Switch to using the now-working `setup.py test´.

tox.ini

@@ -1,19 +1,10 @@
 [tox]
-envlist = py26,py27,pypy,py32,py33
+envlist = pypy,py26,py27,py32,py33
 
 [testenv]
 setenv =
     # Do not allowed the executing environment to pollute the test environment
     # with extra packages.
     PYTHONPATH=
-
 # The standard library unittest module can run tests on Python 2.7 and newer
-commands = python -m unittest -v OpenSSL.test.test_rand OpenSSL.test.test_crypto OpenSSL.test.test_ssl
-
-[testenv:py26]
-deps =
-    # Twisted doesn't declare this dependency so we have to do it
-    zope.interface
-    twisted
-# On Python 2.6 use a different test runner
-commands = trial OpenSSL
+commands = python setup.py test