Improved error message when index in __getitem__() is invalid.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index 18fb4a94de..45f5405fee 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -746,6 +746,15 @@ Java</label></li>
             [str(bf[1]), str(bf[2]), str(bf[3])],
         )
 
+    def test_boundfield_invalid_index(self):
+        class TestForm(Form):
+            name = ChoiceField(choices=[])
+
+        field = TestForm()['name']
+        msg = 'BoundField indices must be integers or slices, not str.'
+        with self.assertRaisesMessage(TypeError, msg):
+            field['foo']
+
     def test_boundfield_bool(self):
         """BoundField without any choices (subwidgets) evaluates to True."""
         class TestForm(Form):