diff --git a/core/src/cgcloud/core/__init__.py b/core/src/cgcloud/core/__init__.py
index 6b46c29..31714dd 100644
--- a/core/src/cgcloud/core/__init__.py
+++ b/core/src/cgcloud/core/__init__.py
@@ -48,4 +48,3 @@ def command_classes( ):
     return __fail_deprecated( sorted( locals( ).values( ), key=lambda cls: cls.__name__ ) )
 
 
-test_namespace_suffix_length = 11
diff --git a/core/src/cgcloud/core/test/__init__.py b/core/src/cgcloud/core/test/__init__.py
index b049c44..5720289 100644
--- a/core/src/cgcloud/core/test/__init__.py
+++ b/core/src/cgcloud/core/test/__init__.py
@@ -1,63 +1,25 @@
 import os
 import sys
-import time
 from contextlib import contextmanager
 from itertools import ifilter
-from struct import pack
 from tempfile import mkstemp
-from unittest import TestCase
 
 import subprocess32
-from bd2k.util.d64 import D64
 from bd2k.util.iterables import concat
-from boto.utils import get_instance_metadata, logging
+from boto.utils import logging
 
-from cgcloud.core import test_namespace_suffix_length
 from cgcloud.core.cli import main, CGCloud
-from cgcloud.lib import aws_d64
-from cgcloud.lib.context import Context
-from cgcloud.lib.ec2 import running_on_ec2
+from cgcloud.lib.test import CgcloudTestCase
 
 log = logging.getLogger( __name__ )
 
 
-
-class CgcloudTestCase( TestCase ):
-    """
-    A base class for CGCloud test cases. When run with CGCLOUD_NAMESPACE unset, a new test
-    namespace will be prepared during setup and cleaned up during teardown. Otherwise,
-    the configured namespace will be used and not
-    """
-    cleanup = True
-    ctx = None
-    __namespace = None
-
+class CoreTestCase( CgcloudTestCase ):
     @classmethod
     def setUpClass( cls ):
         CGCloud.setup_logging( )
         CGCloud.silence_boto_and_paramiko( )
-        super( CgcloudTestCase, cls ).setUpClass( )
-        if running_on_ec2( ):
-            os.environ.setdefault( 'CGCLOUD_ZONE',
-                                   get_instance_metadata( )[ 'placement' ][ 'availability-zone' ] )
-        # Using the d64 of a binary string that starts with a 4-byte, big-endian time stamp
-        # yields compact names whose lexicographical sorting is consistent with the historical
-        # order. We add the process ID so we can run tests concurrently in child processes using
-        # the pytest-xdist plugin.
-        suffix = aws_d64.encode( pack( '>II', int( time.time( ) ), os.getpid( ) ) )
-        assert len( suffix ) == test_namespace_suffix_length
-        cls.__namespace = '/test/%s/' % suffix
-        os.environ.setdefault( 'CGCLOUD_NAMESPACE', cls.__namespace )
-        cls.ctx = Context( os.environ[ 'CGCLOUD_ZONE' ], os.environ[ 'CGCLOUD_NAMESPACE' ] )
-
-    @classmethod
-    def tearDownClass( cls ):
-        # Only cleanup if the context is using the default test namespace. If another namespace
-        # is configured, we can't assume that all resources were created by the test and that
-        # they can therefore be removed.
-        if cls.cleanup and cls.ctx.namespace == cls.__namespace:
-            cls.ctx.reset_namespace_security( )
-        super( CgcloudTestCase, cls ).tearDownClass( )
+        super( CoreTestCase, cls ).setUpClass( )
 
     ssh_opts = ('-o', 'UserKnownHostsFile=/dev/null', '-o', 'StrictHostKeyChecking=no')
 
@@ -107,8 +69,9 @@ def _cgcloud( cls, *args ):
         else:
             main( args )
 
+
 @contextmanager
-def out_stderr():
+def out_stderr( ):
     with open( os.devnull, 'a' ) as f:
         f, sys.stderr = sys.stderr, f
         try:
diff --git a/core/src/cgcloud/core/test/test_core.py b/core/src/cgcloud/core/test/test_core.py
index 735dbae..17da377 100644
--- a/core/src/cgcloud/core/test/test_core.py
+++ b/core/src/cgcloud/core/test/test_core.py
@@ -4,12 +4,12 @@
 from bd2k.util.exceptions import panic
 
 from cgcloud.core import roles
-from cgcloud.core.test import CgcloudTestCase, out_stderr
+from cgcloud.core.test import CoreTestCase, out_stderr
 
 log = logging.getLogger( __name__ )
 
