tests: use mock from pypi

Author: Mathieu

tests/base.py

@@ -6,24 +6,13 @@
 
 import httplib2
 
-from . import mock
+import mock
 
 import shotgun_api3 as api
 from shotgun_api3.shotgun import json
 from shotgun_api3.shotgun import ServerCapabilities
 import urllib.error
 
-try:
-    # Attempt to import skip from unittest.  Since this was added in Python 2.7
-    # in the case that we're running on Python 2.6 we'll need a decorator to
-    # provide some equivalent functionality.
-    from unittest import skip
-except ImportError:
-    # On Python 2.6 we'll just have to ignore tests that are skipped -- we won't
-    # mark them as skipped, but we will not fail on them.
-    def skip(f):
-        return lambda self: None
-
 
 class TestBase(unittest.TestCase):
     '''Base class for tests.

tests/ci_requirements.txt

@@ -18,4 +18,5 @@ flake8
 pytest
 pytest-azurepipelines
 coverage
-pytest-coverage
+pytest-coverage
+mock