Fix issue #3372

testing/python/raises.py

@@ -1,3 +1,4 @@
+from _pytest.outcomes import Failed
 import pytest
 import sys
 
@@ -147,3 +148,20 @@ class TestRaises(object):
         with pytest.raises(ValueError):
             with pytest.raises(IndexError, match='nomatch'):
                 int('asdf')
+
+    def test_raises_exception_looks_iterable(self):
+        from six import add_metaclass
+
+        class Meta(type(object)):
+            def __getitem__(self, item):
+                return 1/0
+
+            def __len__(self):
+                return 1
+
+        @add_metaclass(Meta)
+        class ClassLooksIterableException(Exception):
+            pass
+
+        with pytest.raises(Failed, match="DID NOT RAISE <class 'raises.ClassLooksIterableException'>"):
+            pytest.raises(ClassLooksIterableException, lambda: None)