Run tests via pytest

setup.py

@@ -30,7 +30,6 @@ setup(author="Roman Dobosz, Szymon Datko",
       keywords='ferrit',
       name='ferrit',
       packages=find_packages(include=['ferrit', 'ferrit.*']),
-      test_suite='tests',
       url='https://github.com/gryf/ferrit',
       version='0.0.1',
       zip_safe=False)

tox.ini

@@ -4,7 +4,8 @@ envlist = py36,py37,flake8
 [testenv]
 usedevelop=True
 deps = requests
-commands = python setup.py test
+    pytest
+commands = pytest
 
 [testenv:flake8]
 basepython = python3