diff --git a/utests/test_sql_database.py b/utests/test_sql_database.py
index 7143dc8..d486751 100644
--- a/utests/test_sql_database.py
+++ b/utests/test_sql_database.py
@@ -80,6 +80,29 @@ def test_sample_crud():
     assert movie.title == name
 
 
+def test_genre_custom_type_serialize_value():
+    name = rand_name()
+
+    genres = ["Yes", "No"]
+    with db_context() as db:
+        movie = crud.create_movie(db, title=name, genres=genres)
+    assert movie.genres == genres
+
+
+def test_genre_custom_type_serialize_type():
+    name = rand_name()
+    genres = ["Yes", "No"]
+    csv_genres = ",".join(genres)
+
+    try:
+        with db_context() as db:
+            movie = crud.create_movie(db, title=name, genres=csv_genres)
+    except TypeError as exc:
+        assert "tuple" in str(exc)
+    else:
+        raise RuntimeError("Exception should have been raised")
+
+
 def test_list_movies():
     clear_db()
     response = client.get("/movies/")