1 files changed, 11 insertions, 7 deletions

diff --git a/tox.ini b/tox.ini
index d4a3cf9..757b7d4 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,25 +1,29 @@
 [tox]
 envlist =
-   py27,py34,py35,py36,py37,pypy,pypy3,coverage,docs
+   py27,py35,py36,py37,pypy,pypy3,coverage,docs
 
 [testenv]
 commands =
-    zope-testrunner --test-path=src []
+    zope-testrunner --test-path=src {posargs:-pvc}
     sphinx-build -b doctest -d {envdir}/doctrees docs {envdir}/doctest
-deps =
-    .[test,docs,compile]
+extras =
+    test
+    docs
+    compile
 
 [testenv:coverage]
 usedevelop = true
 basepython =
     python3.6
 commands =
-    coverage run -m zope.testrunner --test-path=src []
-    coverage run -a -m sphinx -b doctest -d {envdir}/.cache/doctrees docs {envdir}/.cache/doctest
+    coverage erase
+    coverage run -p -m zope.testrunner --test-path=src {posargs:-pvc}
+    coverage run -p -m sphinx -b doctest -d {envdir}/.cache/doctrees docs {envdir}/.cache/doctest
+    coverage combine
     coverage report --fail-under=100
 deps =
-    {[testenv]deps}
     coverage
+parallel_show_output = true
 
 [testenv:docs]
 basepython =