Remove pytest runner to run test (#714)

This was the case already when running test manually but
not when running tox or travis

requirements-development.txt

@@ -14,4 +14,3 @@ pytest-factoryboy==2.0.3
 recommonmark==0.6.0
 Sphinx==2.2.0
 sphinx_rtd_theme==0.4.3
-twine==2.0.0

setup.py

@@ -7,13 +7,6 @@
 
 from setuptools import setup
 
-needs_pytest = {'pytest', 'test', 'ptr'}.intersection(sys.argv)
-pytest_runner = ['pytest-runner'] if needs_pytest else []
-needs_sphinx = {'build_sphinx', 'upload_docs'}.intersection(sys.argv)
-sphinx = ['sphinx'] if needs_sphinx else []
-needs_wheel = {'bdist_wheel'}.intersection(sys.argv)
-wheel = ['wheel'] if needs_wheel else []
-
 
 def read(*paths):
     """
@@ -97,16 +90,6 @@ def get_package_data(package):
         'djangorestframework>=3.10',
         'django>=1.11',
     ],
-    setup_requires=pytest_runner + sphinx + wheel,
-    tests_require=[
-        'pytest-factoryboy',
-        'factory-boy',
-        'pytest-django',
-        'pytest',
-        'pytest-cov',
-        'django-polymorphic>=2.0',
-        'django-filter>=2.0',
-        'django-debug-toolbar==1.11'
-    ],
+    python_requires=">=3.5",
     zip_safe=False,
 )

tox.ini

@@ -10,20 +10,23 @@ deps =
     django22: Django>=2.2,<2.3
     drf310: djangorestframework>=3.10.2,<3.11
     drfmaster: https://github.com/encode/django-rest-framework/archive/master.zip
+    -rrequirements-development.txt
 
 setenv =
     PYTHONPATH = {toxinidir}
     DJANGO_SETTINGS_MODULE=example.settings.test
 
 commands =
-    python setup.py test --addopts '--cov --no-cov-on-fail --cov-report xml' {posargs}
+    pytest --cov --no-cov-on-fail --cov-report xml {posargs}
 
 [testenv:flake8]
+basepython = python3.6
 deps =
     -rrequirements-development.txt
 commands = flake8
 
 [testenv:sphinx]
+basepython = python3.6
 deps =
     -rrequirements-development.txt
 commands =