diff --git a/Lib/test/test_warnings.py b/Lib/test/test_warnings.py
index 7a9459a..11dc294 100644
--- a/Lib/test/test_warnings.py
+++ b/Lib/test/test_warnings.py
@@ -593,6 +593,63 @@
         self.assertEqual(expect, self.module.formatwarning(message,
                                     category, file_name, line_num, file_line))
 
+    @test_support.requires_unicode
+    def test_formatwarning_unicode_msg(self):
+        message = u"msg"
+        category = Warning
+        file_name = os.path.splitext(warning_tests.__file__)[0] + '.py'
+        line_num = 3
+        file_line = linecache.getline(file_name, line_num).strip()
+        format = "%s:%s: %s: %s\n  %s\n"
+        expect = format % (file_name, line_num, category.__name__, message,
+                            file_line)
+        self.assertEqual(expect, self.module.formatwarning(message,
+                                                category, file_name, line_num))
+        # Test the 'line' argument.
+        file_line += " for the win!"
+        expect = format % (file_name, line_num, category.__name__, message,
+                            file_line)
+        self.assertEqual(expect, self.module.formatwarning(message,
+                                    category, file_name, line_num, file_line))
+
+    @test_support.requires_unicode
+    @unittest.skipUnless(test_support.FS_NONASCII, 'need test_support.FS_NONASCII')
+    def test_formatwarning_unicode_msg_nonascii_filename(self):
+        message = u"msg"
+        category = Warning
+        unicode_file_name = test_support.FS_NONASCII + u'.py'
+        file_name = unicode_file_name.encode(sys.getfilesystemencoding())
+        line_num = 3
+        file_line = 'spam'
+        format = "%s:%s: %s: %s\n  %s\n"
+        expect = format % (file_name, line_num, category.__name__, str(message),
+                            file_line)
+        self.assertEqual(expect, self.module.formatwarning(message,
+                                    category, file_name, line_num, file_line))
+        message = u"\xb5sg"
+        expect = format % (unicode_file_name, line_num, category.__name__, message,
+                            file_line)
+        self.assertEqual(expect, self.module.formatwarning(message,
+                                    category, file_name, line_num, file_line))
+
+    @test_support.requires_unicode
+    def test_formatwarning_unicode_msg_nonascii_fileline(self):
+        message = u"msg"
+        category = Warning
+        file_name = 'file.py'
+        line_num = 3
+        file_line = 'sp\xe4m'
+        format = "%s:%s: %s: %s\n  %s\n"
+        expect = format % (file_name, line_num, category.__name__, str(message),
+                            file_line)
+        self.assertEqual(expect, self.module.formatwarning(message,
+                                    category, file_name, line_num, file_line))
+        message = u"\xb5sg"
+        expect = format % (file_name, line_num, category.__name__, message,
+                            unicode(file_line, 'latin1'))
+        self.assertEqual(expect, self.module.formatwarning(message,
+                                    category, file_name, line_num, file_line))
+
     def test_showwarning(self):
         file_name = os.path.splitext(warning_tests.__file__)[0] + '.py'
         line_num = 3