Use tox for tests

.gitignore

@@ -3,4 +3,5 @@
 build/
 dist/
 venv/
+.tox/
 m3

README.md

@@ -24,7 +24,7 @@ conf layout.
 
 #. Bootstrap: `./venv/bin/python setup.py dev`
 
-#. Test code base: `./venv/bin/nosetests`
+#. Test code base: `./venv/bin/tox`
 
 #. Check coding style for the whole project `./venv/bin/pylint letsencrypt`,
    or specific module, e.g. `./venv/bin/pylint letsencrypt.client.acme`.

setup.py

@@ -15,6 +15,7 @@ testing_extras = [
     'coverage',
     'nose',
     'pylint',
+    'tox>=1.6',
 ]
 
 setup(

tox.ini

@@ -0,0 +1,14 @@
+# Tox (http://tox.testrun.org/) is a tool for running tests
+# in multiple virtualenvs. This configuration file will run the
+# test suite on all supported python versions. To use it, "pip install tox"
+# and then run "tox" from this directory.
+
+[tox]
+envlist = py26, py27
+
+[testenv]
+# install_command requires tox>=1.6
+install_command = pip install --process-dependency-links {opts} {packages}
+commands = nosetests
+deps =
+    nose