add exported extractor results

test/results/nitterit.py

@@ -0,0 +1,18 @@
+# -*- coding: utf-8 -*-
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+
+from gallery_dl.extractor import nitter
+
+
+__tests__ = (
+{
+    "#url"     : "https://nitter.it/POTUS/status/1639409307878928384",
+    "#category": ("nitter", "nitter.it", "tweet"),
+    "#class"   : nitter.NitterTweetExtractor,
+    "#count"   : 0,
+},
+
+)