diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_parse.py b/tests/test_parse.py
new file mode 100644
index 0000000..4daeebb
--- /dev/null
+++ b/tests/test_parse.py
@@ -0,0 +1,12 @@
+# -*- coding: utf-8 -*-
+
+import unittest
+
+
+class TestParse(unittest.TestCase):
+    def test_dummy(self):
+        self.assertTrue(True)
+
+
+if __name__ == '__main__':
+    unittest.main()
diff --git a/tox.ini b/tox.ini
index 8026422..1642acd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,8 +2,11 @@
 envlist = py, rst-lint, docs
 
 [testenv]
-commands = python3 -m bio2bel_chebi deploy
-passenv = ARTY_USERNAME ARTY_PASSWORD
+commands = coverage run -p -m pytest --durations=20 tests {posargs}
+whitelist_externals =
+    /bin/cat
+    /bin/cp
+    /bin/mkdir
 
 [testenv:rst-lint]
 commands = rst-lint README.rst
@@ -24,3 +27,7 @@ commands =
     sphinx-build -W -b coverage -d {envtmpdir}/build/doctrees {envtmpdir}/source {envtmpdir}/build/coverage
     cat {envtmpdir}/build/coverage/c.txt
     cat {envtmpdir}/build/coverage/python.txt
+
+[testenv:deploy]
+commands = python3 -m bio2bel_chebi deploy
+passenv = ARTY_USERNAME ARTY_PASSWORD