Merged revisions 67908 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r67908 | skip.montanaro | 2008-12-22 21:30:15 -0600 (Mon, 22 Dec 2008) | 4 lines

  As a result of a regression that snuck into 2.5.3 add a test case that
  ensures that when you try to read from a file opened for writing an IOError
  is raised.
........
diff --git a/Lib/test/test_file.py b/Lib/test/test_file.py
index ff4996a..7a68b2f 100644
--- a/Lib/test/test_file.py
+++ b/Lib/test/test_file.py
@@ -123,6 +123,8 @@
         except:
             self.assertEquals(self.f.__exit__(*sys.exc_info()), None)
 
+    def testReadWhenWriting(self):
+        self.assertRaises(IOError, self.f.read)
 
 class OtherFileTests(unittest.TestCase):