Fix coverage reports.

Author: jhgg

tox.ini

@@ -2,6 +2,8 @@
 envlist = flake8,import-order,py35,py27,py33,py34,pypy
 
 [testenv]
+whitelist_externals =
+    dir
 deps =
     pytest>=2.7.2
     graphql-core>=0.4.7b0
@@ -10,12 +12,12 @@ deps =
     py{py,27,33}: enum34
     py{py,27,33,34}: singledispatch
 commands =
-    py{py,27,33,34,35}: py.test --cov {envsitepackagesdir}/epoxy tests {posargs}
+    py{py,27,33,34,35}: bash -c "cd {envsitepackagesdir} && py.test --cov=epoxy {toxinidir}/tests"
 
 
 [testenv:flake8]
 deps = flake8
-commands = flake8
+commands = flake8 epoxy
 
 [testenv:import-order]
 basepython=python3.5