Fix unicode error in py2.7 for example plugin

Strings should now be passed to the plugins as unicode values in py2.7
so we have to make sure that we don't convert those into ascii by using
python str instead of u'' strings.

tests/test_rtmbot_core.py

@@ -1,11 +1,12 @@
 # -*- coding: utf-8 -*-
 try:
-    from unittest.mock import Mock
+    from unittest.mock import Mock, create_autospec
 except ImportError:
-    from mock import Mock
+    from mock import Mock, create_autospec
 
 from testfixtures import LogCapture
-from rtmbot.core import RtmBot
+from slackclient import SlackClient, _channel, _server, _util
+from rtmbot.core import RtmBot, Plugin
 
 def init_rtmbot():
     ''' Initializes an instance of RTMBot with some default values '''
@@ -33,14 +34,21 @@ def test_output():
     ''' Test that sending a message behaves as expected '''
     rtmbot = init_rtmbot()
 
-    # Mock the slack_client object
-    slackclient_mock = Mock()
-    channel_mock = Mock()
+    # Mock the slack_client object with Server, Channel objects and needed methods
+    slackclient_mock = create_autospec(SlackClient)
+    server_mock = create_autospec(_server.Server)
+
+    # Mock Server with channels method and correct return value
+    slackclient_mock.server = server_mock
+    searchlist_mock = create_autospec(_util.SearchList)
+    server_mock.channels = searchlist_mock
+    channel_mock = create_autospec(_channel.Channel)
     slackclient_mock.server.channels.find.return_value = channel_mock
+
     rtmbot.slack_client = slackclient_mock
 
     # mock the plugin object to return a sample response
-    plugin_mock = Mock()
+    plugin_mock = create_autospec(Plugin)
     plugin_mock.do_output.return_value = [['C12345678', 'test message']]
     rtmbot.bot_plugins.append(plugin_mock)
 
@@ -50,10 +58,18 @@ def test_output():
     # test that the output matches the expected value
     channel_mock.send_message.assert_called_with('test message')
 
-    # test that unicode messages work as expected
+    # test that emoji messages work as expected
     channel_mock.reset_mock()
     plugin_mock.reset_mock()
     plugin_mock.do_output.return_value = [['C12345678', '🚀 testing']]
     rtmbot.output()
 
     channel_mock.send_message.assert_called_with('🚀 testing')
+
+    # test that unicode messages work as expected
+    channel_mock.reset_mock()
+    plugin_mock.reset_mock()
+    plugin_mock.do_output.return_value = [['C12345678', 'ù hœø3ö']]
+    rtmbot.output()
+
+    channel_mock.send_message.assert_called_with('ù hœø3ö')