[pytest-dev] Test discovery by subclassing

[Bruno Oliveira]

Hi Dave,

Using plain pytest that is currently not possible, and I’m not aware of any
plugin which allows this.

You can implement your own collection rules by implementing the
pytest_pycollect_makeitem
<http://pytest.org/latest/writing_plugins.html#_pytest.hookspec.pytest_pycollect_makeitem>
hook. I suggest taking a look at how pytest itself does it
<https://github.com/pytest-dev/pytest/blob/master/_pytest/python.py#L306>
to get some guidance, but I think this would be enough for your case:

# conftest.pyimport inspect
class X: pass
def pytest_pycollect_makeitem(collector, name, obj):
    if inspect.isclass(obj) and issubclass(obj, X):
        Class = collector._getcustomclass("Class")
        return Class(name, parent=collector)
# test_foo.pyfrom conftest import X
class Foo(X):
    def test_foo(self):
        pass

test_foo.py::Foo::test_foo PASSED

========================== 1 passed in 0.13 seconds ===========================

Cheers,
Bruno.
​

On Tue, Apr 19, 2016 at 7:46 AM Dave <dave.hirschfeld at gmail.com> wrote:

> Hi,
> Instead of discovering tests by name matching is there any way to specify
> that all subclasses of X be collected?
>
> I realise this can be done by subclassing unittest.TestCase but that is a)
> pretty heavyweight and b) seems to break parameterised fixtures for me.
>
>
> Thanks,
> Dave
>
>
> _______________________________________________
> pytest-dev mailing list
> pytest-dev at python.org
> https://mail.python.org/mailman/listinfo/pytest-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/pytest-dev/attachments/20160419/19c4d8b7/attachment.html>