+         (add-after 'install 'post-install-check
+           ;; 'setup.py test' does not run tests
+           (lambda* (#:key inputs outputs #:allow-other-keys)
+             (let ((out (assoc-ref outputs "out")))
+               (setenv "PYTHONPATH"
+                       (string-append
+                        (getenv "PYTHONPATH")
+                        ":"
+                        out
+                        "/lib/python"
+                        (string-take (string-take-right
+                                      (assoc-ref inputs "python") 5) 3)
+                        "/site-packages"))
+               (zero?
+                (system*
+                 (string-append out "/bin/py.test") "test_pep8.py"))))))))