add test reminders

Author: rawdigits

_pytest/test_channel.py

@@ -1,4 +1,9 @@
 from slackclient._channel import Channel
+import pytest
 
-def test_channel(channel):
+def test_Channel(channel):
     assert type(channel) == Channel
+
+@pytest.mark.xfail
+def test_Channel_send_message(channel):
+    channel.send_message('hi')