Fix ImportError

Author: jpadilla

tests/test_authentication.py

@@ -1,6 +1,7 @@
+import unittest
+
 from django.http import HttpResponse
 from django.test import TestCase
-from django.utils import unittest
 from django.conf.urls import patterns
 
 from rest_framework import permissions, status

tests/test_serializers.py

@@ -1,8 +1,8 @@
+import unittest
 from distutils.version import StrictVersion
 
 import rest_framework
 from django.test import TestCase
-from django.utils import unittest
 
 from rest_framework_jwt.compat import get_user_model
 from rest_framework_jwt.serializers import JSONWebTokenSerializer

tests/test_views.py

@@ -1,10 +1,10 @@
+import unittest
 from calendar import timegm
 from datetime import datetime, timedelta
 
 from django import get_version
 from django.test import TestCase
 from django.test.utils import override_settings
-from django.utils import unittest
 from django.conf.urls import patterns
 from freezegun import freeze_time
 from rest_framework import status