This new PyTest 4.1 behavior only passes tests when running each on their process

Author: s0undt3ch

tox.ini

@@ -6,4 +6,5 @@ envlist = py27,py35,py36,py37,pypy
 deps =
   pytest
   coverage
-commands = coverage run -a -m py.test -s -ra {posargs:tests}
+  pytest-forked
+commands = coverage run -a -m py.test -s -ra --forked {posargs:tests}