Package 'mock' is required for testing, and for Python < 3.3 only.

requirements.txt

@@ -41,4 +41,3 @@ sqlparse==0.1.19
 Werkzeug==0.9.6
 WTForms==2.0.2
 backports.csv==1.0.4; python_version <= '2.7'
-mock===2.0.0; python_version < '3.3'

web/regression/requirements.txt

@@ -4,7 +4,7 @@ testscenarios==0.5.0
 testtools==2.0.0
 traceback2==1.4.0
 unittest2==1.1.0
-mock~=2.0.0
+mock===2.0.0; python_version < '3.3'
 
 # Leave this at the end because there is a bug where the '--install-option' is applied to all subsequent requirements
 chromedriver_installer==0.0.6 --install-option='--chromedriver-version=2.29'