New tests skeleton and examples using pytest

Instructions (from the project root):
1. pip install -r requirements-devel.txt
2. py.test

pytest.ini

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+[pytest]
+DJANGO_SETTINGS_MODULE = settings.testing

requirements-devel.txt

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+-r requirements.txt
+
+factory-boy==2.3.1
+py==1.4.20
+pytest==2.5.2
+pytest-django==2.6.1

tests/auth/test_api.py

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+# -*- coding: utf-8 -*-
+import pytest
+from unittest import mock
+
+from rest_framework.reverse import reverse
+
+from ..factories import DomainFactory
+
+pytestmark = pytest.mark.django_db
+
+
+def setup_module(module):
+    module.patcher = mock.patch("taiga.domains.base.get_default_domain", DomainFactory.build)
+    module.patcher.start()
+
+
+def teardown_module(module):
+    module.patcher.stop()
+
+
+def test_respond_400_if_credentials_are_invalid(client):
+    response = client.post(reverse("auth-list"), {"username": "john", "password": "smith"})
+    assert response.status_code == 400

tests/factories.py

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+# -*- coding: utf-8 -*-
+import factory
+
+from taiga.domains import models
+
+
+class DomainFactory(factory.DjangoModelFactory):
+    FACTORY_FOR = models.Domain
+
+    public_register = False
+    scheme = None
+    name = "localhost"
+    domain = "localhost"