diff --git a/DRF_simplejwt/settings.py b/DRF_simplejwt/settings.py
index 1cac7fe..89e4b92 100644
--- a/DRF_simplejwt/settings.py
+++ b/DRF_simplejwt/settings.py
@@ -175,6 +175,12 @@
     'DEFAULT_AUTHENTICATION_CLASSES': (
         'rest_framework_simplejwt.authentication.JWTAuthentication',
     ),
+    'DEFAULT_PARSER_CLASSES': [
+        'rest_framework.parsers.JSONParser',
+        'rest_framework.parsers.FormParser',
+        'rest_framework.parsers.MultiPartParser'
+    ],
+    'TEST_REQUEST_DEFAULT_FORMAT': 'json',
 }
 
 PASSWORD_HASHERS = [
diff --git a/users/serializers.py b/users/serializers.py
index 08eddd4..77bbdb5 100644
--- a/users/serializers.py
+++ b/users/serializers.py
@@ -5,7 +5,6 @@
 from rest_framework                       import serializers
 from rest_framework.serializers           import ModelSerializer
 from rest_framework_simplejwt.serializers import TokenObtainPairSerializer
-from rest_framework_simplejwt.tokens      import OutstandingToken, BlacklistedToken
 
 from users.models import User
 
@@ -49,9 +48,6 @@ def validate(self, data):
         
         if not check_password(password, user.password):
             raise serializers.ValidationError('detail : invalid password')
-
-        for token in OutstandingToken.objects.filter(user=user):
-            BlacklistedToken.objects.get_or_create(token=token)
         
         token         = super().get_token(user)
         refresh_token = str(token)
diff --git a/users/tests.py b/users/tests.py
index 7ce503c..f80bc8a 100644
--- a/users/tests.py
+++ b/users/tests.py
@@ -1,3 +1,56 @@
-from django.test import TestCase
+import json
 
-# Create your tests here.
+from rest_framework.test             import APITestCase
+from rest_framework_simplejwt.tokens import OutstandingToken
+
+from users.models import User
+
+class UserSignUpTest(APITestCase):
+    
+    maxDiff = None
+    
+    def test_success_user_signup(self):
+        data = {
+            'email'    : 'DGK-test-01@gmail.com',
+            'nickname' : 'DGK-01',
+            'password' : 'DGK12345678'
+        }
+        
+        response = self.client.post('/users/signup', data=json.dumps(data), content_type='application/json')
+        
+        self.assertEqual(response.status_code, 201)
+        self.assertEqual(
+            response.data,
+            {
+                'email'    : 'DGK-test-01@gmail.com',
+                'nickname' : 'DGK-01'
+            }
+        )
+    
+
+class UserSignInTest(APITestCase):
+    
+    maxDiff = None
+    
+    @classmethod
+    def setUpTestData(cls):
+        User.objects.create_user(
+            email    = 'DGK-test@gmail.com',
+            nickname = 'DGK01',
+            password = 'DGK12345678'
+        )
+
+    def test_success_user_signin(self):
+        data = {
+            'email'    : 'DGK-test@gmail.com',
+            'nickname' : 'DGK01',
+            'password' : 'DGK12345678'
+        }
+        
+        response = self.client.post('/users/signin', data=json.dumps(data), content_type='application/json')
+        
+        user  = User.objects.get(email='DGK-test@gmail.com')
+        token = OutstandingToken.objects.get(user=user).token
+        
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(token, response.json()['refresh'])
\ No newline at end of file
diff --git a/users/urls.py b/users/urls.py
index 4bcd07e..db08f5d 100644
--- a/users/urls.py
+++ b/users/urls.py
@@ -7,6 +7,6 @@
     path('/signup', UserSignUpView.as_view()),
     path('/signin', UserSignInView.as_view()),
     path('/signout', UserSignOutView.as_view()),
-    path('/auth', UserinfoView.as_view()),
+    path('/auth-info', UserinfoView.as_view()),
     path('/token/refresh', TokenRefreshView.as_view()),
 ]
diff --git a/users/views.py b/users/views.py
index 037cf7d..fea3041 100644
--- a/users/views.py
+++ b/users/views.py
@@ -6,7 +6,6 @@
 from drf_yasg          import openapi
 from drf_yasg.utils    import swagger_auto_schema
 
-from users.models      import User
 from users.serializers import SignUpSerializer, SignInSerializer
     
 class UserSignUpView(APIView):