Add sample name to unittest fail message.

Should help debugging unexpected results.

Author: christian-intra2net

tests/oleid/test_basic.py

@@ -68,7 +68,7 @@ def test_properties(self):
                 self.assertEqual(value_dict['author'],
                                  b'\xb1\xe8\xb1\xe2\xc1\xa4;kijeong')
             elif 'olevba/sample_with_vba.ppt' in filename:
-                print("\nTODO: find reason for different results for olevba/sample_with_vba.ppt")
+                print('\nTODO: find reason for different results for olevba/sample_with_vba.ppt')
                 # on korean test machine, this is the result:
                 # self.assertEqual(value_dict['codepage'],
                 #                  '949: ANSI/OEM Korean (Unified Hangul Code)')
@@ -77,10 +77,14 @@ def test_properties(self):
                 continue
             else:
                 self.assertEqual(value_dict['codepage'],
-                                 '1252: ANSI Latin 1; Western European (Windows)')
+                                 '1252: ANSI Latin 1; Western European (Windows)',
+                                 'Unexpected result {0!r} for codepage of sample {1}'
+                                 .format(value_dict['codepage'], filename))
                 self.assertIn(value_dict['author'],
                               (b'user', b'schulung',
-                               b'xxxxxxxxxxxx', b'zzzzzzzzzzzz'))
+                               b'xxxxxxxxxxxx', b'zzzzzzzzzzzz'),
+                              'Unexpected result {0!r} for author of sample {1}'
+                              .format(value_dict['author'], filename))
 
     def test_encrypted(self):
         """Test indicator "encrypted"."""