added testcases for Tag and TagLine classes

chatmastermind/tags.py

@@ -113,16 +113,14 @@ class TagLine(str):
         Note that it's sufficient if the TagLine matches one of 'tags_or' or 'tags_and',
         i. e. you can select a TagLine if it either contains one of the tags in 'tags_or'
         or all of the tags in 'tags_and' but it must never contain any of the tags in
-        'tags_not'. If a given tag set is 'None', it matches all tags.
+        'tags_not'.
         """
         tag_set = self.tags()
         required_tags_present = False
         excluded_tags_missing = False
-        if ((tags_or is None and tags_and is None)
-           or (tags_or and any(tag in tag_set for tag in tags_or))   # noqa: W503
+        if ((tags_or and any(tag in tag_set for tag in tags_or))
            or (tags_and and all(tag in tag_set for tag in tags_and))):  # noqa: W503
             required_tags_present = True
-        if ((tags_not is None)
-           or (not any(tag in tag_set for tag in tags_not))):  # noqa: W503
+        if not any(tag in tag_set for tag in tags_not):
             excluded_tags_missing = True
         return required_tags_present and excluded_tags_missing

tests/test_main.py

@@ -333,7 +333,7 @@ class TestTagLine(CmmTestCase):
         self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))
 
         # Test case 7: Some tags in 'tags_not' are present
-        tags_or = {Tag('tag1')}
+        tags_or = set()
         tags_and = set()
         tags_not = {Tag('tag2')}
         self.assertFalse(tagline.match_tags(tags_or, tags_and, tags_not))