Test that the contents manager can load the global configuration file

when no local configuration file is found

jupytext/contentsmanager.py

@@ -437,20 +437,21 @@ def get_config_file(self, directory):
                     return path
 
             if not directory:
-                return find_global_jupytext_configuration_file()
+                return None
 
             parent_dir = self.get_parent_dir(directory)
             return self.get_config_file(parent_dir)
 
-        def load_config_file(self, config_file):
+        def load_config_file(self, config_file, is_os_path=False):
             """Load the configuration file"""
             if config_file is None:
                 return None
             self.log.info("Loading Jupytext configuration file at %s", config_file)
-            if config_file.endswith(".py"):
-                config_dict = load_jupytext_configuration_file(
-                    self._get_os_path(config_file)
-                )
+            if config_file.endswith(".py") and not is_os_path:
+                config_file = self._get_os_path(config_file)
+                is_os_path = True
+            if is_os_path:
+                config_dict = load_jupytext_configuration_file(config_file)
             else:
                 model = self.super.get(config_file, content=True, type="file")
                 config_dict = load_jupytext_configuration_file(

tests/test_cm_config.py

@@ -100,3 +100,26 @@ def test_incorrect_config_message(tmpdir, cfg_file, cfg_text):
 
     with pytest.raises(HTTPError, match=expected_message):
         cm.save(dict(type="notebook", content=SAMPLE_NOTEBOOK), "notebook.ipynb")
+
+
+def test_global_config_file(tmpdir):
+    cm_dir = tmpdir.join("cm_dir").mkdir()
+    cm = jupytext.TextFileContentsManager()
+    cm.root_dir = str(cm_dir)
+
+    tmpdir.join("jupytext.toml").write('default_jupytext_formats = "ipynb,Rmd"')
+
+    def fake_global_config_directory():
+        return [str(tmpdir)]
+
+    with mock.patch(
+        "jupytext.config.global_jupytext_configuration_directories",
+        fake_global_config_directory,
+    ):
+        nb = new_notebook(cells=[new_code_cell("1+1")])
+        model = dict(content=nb, type="notebook")
+        cm.save(model, "notebook.ipynb")
+        assert set(model["path"] for model in cm.get("/", content=True)["content"]) == {
+            "notebook.ipynb",
+            "notebook.Rmd",
+        }