Tests

[flaport]

The library needs tests to prevent bugs. This library uses pytest as test suite, which is by far the most user friendly test-suite for Python. This is great, because this means anyone can add tests; it's super easy! Moreover, it makes you acquainted with the code, which is why it's labeled a good first issue.

When adding tests, keep the following in mind:

• Add tests to the right file in the tests folder
• Each test case should be a function with a name starting with test_
• Try to test only one single thing (a single assert) in each test case
• When repeating code over multiple tests, try to use pytest fixtures.
• Try to make the name of what you're testing as explicit as possible
• In case the function of a test is not clear from its name, add a docstring.
• Try to set a value for each argument and keyword argument. The default values might (and probably will) change, setting the values explicitly probably increases the lifetime of a test.
• Use black to typeset your code:

    pip install black
    black tests

• Never test floats directly; always use pytest.approx and similar.
• Use common sense values when creating tests.

When running the tests:

• Make sure the fdtd library is in your path
  • The easiest way to make this happen is by installing the library via pip install -e:

        pip uninstall fdtd # uninstall any previous version of the fdtd library
        git clone https://github.com/flaport/fdtd # if not cloned yet, clone the repository now.
        pip install -e fdtd # install as a development library
    

  • When installed this way, pip will link this local version of the fdtd library into your python path; any change in this development library will from now on be reflected in the version you import by default with python.
  • Note that pip install -e is executed in the folder containing the git repository NOT inside the git repository.
• Now, from inside the git repository, run

      pytest tests
  

• Or, if you want a coverage report (requires pytest-cov)

      pytest tests --cov-report html --cov fdtd
  

  • The coverage report can be found in the newly created htmlcov folder.