diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 27d88a0..585d6fe 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -196,11 +196,16 @@
             (SystemExit, ('foo',),
                 {'message' : 'foo', 'args' : ('foo',), 'code' : 'foo'}),
             (IOError, ('foo',),
-                {'message' : 'foo', 'args' : ('foo',)}),
+                {'message' : 'foo', 'args' : ('foo',), 'filename' : None,
+                 'errno' : None, 'strerror' : None}),
             (IOError, ('foo', 'bar'),
-                {'message' : '', 'args' : ('foo', 'bar')}),
+                {'message' : '', 'args' : ('foo', 'bar'), 'filename' : None,
+                 'errno' : 'foo', 'strerror' : 'bar'}),
             (IOError, ('foo', 'bar', 'baz'),
-                {'message' : '', 'args' : ('foo', 'bar')}),
+                {'message' : '', 'args' : ('foo', 'bar'), 'filename' : 'baz',
+                 'errno' : 'foo', 'strerror' : 'bar'}),
+            (IOError, ('foo', 'bar', 'baz', 'quux'),
+                {'message' : '', 'args' : ('foo', 'bar', 'baz', 'quux')}),
             (EnvironmentError, ('errnoStr', 'strErrorStr', 'filenameStr'),
                 {'message' : '', 'args' : ('errnoStr', 'strErrorStr'),
                  'strerror' : 'strErrorStr', 'errno' : 'errnoStr',