Fixed #18839 - Field.__init__() now calls super().

1 files changed, 14 insertions, 0 deletions

diff --git a/tests/forms_tests/tests/fields.py b/tests/forms_tests/tests/fields.py
index 95e14c4434..7516de29b4 100644
--- a/tests/forms_tests/tests/fields.py
+++ b/tests/forms_tests/tests/fields.py
@@ -63,6 +63,20 @@ class FieldsTests(SimpleTestCase):
         self.assertTrue(Field(required=True).widget.is_required)
         self.assertFalse(Field(required=False).widget.is_required)
 
+    def test_cooperative_multiple_inheritance(self):
+        class A(object):
+            def __init__(self):
+                self.class_a_var = True
+                super(A, self).__init__()
+
+
+        class ComplexField(Field, A):
+            def __init__(self):
+                super(ComplexField, self).__init__()
+
+        f = ComplexField()
+        self.assertTrue(f.class_a_var)
+
     # CharField ###################################################################
 
     def test_charfield_1(self):