Patch by Christian Heimes to change self.assert_(x == y) into
self.assertEqual(x, y).  (Christian used self.failUnlessEqual(),
but the double negative makes it hard to grok, so I changed it.)
diff --git a/Lib/test/test_filecmp.py b/Lib/test/test_filecmp.py
index 503562b..53b949d 100644
--- a/Lib/test/test_filecmp.py
+++ b/Lib/test/test_filecmp.py
@@ -103,28 +103,28 @@
             self.assertEqual([d.left_list, d.right_list],[['file'], ['FiLe']])
         else:
             self.assertEqual([d.left_list, d.right_list],[['file'], ['file']])
-        self.failUnless(d.common == ['file'])
+        self.assertEqual(d.common, ['file'])
         self.failUnless(d.left_only == d.right_only == [])
-        self.failUnless(d.same_files == ['file'])
-        self.failUnless(d.diff_files == [])
+        self.assertEqual(d.same_files, ['file'])
+        self.assertEqual(d.diff_files, [])
 
         # Check attributes for comparison of two different directories
         d = filecmp.dircmp(self.dir, self.dir_diff)
-        self.failUnless(d.left_list == ['file'])
+        self.assertEqual(d.left_list, ['file'])
         self.failUnless(d.right_list == ['file', 'file2'])
-        self.failUnless(d.common == ['file'])
-        self.failUnless(d.left_only == [])
-        self.failUnless(d.right_only == ['file2'])
-        self.failUnless(d.same_files == ['file'])
-        self.failUnless(d.diff_files == [])
+        self.assertEqual(d.common, ['file'])
+        self.assertEqual(d.left_only, [])
+        self.assertEqual(d.right_only, ['file2'])
+        self.assertEqual(d.same_files, ['file'])
+        self.assertEqual(d.diff_files, [])
 
         # Add different file2
         output = open(os.path.join(self.dir, 'file2'), 'w')
         output.write('Different contents.\n')
         output.close()
         d = filecmp.dircmp(self.dir, self.dir_diff)
-        self.failUnless(d.same_files == ['file'])
-        self.failUnless(d.diff_files == ['file2'])
+        self.assertEqual(d.same_files, ['file'])
+        self.assertEqual(d.diff_files, ['file2'])
 
 
 def test_main():