itag test coverage

tests/test_itags.py

@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+from pytube import itags
+
+
+def test_get_format_profile():
+    profile = itags.get_format_profile(22)
+    assert profile['resolution'] == '720p'
+
+
+def test_get_format_profile_non_existant():
+    profile = itags.get_format_profile(2239)
+    assert profile['resolution'] is None