remove dependency on old mock (#855)

dev-requirements.txt

@@ -1,6 +1,5 @@
 pytest>=2.5
 sphinx>=1.1,<1.5
 colour>=0.0.5
-mock>=1.0
 pycodestyle>=1.5.7
 i3ipc>=1.2.0

docs/conf.py

@@ -17,7 +17,7 @@
 sys.path.insert(0, os.path.abspath('..'))
 
 # requires PyPI mock
-import mock
+import unittest.mock as mock
 
 MOCK_MODULES = [
     "alsaaudio",

tests/test_hassio.py

@@ -4,7 +4,7 @@
 """
 
 import unittest
-from mock import patch
+from unittest.mock import patch
 from requests import get
 from i3pystatus import hassio
 import json

tests/test_lastfm.py

@@ -3,8 +3,7 @@
 """
 
 import unittest
-from mock import patch
-from unittest.mock import MagicMock
+from unittest.mock import patch, MagicMock
 from urllib.request import urlopen
 from i3pystatus import lastfm
 

tests/test_plexstatus.py

@@ -3,8 +3,7 @@
 """
 
 import unittest
-from mock import patch
-from unittest.mock import MagicMock
+from unittest.mock import patch, MagicMock
 from urllib.request import urlopen
 from i3pystatus import plexstatus