diff --git a/.testr.conf b/.testr.conf
new file mode 100644
index 0000000..801646b
--- /dev/null
+++ b/.testr.conf
@@ -0,0 +1,8 @@
+[DEFAULT]
+test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
+             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
+             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
+             ${PYTHON:-python} -m subunit.run discover -t ./ ./unit_tests $LISTOPT $IDOPTION
+
+test_id_option=--load-list $IDFILE
+test_list_option=--list
diff --git a/tox.ini b/tox.ini
index 00c1bba..54de270 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,7 @@
 [tox]
 skipsdist = True
-envlist = pep8
+envlist = pep8,py34,py35
+skip_missing_interpreters = True
 
 [testenv]
 basepython = python2.7
@@ -25,3 +26,18 @@ commands = {posargs}
 
 [testenv:pep8]
 commands = flake8 {posargs} src/reactive src/lib
+
+[testenv:py27]
+basepython = python2.7
+deps = -r{toxinidir}/test-requirements.txt
+commands = ostestr {posargs}
+
+[testenv:py34]
+basepython = python3.4
+deps = -r{toxinidir}/test-requirements.txt
+commands = ostestr {posargs}
+
+[testenv:py35]
+basepython = python3.5
+deps = -r{toxinidir}/test-requirements.txt
+commands = ostestr {posargs}