added conftest.py for a better cleanup

conftest.py

+import os
+import shutil
+
+import pytest
+
+
+@pytest.fixture(autouse=True, scope='class')
+def teardown_module(pytestconfig):
+    yield
+    # dirname can be found at pytestconfig._assertstate.hook.session._initialparts[0][0].dirname but it is not clear for
+    # me, if there can be more than 1 entry in each of the lists. Therefore just loop over all elements will definitely
+    # catch all dirnames.
+    d = pytestconfig._assertstate.hook.session._initialparts
+    for di in d:
+        for dii in di:
+            if "data" in os.listdir(dii.dirname):
+                shutil.rmtree(os.path.join(dii.dirname, "data"), ignore_errors=True)