add comments to tests, make sure modifying count counts as modifying..

ui/medashare/tags.py

@@ -26,6 +26,7 @@ class TagCache:
 	@count.setter
 	def count(self, v):
 		self._count = v
+		self._modified = True
 
 		self._limit_count()
 
@@ -105,6 +106,7 @@ class _TestTagCache(unittest.TestCase):
 
 		tc.add(('foo', 'foo'))
 
+		# that modified flag is set
 		self.assertTrue(tc.modified)
 
 		tc.add(('bar', 'bar'))
@@ -117,13 +119,17 @@ class _TestTagCache(unittest.TestCase):
 
 		tc.add(('foo', 'foo'))
 
+		# that only the two most recent tags are present
 		self.assertEqual(tc.tags(), [ ('baz', 'baz'), ('foo', 'foo') ])
 
+		# that it can be stored
 		cachefile = self.tempdir / 'somecache'
 		tc.store(cachefile)
 
+		# and it clears the modified flag
 		self.assertFalse(tc.modified)
 
+		# that it can be loaded
 		ntc = TagCache.load(cachefile)
 
 		self.assertFalse(ntc.modified)
@@ -134,16 +140,29 @@ class _TestTagCache(unittest.TestCase):
 
 		self.assertEqual(ntc.tags(), [ ('foo', 'foo'), ('whee', 'whee') ])
 
+		# that when the modified flag is cleared
+		ntc.store(cachefile)
+		ntc = TagCache.load(cachefile)
+
+		# that the count can be modified
 		ntc.count = 3
 
+		# that modified flag is set after count change
+		self.assertTrue(ntc.modified)
+
 		ntc.add(('a', 'a'))
 
 		ntc.add(('b', 'b'))
 
+		# and the count did change
 		self.assertEqual(ntc.tags(), [ ('a', 'a'), ('b', 'b'), ('whee', 'whee') ])
 
+		ntc.store(cachefile)
+
 		ntc.add(('whee', 'whee'))
 
+		# that reducing the count works
 		ntc.count = 2
 
+		# and immediately gets rid of extra tags
 		self.assertEqual(ntc.tags(), [ ('b', 'b'), ('whee', 'whee') ])