Swapping out unittest.TestCase super class in other library

davetapley · April 26, 2024, 7:06pm

I’ve subclassed unittest.TestCase in my code base to add helper functions.

But I’m also using the falcon package which has it’s own TestCase subclass, and I’d like to leverage that for some of my tests.

Can anyone recommend a strategy for reconciling the two?

I’m already running on a falcon fork so I’m not opposed to making changes there and make a PR, but I’m not even sure how I’d go about that?

kknechtel · April 26, 2024, 7:15pm

Why not just… subclass that class instead?

davetapley · April 26, 2024, 7:25pm

I should have been clearer: I’m using my own TestCase subclass in lots of other tests already (and it seems a bit silly to have them inherit falcon.TestCase when they aren’t exercising any web code.

But! I can move my code to a mixin, then use two subclasses, one can mixin regular unittest.TestCast and the other the falcon.TestCase. That should work.

Thanks

JamesParrott · April 26, 2024, 8:27pm

Why would Falcon and Testtools both choose to break backward compatibility with the core library, that they both clearly mimick? Falcon’s TestCase subclasses testtools.TestCase, and testtools.TestCase subclasses unittest.TestCase for you.

github.com

falconry/falcon/blob/e619c39ab8a9ac6186eee866ad964f01c43bf6bf/falcon/testing/test_case.py#L34


      
              import unittest  # type: ignore
          
          import falcon
          import falcon.request
          
          # TODO hoist for backwards compat. Remove in falcon 4.
          from falcon.testing.client import Result  # NOQA
          from falcon.testing.client import TestClient
          
          
          class TestCase(unittest.TestCase, TestClient):
              """Extends :py:mod:`unittest` to support WSGI/ASGI functional testing.
          
              Note:
                  If available, uses :py:mod:`testtools` in lieu of
                  :py:mod:`unittest`.
          
              This base class provides some extra plumbing for unittest-style
              test cases, to help simulate WSGI or ASGI requests without having
              to spin up an actual web server. Various simulation methods are
              derived from :py:class:`falcon.testing.TestClient`.

github.com

testing-cabal/testtools/blob/master/testtools/testcase.py#L222


      
              # 0x1eff is the end of the range of these diacritical chars.
              BASE_CP = 0x1E00
              CP_RANGE = 0x1F00 - BASE_CP
              index = 0
              while True:
                  unique_text = _unique_text(BASE_CP, CP_RANGE, index)
                  yield f"{prefix}-{unique_text}"
                  index = index + 1
          
          
          class TestCase(unittest.TestCase):
              """Extensions to the basic TestCase.
          
              :ivar exception_handlers: Exceptions to catch from setUp, runTest and
                  tearDown. This list is able to be modified at any time and consists of
                  (exception_class, handler(case, result, exception_value)) pairs.
              :ivar force_failure: Force testtools.RunTest to fail the test after the
                  test has completed.
              :cvar run_tests_with: A factory to make the ``RunTest`` to run tests with.
                  Defaults to ``RunTest``.  The factory is expected to take a test case
                  and an optional list of exception handlers.

Does Pytest need anything special to run Falcon and testtools tests? Has a Pytest plug-in been made for this?

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Swapping out unittest.TestCase super class in other library

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