Fix mock use for 1.1.0

Use the correct method name to check the calls to the mock.

Change-Id: Ibd7ab3f0a7f47682592b29cb238f78dae6337ba7

oslo_i18n/tests/test_gettextutils.py

@@ -67,7 +67,7 @@ class GettextTest(test_base.BaseTestCase):
             with mock.patch('gettext.install'):
                 environ_get.return_value = '/foo/bar'
                 _gettextutils.install('blaa')
-                environ_get.assert_calls([mock.call('BLAA_LOCALEDIR')])
+                environ_get.assert_has_calls([mock.call('BLAA_LOCALEDIR')])
 
     def test_gettext_install_updates_builtins(self):
         with mock.patch('os.environ.get') as environ_get:

test-requirements.txt

@@ -7,5 +7,7 @@ hacking<0.11,>=0.10.0
 sphinx!=1.2.0,!=1.3b1,<1.3,>=1.1.2
 oslosphinx>=2.5.0 # Apache-2.0
 
+mock>=1.1;python_version!='2.6'
+mock==1.0.1;python_version=='2.6'
 oslotest>=1.5.1 # Apache-2.0
 coverage>=3.6