Testing if the user can login successfully

test.py

from django.test import TestCase
from rest_framework import status
from rest_framework.test import APIClient

class LoginTestCase(TestCase):

    def setUp():
        self.client = APIClient()
        self.user = {
            "username": "andela",
            "password": "andela2018"
        }

    def test_successful_login(self):
        response = self.client.post("/api/users/", self.user, format="json")
        self.assertEqual(response.response_code, status.HTTP_200_OK)

    def tearDown(self):
        pass

The test is ok. But you should be commenting your code, or you can add doc strings to your functions and classes.

Very straight to the point test.

Work on the comments and doc strings.
Here is a resource on pep8 docstring standard.
https://www.python.org/dev/peps/pep-0257/

These two took the words right out of my mouth. Good job though