Add current tox.ini directory to PYTHONPATH in order to use imports form there

Fix regression on PY3 caused by unicode_literals

Author: leo-naeka

example/factories/__init__.py

@@ -1,5 +1,4 @@
 # -*- encoding: utf-8 -*-
-from __future__ import unicode_literals
 
 import factory
 from faker import Factory as FakerFactory
@@ -22,8 +21,7 @@ class Meta:
     name = factory.LazyAttribute(lambda x: faker.name())
     email = factory.LazyAttribute(lambda x: faker.email())
 
-    bio = factory.RelatedFactory(b'example.factories.AuthorBioFactory', 'author')
-
+    bio = factory.RelatedFactory('example.factories.AuthorBioFactory', 'author')
 
 class AuthorBioFactory(factory.django.DjangoModelFactory):
     class Meta:

tox.ini

@@ -14,7 +14,9 @@ deps =
     drf33: djangorestframework>=3.3,<3.4
     -r{toxinidir}/requirements-development.txt
 
-setenv= DJANGO_SETTINGS_MODULE=example.settings.test
+setenv =
+    PYTHONPATH = {toxinidir}
+    DJANGO_SETTINGS_MODULE=example.settings.test
 
 commands =
     py.test --basetemp={envtmpdir}