diff --git a/fuel_agent/drivers/base.py b/fuel_agent/drivers/base.py
index 9ce4224..77003f9 100644
--- a/fuel_agent/drivers/base.py
+++ b/fuel_agent/drivers/base.py
@@ -13,6 +13,8 @@
 # limitations under the License.
 
 import abc
+import copy
+
 import six
 
 
@@ -25,4 +27,4 @@ class BaseDataDriver(object):
     """
 
     def __init__(self, data):
-        self.data = data
+        self.data = copy.deepcopy(data)
diff --git a/test-requirements.txt b/test-requirements.txt
index 1ad9300..5577c4b 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -2,4 +2,5 @@ hacking>=0.8.0,<0.9
 mock>=1.0
 oslotest==1.0
 testtools>=0.9.34
-testrepository>=0.0.18
+pytest>=2.7.2
+pytest-cov>=1.8.1
diff --git a/tox.ini b/tox.ini
index b54b3fe..7c849fe 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,7 +10,7 @@ setenv = VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands =
-  python setup.py testr --slowest --testr-args='{posargs:}'
+  py.test -vv {posargs:fuel_agent/tests}
 
 [tox:jenkins]
 downloadcache = ~/cache/pip
@@ -23,7 +23,7 @@ commands =
 [testenv:cover]
 setenv = VIRTUAL_ENV={envdir}
 commands =
-  python setup.py testr --coverage {posargs:fuel_agent}
+  py.test --cov fuel_agent {posargs:fuel_agent/tests}
 
 [testenv:venv]
 commands = {posargs:}