 
-class CoreTests( CgcloudTestCase ):
+class CoreTests( CoreTestCase ):
     """
     Tests the typical life-cycle of instances and images
     """
diff --git a/jenkins/src/cgcloud/jenkins/cgcloud_jenkins_slave.py b/jenkins/src/cgcloud/jenkins/cgcloud_jenkins_slave.py
index c7807a5..0cab01d 100644
--- a/jenkins/src/cgcloud/jenkins/cgcloud_jenkins_slave.py
+++ b/jenkins/src/cgcloud/jenkins/cgcloud_jenkins_slave.py
@@ -1,6 +1,6 @@
-from cgcloud.core import test_namespace_suffix_length
 from cgcloud.core.common_iam_policies import ec2_full_policy
 from cgcloud.core.ubuntu_box import Python27UpdateUbuntuBox
+from cgcloud.lib import test_namespace_suffix_length
 from cgcloud.lib.util import abreviated_snake_case_class_name
 
 from cgcloud.jenkins.generic_jenkins_slaves import UbuntuTrustyGenericJenkinsSlave
diff --git a/lib/src/cgcloud/lib/__init__.py b/lib/src/cgcloud/lib/__init__.py
index 05d31ed..e632ee7 100644
--- a/lib/src/cgcloud/lib/__init__.py
+++ b/lib/src/cgcloud/lib/__init__.py
@@ -1,3 +1,5 @@
 from bd2k.util.d64 import D64
 
 aws_d64 = D64( '.-' )  # hopefully the dot is supported for all AWS resource names
+
+test_namespace_suffix_length = 11
diff --git a/lib/src/cgcloud/lib/test/__init__.py b/lib/src/cgcloud/lib/test/__init__.py
new file mode 100644
index 0000000..3f66433
--- /dev/null
+++ b/lib/src/cgcloud/lib/test/__init__.py
@@ -0,0 +1,47 @@
+import os
+import time
+from struct import pack
+from unittest import TestCase
+
+from boto.utils import get_instance_metadata
+
+from cgcloud.lib import aws_d64, test_namespace_suffix_length
+from cgcloud.lib.context import Context
+from cgcloud.lib.ec2 import running_on_ec2
+
+
+class CgcloudTestCase( TestCase ):
+    """
+    A base class for CGCloud test cases. When run with CGCLOUD_NAMESPACE unset, a new test
+    namespace will be prepared during setup and cleaned up during teardown. Otherwise,
+    the configured namespace will be used but not cleaned up.
+    """
+    __namespace = None
+    cleanup = True
+    ctx = None
+
+    @classmethod
+    def setUpClass( cls ):
+        super( CgcloudTestCase, cls ).tearDownClass( )
+        if running_on_ec2( ):
+            os.environ.setdefault( 'CGCLOUD_ZONE',
+                                   get_instance_metadata( )[ 'placement' ][ 'availability-zone' ] )
+        # Using the d64 of a binary string that starts with a 4-byte, big-endian time stamp
+        # yields compact names whose lexicographical sorting is consistent with the historical
+        # order. We add the process ID so we can run tests concurrently in child processes using
+        # the pytest-xdist plugin.
+        suffix = aws_d64.encode( pack( '>II', int( time.time( ) ), os.getpid( ) ) )
+        assert len( suffix ) == test_namespace_suffix_length
+        cls.__namespace = '/test/%s/' % suffix
+        os.environ.setdefault( 'CGCLOUD_NAMESPACE', cls.__namespace )
+        cls.ctx = Context( availability_zone=os.environ[ 'CGCLOUD_ZONE' ],
+                           namespace=os.environ[ 'CGCLOUD_NAMESPACE' ] )
+
+    @classmethod
+    def tearDownClass( cls ):
+        # Only cleanup if the context is using the default test namespace. If another namespace
+        # is configured, we can't assume that all resources were created by the test and that
+        # they can therefore be removed.
+        if cls.cleanup and cls.ctx.namespace == cls.__namespace:
+            cls.ctx.reset_namespace_security( )
+        super( CgcloudTestCase, cls ).setUpClass( )
diff --git a/mesos/src/cgcloud/mesos/test/__init__.py b/mesos/src/cgcloud/mesos/test/__init__.py
index 09f922d..5da04d1 100644
--- a/mesos/src/cgcloud/mesos/test/__init__.py
+++ b/mesos/src/cgcloud/mesos/test/__init__.py
@@ -1,10 +1,10 @@
 import time
 
-from cgcloud.core.test import CgcloudTestCase
+from cgcloud.core.test import CoreTestCase
 from cgcloud.mesos.mesos_box import log_dir
 
 
-class MesosTestCase( CgcloudTestCase ):
+class MesosTestCase( CoreTestCase ):
     """
     Common functionality between Toil and Mesos tests
     """
diff --git a/spark/src/cgcloud/spark/test/test_spark.py b/spark/src/cgcloud/spark/test/test_spark.py
index 31a3aff..3f7acb8 100644
--- a/spark/src/cgcloud/spark/test/test_spark.py
+++ b/spark/src/cgcloud/spark/test/test_spark.py
@@ -5,7 +5,7 @@
 import logging
 import unittest
 
-from cgcloud.core.test import CgcloudTestCase
+from cgcloud.core.test import CoreTestCase
 from cgcloud.spark.spark_box import install_dir, SparkBox, SparkMaster, SparkSlave
 
 log = logging.getLogger( __name__ )
@@ -17,7 +17,7 @@
 num_slaves = 2
 
 
-class SparkClusterTests( CgcloudTestCase ):
+class SparkClusterTests( CoreTestCase ):
     """
     Covers the creation of a Spark cluster from scratch and running a simple Spark job on it.
     Also covers persistant HDFS between two cluster incarnations.