubuntu-latest
    name: Mutation testing report
    timeout-minutes: 15
    permissions:
      pull-requests: write
      contents: read

    steps:
      - uses: actions/checkout@v4

      - uses: Century-ss/python-mutation-report@v2
        with:
          lock-file-path: "python-project/Pipfile.lock"
          src-directory: "python-project/src"
          test-directory: "python-project/tests"
          where-to-run-test: "python-project"
          python-version: "3.11"

• Only pull_request events are supported.
• Perform mutation test only on pull_request changed lines in files under src-directory.
• Only ubuntu and mac os runners are supported.
• Only pytest is supported as a test module.
• Write permission for pull_request and read permission for contents is required.
• If there are many changed files in the pull_request, it may take longer, so it is recommended to set a timeout-minutes.

• If the change diff has a hoge.py in the src file, trying to find test_hoge.py in the test directory
  • If test_hoge.py is found, include hoge.py and test_hoge.py in the mutation test.
  • If test_hoge.py is not found, not include hoge.py in the mutation test.
  • If multiple test_hoge.py is found, include them all in the mutation test.

• Required parameters
  • lock-file-path: Lock file path for installing python dependencies. The following lock files are supported.
    • requirements.txt of pip.
    • Pipfile.lock of pipenv
    • requirements-dev.lock or requirements.lock of rye.
  • src-directory: Directory path of the source to plant the mutant.
  • test-directory: Directory path of the test to evaluate the mutant.
• Optional parameters.
  • where-to-run-test: Path to the location where　test is run. Default is ".", it runs in the repository root directory.
  • python-version: Version of python used. Default is "3.11"

No outputs.