--- a/tox.ini	Thu May 19 14:21:21 2016 +0200
+++ b/tox.ini	Thu Jan 14 17:14:16 2016 +0100
@@ -22,23 +22,24 @@
   sobjects: -r{toxinidir}/cubicweb/sobjects/test/requirements.txt
   web: -r{toxinidir}/cubicweb/web/test/requirements.txt
   wsgi: -r{toxinidir}/cubicweb/wsgi/test/requirements.txt
+  pytest
 commands =
   py34-cubicweb: touch {envdir}/share/cubicweb/cubes/__init__.py
   py34-server: touch {envdir}/share/cubicweb/cubes/__init__.py
   py34-sobjects: touch {envdir}/share/cubicweb/cubes/__init__.py
   py34-web: touch {envdir}/share/cubicweb/cubes/__init__.py
   cubicweb: {envpython} -m pip install --upgrade --no-deps --quiet git+git://github.com/logilab/yapps@master#egg=yapps
-  cubicweb: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/test {posargs}
-  dataimport: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/dataimport/test {posargs}
-  devtools: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/devtools/test {posargs}
-  entities: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/entities/test {posargs}
-  etwist: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/etwist/test {posargs}
-  ext: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/ext/test {posargs}
-  hooks: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/hooks/test {posargs}
-  server: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/server/test {posargs}
-  sobjects: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/sobjects/test {posargs}
-  web: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/web/test {posargs}
-  wsgi: {envpython} -c 'from logilab.common import pytest; pytest.run()' -t {toxinidir}/cubicweb/wsgi/test {posargs}
+  cubicweb: {envpython} -m pytest {toxinidir}/cubicweb/test {posargs}
+  dataimport: {envpython} -m pytest {toxinidir}/cubicweb/dataimport/test {posargs}
+  devtools: {envpython} -m pytest {toxinidir}/cubicweb/devtools/test {posargs}
+  entities: {envpython} -m pytest {toxinidir}/cubicweb/entities/test {posargs}
+  etwist: {envpython} -m pytest {toxinidir}/cubicweb/etwist/test {posargs}
+  ext: {envpython} -m pytest {toxinidir}/cubicweb/ext/test {posargs}
+  hooks: {envpython} -m pytest {toxinidir}/cubicweb/hooks/test {posargs}
+  server: {envpython} -m pytest {toxinidir}/cubicweb/server/test {posargs}
+  sobjects: {envpython} -m pytest {toxinidir}/cubicweb/sobjects/test {posargs}
+  web: {envpython} -m pytest {toxinidir}/cubicweb/web/test {posargs}
+  wsgi: {envpython} -m pytest {toxinidir}/cubicweb/wsgi/test {posargs}
 
 [testenv:doc]
 changedir = doc
@@ -47,3 +48,6 @@
 deps =
   sphinx
 commands = sphinx-build -b html -d {envtmpdir}/doctrees .  {envtmpdir}/html
+
+[pytest]
+python_files = *test_*.py