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Python System Test Framework

Project description

Welcome to PySys!

PySys is an easy-to-use cross-platform framework for writing and orchestrating all your system/integration tests, combined seamlessly with your unit and manual tests.

It provides a comprehensive package of methods to make all the common system/integration testing operations a breeze, as well as the flexibility to add whatever test execution and validation logic you need using the full power of the Python language.

Whatever language the application you’re testing is written in, and whatever platforms it needs to run on, PySys can help!

Key features include:

  • A comprehensive library of assertion methods appropriate for system-level testing, such as checking for error/success messages in log files and comparing the contents of output files.

  • A comprehensive library of methods to automate platform-independent process starting, orchestration, and cleanup, for both Windows and Unix-based systems. Includes common operations such as:

    • dynamic port allocation,
    • waiting until a server is running on a specified port
    • waiting until a file contains a specified message,
    • aborting early if an error message is detected
  • Support for executing tests in parallel to significantly speed up execution time, with a flexible mechanism for controlling execution order.

  • Support for executing the same test in several modes during your test run (for example against different web browsers, databases, etc).

  • A process memory monitoring framework to check for memory leaks when soak testing your application.

  • A performance monitoring framework for recording and aggregating latency, throughput and other performance metrics.

  • A pluggable “writers” framework for recording test outcomes in any format, including a standard JUnit-compatible XML results writer in the box, and support for running tests under Travis CI.

  • Integrated support for running PyUnit tests and doctests, in case your application is also written in Python.

  • Integrated support for executing manual/interactively driven test cases.

  • Test categorization and selective include/exclude execution, using per-test classification groups.

  • Support for Windows, Linux, macOS and Solaris.

PySys was created by Moray Grieve. The current maintainer is Ben Spiller. This is a community project so we welcome your contributions, whether enhancement issues or GitHub pull requests!


PySys can be installed into Python 3.8 (recommended), 3.7/3.6/3.5 or Python 2.7 (though note that Python 2.7 will soon be out of support from the Python team).

The best way to install PySys is using the standard pip installer which downloads and install the binary package for the current PySys release, by executing:

> python -m pip install PySys

Alternatively, you can download the binary .whl package from and use python -m pip install PySys-<VERSION>.whl instead.

Make sure you have an up-to-date pip using python -m pip install --upgrade pip. See for more information about using pip.


On Windows, pip will automatically install the pywin32 and colorama libraries that PySys depends upon.

The executable launcher script is installed into the Scripts\ directory of the Python installation, e.g. c:\Python\Scripts\ To allow easy invocation of PySys from any test directory you may wish to add the Scripts directory to your PATH or copy the script to a location that is already on PATH. Alternatively you can run PySys using python -m pysys.


The executable launcher script is installed into Python’s binary directory, e.g. /usr/local/bin, and hence should be on the current user’s PATH automatically; if not, just add it. Alternatively you can run PySys using python -m pysys.

Those wishing to use the manual tester should ensure they have installed the tcl/tk libraries on the host machine and are using a Python version that was compiled with tcl/tk support.

Getting Started

After installation, to see the available options to the script use:

> --help

The script has four main commands:

  • makeproject to create your top-level testing project configuration file,
  • make to create individual testcases,
  • run to execute them, and
  • clean to delete testcase output after execution.

For detailed information, see the --help command line.

To get started, create a new directory to hold your tests. Then run the makeproject command from that directory to add a pysysproject.xml file which will hold default settings your all your tests:

> mkdir tests
> cd tests
> makeproject

Then to create your first test, run:

> make MyApplication_001

This will create a MyApplication_001 subdirectory with a pysystest.xml file holding metadata about the test such as its title, and a where you can add the logic to execute your test, and to validate that the results are as expected.

To run your testcases, simply execute:

> run

Now take a look at pysys.basetest to begin exploring all the functionality PySys provides to help you implement your own test classes.

You might also want to take a look at our sample testcases. These can be downloaded as a .tar.gz containing files with Unix line endings, or a .zip using Windows line endings from The fibonacci directory is a good place to start.


PySys System Test Framework

Copyright (C) 2006-2020 M.B. Grieve

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

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