diff --git a/tox.ini b/tox.ini
index 8d9475f..a9aa3f0 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,8 @@ skipsdist = True
 [testenv]
 usedevelop = True
 install_command = {toxinidir}/tools/tox_install.sh {env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+whitelist_externals = find
+                      rm
 setenv =
    VIRTUAL_ENV={envdir}
    BRANCH_NAME=master
@@ -21,7 +23,11 @@ commands = flake8
 commands = {posargs}
 
 [testenv:cover]
-commands = python setup.py test --coverage --testr-args='{posargs}'
+commands = 
+  coverage erase
+  find . -type f -name "*.pyc" -delete
+  python setup.py test --coverage --testr-args='{posargs}'
+  coverage report
 
 [testenv:py27]
 commands =
@@ -30,7 +36,8 @@ commands =
     doc8 doc/source
 
 [testenv:docs]
-commands = python setup.py build_sphinx
+commands = rm -rf doc/build
+           python setup.py build_sphinx
 
 [testenv:debug]
 commands = oslo_debug_helper {posargs}