tox.ini: Specify xunit file

tox.ini

@@ -11,26 +11,26 @@ basepython = python2.4
 commands = pip -E {envdir} install -r contrib/requirements/default.txt
            pip -E {envdir} install -r contrib/requirements/py24.txt
            pip -E {envdir} install -r contrib/requirements/test.txt
-           nosetests
+           nosetests --with-xunit --xunit-file=../../nosetests.xml
 
 [testenv:py25]
 basepython = python2.5
 commands = pip -E {envdir} install -r contrib/requirements/default.txt
            pip -E {envdir} install -r contrib/requirements/py25.txt
            pip -E {envdir} install -r contrib/requirements/test.txt
-           nosetests
+           nosetests --with-xunit --xunit-file=../../nosetests.xml
 
 [testenv:py26]
 basepython = python2.6
 commands = pip -E {envdir} install -r contrib/requirements/default.txt
            pip -E {envdir} install -r contrib/requirements/test.txt
-           nosetests
+           nosetests --with-xunit --xunit-file=../../nosetests.xml
 
 [testenv:py27]
 basepython = python2.7
 commands = pip -E {envdir} install -r contrib/requirements/default.txt
            pip -E {envdir} install -r contrib/requirements/test.txt
-           nosetests
+           nosetests --with-xunit --xunit-file=../../nosetests.xml
 
 [testenv:py27-xunit-xmlcover]
 basepython = python2.7