Index: fixtures-4.0.0/fixtures/tests/_fixtures/test_mockpatch.py
===================================================================
--- fixtures-4.0.0.orig/fixtures/tests/_fixtures/test_mockpatch.py
+++ fixtures-4.0.0/fixtures/tests/_fixtures/test_mockpatch.py
@@ -13,7 +13,11 @@
 #    under the License.
 
 
-import mock # Yes, we only test the rolling backport
+try:
+    import mock # Yes, we only test the rolling backport
+except ImportError:
+    import unittest
+    raise unittest.SkipTest("mock not available")
 import testtools
 
 from fixtures import (