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Mutation Testing Demo

This project demonstrates the use of mutation testing in Python using mutmut. Mutation testing helps in evaluating the quality of your test cases by introducing changes (mutations) to your code and checking if your tests can detect these changes.

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes.

Prerequisites

  • Python 3.10.13
  • pipenv

If you don't have pipenv installed, you can install it via pip:

pip install pipenv

Installation

First, clone the repository to your local machine:

git clone https://github.com/hernanzini/mutmut_demo.git
cd path/to/cloned/repository

Then, use pipenv to create a virtual environment and install the required dependencies:

pipenv install --dev

This will create a virtual environment and install the packages defined in Pipfile.

To interact with the project within the virtual environment, you have two options:

1. Activating the virtual environment:

pipenv shell

2. Running commands directly:

If you prefer not to activate the virtual environment, you can still run commands within it by prefixing them with pipenv run <command>.

Running the Tests

To run the standard test suite using pytest:

pytest -v

Check the coverage

pytest --cov=src
pytest --cov=src --cov-report term-missing
pytest --cov=src --cov-report html

Running mutmut

To perform mutation testing with mutmut:

mutmut run

After running mutation testing, you can check the results with:

mutmut results

To apply a mutant on disk:

  • mutmut apply <id>

To show a mutant:

  • mutmut show <id>

To view a more detailed HTML report of the mutation testing results:

mutmut html

Then, open the generated HTML file in your browser to view the report.

open html/index.html

Automation with a Script

For convenience, a script named mutmut.sh is included to automate the mutation testing process, generate the HTML report, and open it:

./mutmut.sh

Contributing

We welcome contributions to the Mutation Testing Demo! If you have an improvement or a bug fix, please follow these steps:

  1. Fork the repository.
  2. Create a new branch with a descriptive name for your feature or bug fix.
  3. Implement your changes. Make sure your code follows the project's style and has been tested.
  4. Submit a pull request with a clear description of what your changes are.

License

This project is made available under the terms of the MIT License. By contributing to or using the Mutation Testing Demo, you agree to abide by its terms.