Contributing in the form of code, feedback, ideas or bug reports are welcome. Code contributions are expected to pass all tests and style checks. If there are any problems let us know.

Running the tests

The test suite is divided into three parts:

Short and concise unit tests for internal modules and classes.
End to end tests of public functionality. Depends on external tools such as simulators.
Style checks such as PEP8 and license header verification.

The test suites must with both Python 2.7 and Python 3.x as well as with all supported simulators.

Testing with Tox

VUnit uses the Python tox tool. Tox makes it easier to automatically test VUnit in various configurations. Tox automates creation of virtual environments and installation of dependencies needed for testing. In fact, all of the tests can be run in a single command:

vunit/ > tox

If tox is not available in your Python environment, it can be installed from PyPI with pip:

vunit/ > pip install tox

For most developers, running the full testsuite will likely lead to failed test cases because not all Python interpreters or HDL simulators are installed in their environment. More focused testing is possible by specifying which tox “environments” should be tested. For example, assume a developer uses Python 2.7 and Modelsim and would like to test changes using tools available in his environment:

vunit/ > tox -e py27-unit,py27-acceptance-modelsim

A full list of test environments can be seen by issuing the following command:

vunit/ > tox -l


Other than the dependencies required to use VUnit as a user the following are also required for developers to run the test suite manually:

For Python 2.7 only, built into Python 3.x
Coding style check.
Code analysis.

Code coverage

Code coverage can be measured using the coverage tool. The following commands measure the code coverage while running the entire test suite:

vunit/ > coverage run --branch --source vunit/ -m unittest discover vunit/test/
vunit/ > coverage html --directory=htmlcov
vunit/ > open htmlcov/index.html

Developers should ensure that new code is well covered. As of writing this paragraph the total coverage was 92%. Missing coverage can be analyzed by opening the generated htmlcov/index.html produced by the above commands.