diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..6d4bafe
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,30 @@
+import pytest
+from unittest import mock
+from openrecall.config import get_appdata_folder
+
+def test_get_appdata_folder_windows(tmp_path):
+    with mock.patch('sys.platform', 'win32'):
+        with mock.patch.dict('os.environ', {'APPDATA': str(tmp_path)}):
+            expected_path = tmp_path / 'openrecall'
+            assert get_appdata_folder() == str(expected_path)
+            assert expected_path.exists()
+
+def test_get_appdata_folder_windows_no_appdata():
+    with mock.patch('sys.platform', 'win32'):
+        with mock.patch.dict('os.environ', {}, clear=True):
+            with pytest.raises(EnvironmentError, match="APPDATA environment variable is not set."):
+                get_appdata_folder()
+
+def test_get_appdata_folder_darwin(tmp_path):
+    with mock.patch('sys.platform', 'darwin'):
+        with mock.patch('os.path.expanduser', return_value=str(tmp_path)):
+            expected_path = tmp_path / 'Library' / 'Application Support' / 'openrecall'
+            assert get_appdata_folder() == str(expected_path)
+            assert expected_path.exists()
+
+def test_get_appdata_folder_linux(tmp_path):
+    with mock.patch('sys.platform', 'linux'):
+        with mock.patch('os.path.expanduser', return_value=str(tmp_path)):
+            expected_path = tmp_path / '.local' / 'share' / 'openrecall'
+            assert get_appdata_folder() == str(expected_path)
+            assert expected_path.exists()