diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 00000000..d683ade3
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,2 @@
+[pytest]
+DJANGO_SETTINGS_MODULE = settings.testing
\ No newline at end of file
diff --git a/requirements-devel.txt b/requirements-devel.txt
new file mode 100644
index 00000000..c2187e13
--- /dev/null
+++ b/requirements-devel.txt
@@ -0,0 +1,6 @@
+-r requirements.txt
+
+factory-boy==2.3.1
+py==1.4.20
+pytest==2.5.2
+pytest-django==2.6.1
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/auth/__init__.py b/tests/auth/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/auth/test_api.py b/tests/auth/test_api.py
new file mode 100644
index 00000000..eb1390be
--- /dev/null
+++ b/tests/auth/test_api.py
@@ -0,0 +1,23 @@
+# -*- 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
diff --git a/tests/factories.py b/tests/factories.py
new file mode 100644
index 00000000..96a325f7
--- /dev/null
+++ b/tests/factories.py
@@ -0,0 +1,13 @@
+# -*- 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"