curds: Add a less than operator for playlists

Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>

curds/playlist/playlist.py

@@ -22,6 +22,9 @@ class Playlist():
     def __len__(self):
         return len(self.list)
 
+    def __lt__(self, other):
+        return self.name < other.name
+
     def __str__(self):
         l = len(self.list)
         return f"{self.name}\n{l} Track{'s' if l != 1 else ''}"

curds/playlist/test_playlist.py

@@ -204,3 +204,10 @@ class TestPlaylist(unittest.TestCase):
 
         for i in range(len(plist)):
             self.assertEqual(plist[i], tracks[i])
+
+    def test_playlist_less_than(self):
+        a = playlist.Playlist("A")
+        b = playlist.Playlist("B")
+        self.assertTrue( a < b)
+        self.assertFalse(b < a)
+        self.assertFalse(a < a)