[tests] Add unittest for seahub

pytest.ini

@@ -1,2 +1,3 @@
 [pytest]
 addopts = -s -v
+DJANGO_SETTINGS_MODULE=seahub.settings

test-requirements.txt

@@ -1,3 +1,4 @@
 selenium==2.42.1
 requests==2.3.0
 pytest
+pytest-django==2.8.0

tests/seahub/test_accounts.py

@@ -0,0 +1,25 @@
+from django.core.urlresolvers import reverse
+from django.test import TestCase
+
+from tests.common.common import BASE_URL, USERNAME, PASSWORD
+
+LOGIN_URL = reverse('auth_login')
+class LoginTest(TestCase):
+    def test_renders_correct_template(self):
+        resp = self.client.get(LOGIN_URL)
+
+        assert resp.status_code == 200
+        self.assertTemplateUsed(resp, 'registration/login.html')
+
+    def test_invalid_password(self):
+        # load it once for test cookie
+        self.client.get(LOGIN_URL)
+
+        resp = self.client.post(LOGIN_URL, {
+            'username': USERNAME,
+            'password': 'fakepasswd',
+        })
+        assert resp.status_code == 200
+        assert resp.context['form'].errors['__all__'] == [
+            u'Please enter a correct username and password. Note that both fields are case-sensitive.'
+        ]