diff --git a/tox.ini b/tox.ini
index ae1b11e..04b845a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,24 +3,16 @@
 
 [testenv]
 setenv = VIRTUAL_ENV={envdir}
-         NOSE_WITH_OPENSTACK=1
-         NOSE_OPENSTACK_COLOR=1
-         NOSE_OPENSTACK_RED=15
-         NOSE_OPENSTACK_YELLOW=3
-         NOSE_OPENSTACK_SHOW_ELAPSED=1
-         NOSE_OPENSTACK_STDOUT=1
+         LANG=en_US.UTF-8
+         LANGUAGE=en_US:en
+         LC_ALL=C
 
 [testenv:all]
 sitepackages = True
 setenv = VIRTUAL_ENV={envdir}
-         NOSE_WITH_OPENSTACK=1
-         NOSE_OPENSTACK_COLOR=1
-         NOSE_OPENSTACK_RED=15
-         NOSE_OPENSTACK_YELLOW=3
-         NOSE_OPENSTACK_SHOW_ELAPSED=1
-         NOSE_OPENSTACK_STDOUT=1
 commands =
-  nosetests --logging-format '%(asctime)-15s %(message)s' --with-xunit --xunit-file=nosetests-all.xml -sv tempest
+  python setup.py testr --slowest
+
 
 [testenv:full]
 sitepackages = True
@@ -34,6 +26,12 @@
 commands =
   nosetests --logging-format '%(asctime)-15s %(message)s' --with-xunit --xunit-file=nosetests-full.xml -sv tempest/api tempest/scenario tempest/thirdparty tempest/cli
 
+[testenv:testr-full]
+sitepackages = True
+setenv = VIRTUAL_ENV={envdir}
+commands =
+  python setup.py testr --slowest --testr-args='tempest.api tempest.scenario tempest.thirdparty tempest.cli'
+
 [testenv:smoke]
 sitepackages = True
 setenv = VIRTUAL_ENV={envdir}
@@ -46,7 +44,6 @@
 commands =
    nosetests --logging-format '%(asctime)-15s %(message)s' --with-xunit -sv --attr=type=smoke --xunit-file=nosetests-smoke.xml tempest
 
-
 [testenv:coverage]
 sitepackages = True
 setenv = VIRTUAL_ENV={envdir}