diff --git a/.gitignore b/.gitignore
index 7904e8a..6317d70 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,4 @@
 __pycache__/
 .tox/
 *.pyc
+.cache/
diff --git a/dev-requirements.txt b/dev-requirements.txt
new file mode 100644
index 0000000..bd253fe
--- /dev/null
+++ b/dev-requirements.txt
@@ -0,0 +1 @@
+pytest==3.0.7
diff --git a/tox.ini b/tox.ini
index be8a318..2adf554 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,5 +1,7 @@
 [tox]
 envlist = py26,py27,py33,py34,py35
 [testenv]
+deps = -r{toxinidir}/dev-requirements.txt
 commands=
     python ./test/test.py
+    py.test test