diff --git a/tests/postgres_tests/test_array.py b/tests/postgres_tests/test_array.py
index 03ffa4d637..71d0603469 100644
--- a/tests/postgres_tests/test_array.py
+++ b/tests/postgres_tests/test_array.py
@@ -753,6 +753,13 @@ class TestSimpleFormField(PostgreSQLTestCase):
         vals = ['a', 'b', 'c']
         self.assertEqual(field.clean(vals), vals)
 
+    def test_has_changed(self):
+        field = SimpleArrayField(forms.IntegerField())
+        self.assertIs(field.has_changed([1, 2], [1, 2]), False)
+        self.assertIs(field.has_changed([1, 2], '1,2'), False)
+        self.assertIs(field.has_changed([1, 2], '1,2,3'), True)
+        self.assertIs(field.has_changed([1, 2], 'a,b'), True)
+
 
 class TestSplitFormField(PostgreSQLTestCase):