diff --git a/tests/test_shells.py b/tests/test_shells.py
index b00cfab4..449496c9 100644
--- a/tests/test_shells.py
+++ b/tests/test_shells.py
@@ -75,4 +75,4 @@ class TestZsh(object):
                      return_value=1430707243.3517463)
         shells.Zsh().put_to_history('ls')
         builtins_open.return_value.__enter__.return_value. \
-            write.assert_called_once_with(': 1430707243:0;ls\n')
\ No newline at end of file
+            write.assert_called_once_with(': 1430707243:0;ls\n')
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 00000000..46cf1c17
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,6 @@
+[tox]
+envlist = py27,py33,py34
+
+[testenv]
+deps = -rrequirements.txt
+commands = py.test