Pynguin is a tool for automated unit test generation for Python
Pynguin (IPA: ˈpɪŋɡuiːn), the PYthoN General UnIt test geNerator, is a tool that allows developers to generate unit tests automatically.
Testing software is often considered to be a tedious task. Thus, automated generation techniques have been proposed and mature tools exist—for statically typed languages, such as Java. There is, however, no fully-automated tool available that produces unit tests for general-purpose programs in a dynamically typed language. Pynguin is, to the best of our knowledge, the first tool that fills this gap and allows the automated generation of unit tests for Python programs.
Pynguin executes the module under test! As a consequence, depending on what code is in that module, running Pynguin can cause serious harm to your computer, for example, wipe your entire hard disk! We recommend running Pynguin in an isolated environment; use, for example, a Docker container to minimize the risk of damaging your system.
Pynguin is only a research prototype! It is not tailored towards production use whatsoever. However, we would love to see Pynguin in a production-ready stage at some point; please report your experiences in using Pynguin to us.
Before you begin, ensure you have met the following requirements:
You have installed Python 3.10 (we have not yet tested with Python 3.11, there might be some problems due to changed internals regarding the byte-code instrumentation).
Attention: Pynguin now requires Python 3.10! Older versions are no longer supported!
You have a recent Linux/macOS/Windows machine.
Please consider reading the online documentation to start your Pynguin adventure.
Pynguin can be easily installed using the
pip tool by typing:
pip install pynguin
Make sure that your version of
pip is that of a supported Python version, as any
older version is not supported by Pynguin!
Before you continue, please read the quick start guide
Pynguin is a command-line application.
Once you installed it to a virtual environment, you can invoke the tool by typing
pynguin inside this virtual environment.
Pynguin will then print a list of its command-line parameters.
A minimal full command line to invoke Pynguin could be the following,
where we assume that a project
foo is located in
we want to store Pynguin's generated tests in
and we want to generate tests using a whole-suite approach for the module
(wrapped for better readability):
pynguin \ --project-path /tmp/foo \ --output-path /tmp/testgen \ --module-name foo.bar
Please find a more detailed example in the quick start guide.
Contributing to Pynguin
For the development of Pynguin you will need the
dependency management and packaging tool.
To start developing, follow these steps:
Clone the repository
Change to the
Create a virtual environment and install dependencies using
Make your changes
make checkto verify that your changes pass all checks
Please see the
poetrydocumentation for more information on this tool.
Maintainer: Stephan Lukasczyk
- Tucker Blue
- Gordon Fraser
- Abdur-Rahmaan Janhangeer
- Maximilian Königseder
- Florian Kroiß
- Simon Labrenz
- Roman Levin
- Juan Julián Merelo Guervós
- Lukas Steffens
- Florian Straubinger
- Sara Tavares
Development using PyCharm.
If you want to use the PyCharm IDE you have to set up a few things:
- Let PyCharm configure configure a virtual environment using
- Set the default test runner to
- Set the DocString format to
This project is licensed under the terms of the MIT License. Pynguin was using the GNU Lesser General Public License (LGPL) until version 0.29.0, its licence was changed with version 0.30.0.
Release history Release notifications | RSS feed
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.