run tests against python3 (#39533)

Jenkinsfile

@@ -34,7 +34,7 @@ pipeline {
                         utils.publish_coverage_native('index.html')
                         utils.publish_pylint('pylint.out')
                     }
-                    junit '*_results.xml'
+                    mergeJunitResults()
                 }
             }
         }

tox.ini

@@ -16,7 +16,7 @@
 ; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 [tox]
-envlist = py2-coverage-pylint
+envlist = py2-junit, py3-junit-coverage
 toxworkdir = {env:TMPDIR:/tmp}/tox-{env:USER}/passerelle-atreal-openads/{env:BRANCH_NAME:}
 
 [testenv]
@@ -26,12 +26,13 @@ usedevelop =
 setenv =
   DJANGO_SETTINGS_MODULE=passerelle.settings
   PASSERELLE_SETTINGS_FILE=tests/settings.py
-  coverage: COVERAGE=--junitxml=test_results.xml --cov-report xml --cov-report html --cov=atreal_openads/
+  coverage: COVERAGE=--cov-report xml --cov-report html --cov=atreal_openads/
+  junit: JUNIT=--junitxml=junit-{envname}.xml
 deps =
   http://git.entrouvert.org/passerelle.git/snapshot/passerelle-master.tar.gz
   pytest-cov
   pytest-django
-  pytest>=3.3.0,<4
+  pytest>=3.3.0
   WebTest
   mock
   httmock
@@ -40,5 +41,5 @@ deps =
   django-webtest<1.9.3
   xmlschema<1.1
 commands =
-  py.test {env:COVERAGE:} {posargs:tests/}
-  pylint: ./pylint.sh atreal_openads/
+  py.test {posargs: {env:COVERAGE:} {env:JUNIT:} tests/}
+  coverage: ./pylint.sh atreal_openads/