Skip unsupported radicale test

Author: Hugo Osvaldo Barrera

tests/storage/__init__.py

@@ -201,6 +201,8 @@ def test_create_collection(self, requires_collections, get_storage_args,
         if getattr(self, 'dav_server', '') in \
            ('icloud', 'fastmail', 'davical'):
             pytest.skip('Manual cleanup would be necessary.')
+        if getattr(self, 'dav_server', '') == "radicale":
+            pytest.skip("Radicale does not support collection creation")
 
         args = get_storage_args(collection=None)
         args['collection'] = 'test'