Index: Lib/test/test_float.py
===================================================================
--- Lib/test/test_float.py	(revision 59545)
+++ Lib/test/test_float.py	(working copy)
@@ -129,12 +129,29 @@
         floats_file.close()
 
 
+class StrFormatETestCase(unittest.TestCase):
+    def test_str_format_e(self):
+        self.assertEqual("1.234e+009", "%.3e" %1.23405e+9)
+        self.assertEqual("1.234e-009", "%.3e" %1.23405e-9)
+        self.assertEqual("1.234E+009", "%.3E" %1.23405e+9)
+        self.assertEqual("1.234E-009", "%.3E" %1.23405e-9)
+        self.assertEqual("1.234e+027", "%.3e" %1.23405e+27)
+        self.assertEqual("1.234e-027", "%.3e" %1.23405e-27)
+        self.assertEqual("1.234E+027", "%.3E" %1.23405e+27)
+        self.assertEqual("1.234E-027", "%.3E" %1.23405e-27)
+        self.assertEqual("1.234e+132", "%.3e" %1.23405e+132)
+        self.assertEqual("1.234e-132", "%.3e" %1.23405e-132)
+        self.assertEqual("1.234E+132", "%.3E" %1.23405e+132)
+        self.assertEqual("1.234E-132", "%.3E" %1.23405e-132)
+
+
 def test_main():
     test_support.run_unittest(
         FormatFunctionsTestCase,
         UnknownFormatTestCase,
         IEEEFormatTestCase,
-        #ReprTestCase
+        #ReprTestCase,
+        StrFormatETestCase,
         )
 
 if __name__ == '__main__':