test_app.py

from django.test import Client, TestCase

class TestLogin(TestCase):

    def setUp(self):
        self.client = Client()
        self.data = {
            'username' : 'joshua',
            'email' : 'joshua@me.com',
            'password' : 'qwerty'
        }

    def test_login_user(self):
        """test user login with correct credentials"""
        response = self.client.post('users/login', self.data)
        self.assertEqual(response.status_code, 200)