Backport %check section from master

python-tox.spec

@@ -68,6 +68,8 @@ Obsoletes:      python2-tox < 2.9.1-4
 # for tests
 BuildRequires:  python3-py
 BuildRequires:  python3-pytest
+BuildRequires:  python3-pytest-mock
+BuildRequires:  python3-pytest-xdist
 BuildRequires:  python3-virtualenv
 %endif
 
@@ -100,7 +102,26 @@ rm -rf %{pypiname}.egg-info
 # if internet connection available, run tests
 %if %{with internet}
 %check
-TOXENV=py%{python3_version_nodots} %{__python3} setup.py test
+# there will be failures like
+#    ModuleNotFoundError: tox
+# or InterpreterNotFound: python
+# We juggle the environment variables as much as we can, but it's not perfect.
+# To workaround this:
+#    1. build --without internet
+#    2. install the new python3-tox
+#    3. build --with internet
+mkdir .path
+ln -s %{__python3} .path/python
+ln -s /usr/bin/easy_install-%{python3_version} .path/easy_install
+ln -s /usr/bin/pytest-%{python3_version} .path/pytest
+ln -s /usr/bin/pip3 .path/pip
+export PATH=$(pwd)/.path:%{buildroot}%{_bindir}:$PATH
+export PYTHONPATH=%{buildroot}%{python3_sitelib}
+export TOXENV=py%{python3_version_nodots}
+export TOX_TESTENV_PASSENV="PATH TOX_TESTENV_PASSENV"
+# TODO figure out why PEP517/518 tests and test_provision_cli_args_ignore won't pass
+pytest-3 -n auto -k "not test_verbose_isolated_build and not test_dist_exists_version_change and not test_alwayscopy"
+rm -rf .path
 %endif
 
 %files -n python3-%{pypiname}