Workaround import mishmash in %check

The namespace sphinxcontrib package made this problematic,
because the package in $pwd was not namespace, but regular.

Alternatively, sphinxcontrib/__init__.py could have been deleted,
but not in %prep, because the package does not install without it.

This solution makes sure we are testing what we are shipping.

Fixes https://bugzilla.redhat.com/show_bug.cgi?id=1733681

python-sphinxcontrib-websupport.spec

@@ -50,7 +50,11 @@ rm -rf %{pypi_name}.egg-info
 %py3_install
 
 %check
-%{__python3} -m pytest tests/
+mkdir empty && pushd empty # don't run the tests from sources
+export PYTHONPATH=%{buildroot}%{python3_sitelib}
+%{__python3} -m pytest ../tests
+popd
+rmdir empty
 
 %files -n python3-%{pypi_name}
 %license LICENSE