Add server NotFound test

Author: jjlawren

tests/test_server.py

@@ -85,6 +85,11 @@ def _detect_color_image(file, thumb_size=150, MSE_cutoff=22, adjust_color_bias=T
         return 'blackandwhite'
 
 
+def test_server_fetchitem_notfound(plex):
+    with pytest.raises(NotFound):
+        plex.fetchItem(123456789)
+
+
 def test_server_search(plex, movie):
     title = movie.title
     assert plex.search(title)