diff --git a/requirements/test-jython.txt b/requirements/test-jython.txt
index acdebde6..8931aca4 100644
--- a/requirements/test-jython.txt
+++ b/requirements/test-jython.txt
@@ -2,4 +2,5 @@ nose
 nose-cover3
 unittest2>=0.5.0
 coverage>=3.0
+mock>=0.7.0
 simplejson
diff --git a/requirements/test-py3k.txt b/requirements/test-py3k.txt
index a2cb81a6..87e69702 100644
--- a/requirements/test-py3k.txt
+++ b/requirements/test-py3k.txt
@@ -2,3 +2,4 @@ distribute
 nose
 nose-cover3
 coverage>=3.0
+mock>=0.7.0
diff --git a/requirements/test-pypy.txt b/requirements/test-pypy.txt
index a06af83e..c0af83aa 100644
--- a/requirements/test-pypy.txt
+++ b/requirements/test-pypy.txt
@@ -2,5 +2,6 @@ nose
 nose-cover3
 unittest2>=0.5.0
 coverage>=3.0
+mock>=0.7.0
 simplejson
 PyYAML==3.09  # 3.10 dropped 2.4 support
diff --git a/requirements/test.txt b/requirements/test.txt
index 70a654bf..2c80d83a 100644
--- a/requirements/test.txt
+++ b/requirements/test.txt
@@ -2,6 +2,7 @@ nose
 nose-cover3
 unittest2>=0.5.0
 coverage>=3.0
+mock>=0.7.0
 simplejson
 PyYAML==3.09  # 3.10 dropped 2.4 support
 msgpack-python==0.1.6  # 0.1.7 dropped 2.4 support