diff --git a/requirements-test.txt b/requirements-test.txt
new file mode 100644
index 0000000..fd3bd90
--- /dev/null
+++ b/requirements-test.txt
@@ -0,0 +1,6 @@
+flake8
+flake8-copyright
+isort
+pep8<1.6
+coverage
+
diff --git a/tox.ini b/tox.ini
index 0e59285..d39d777 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,19 @@
 [tox]
-envlist = py27,py34,py35,py36
+envlist = flake8, isort, py27,py34,py35,py36
 
 [testenv]
-commands = python -m unittest discover
+deps =
+    -r{toxinidir}/requirements-test.txt
+commands =
+    coverage erase
+    coverage run -m unittest discover
+    coverage report --fail-under=75 --omit=.tox/*,/usr/*
+
+[testenv:flake8]
+commands=
+    flake8
+
+[testenv:isort]
+commands=
+    isort --check-only --recursive --diff num2words tests
+