unit_test: marked empty test with FIXXME

tests/unit_tests.py

@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
-# Time-stamp: <2020-06-07 16:20:55 vk>
+# Time-stamp: <2021-04-03 16:16:22 vk>
 
 # invoke tests using following command line:
 # ~/src/vktag % PYTHONPATH="~/src/filetags:" tests/unit_tests.py --verbose
@@ -15,6 +15,7 @@ import platform
 import time  # for sleep()
 from shutil import rmtree
 
+
 # TEMPLATE for debugging:
 #        try:
 #        except AssertionError:
@@ -463,6 +464,7 @@ class TestLocateAndParseControlledVocabulary(unittest.TestCase):
 
     def test_include_lines_in_cv(self):
         """
+        FIXXME!!!!
         This tests does not use the setup from the test class. However, it does use several
         other util functions defined in this class. Therefore, I set up a different test
         case here and re-use the util functions.