diff --git a/tests/test_config.py b/tests/test_config.py
new file mode 100644
index 0000000..4d2be0a
--- /dev/null
+++ b/tests/test_config.py
@@ -0,0 +1,14 @@
+def test_api_key_list_empty_when_unset():
+    from axon.config import Settings
+    s = Settings(api_keys=None)
+    assert s.api_key_list == []
+
+def test_api_key_list_parses_csv():
+    from axon.config import Settings
+    s = Settings(api_keys="key1, key2 , key3")
+    assert s.api_key_list == ["key1", "key2", "key3"]
+
+def test_api_key_list_single():
+    from axon.config import Settings
+    s = Settings(api_keys="only-key")
+    assert s.api_key_list == ["only-key"]