diff --git a/contest/tests.py b/contest/tests.py
index e69de29..11d29b2 100644
--- a/contest/tests.py
+++ b/contest/tests.py
@@ -0,0 +1,107 @@
+from datetime import datetime, timedelta
+
+import copy
+from django.utils import timezone
+
+from utils.api._serializers import DateTimeTZField
+from utils.api.tests import APITestCase
+from .models import ContestAnnouncement
+from .models import ContestRuleType
+
+DEFAULT_CONTEST_DATA = {"title": "test title", "description": "test description",
+                        "start_time": timezone.localtime(timezone.now()),
+                        "end_time": timezone.localtime(timezone.now()) + timedelta(days=1),
+                        "rule_type": ContestRuleType.ACM,
+                        "password": "123",
+                        "visible": True, "real_time_rank": True}
+
+
+class ContestAPITest(APITestCase):
+    def setUp(self):
+        self.create_super_admin()
+        self.url = self.reverse("contest_api")
+        self.data = DEFAULT_CONTEST_DATA
+
+    def test_create_contest(self):
+        response = self.client.post(self.url, data=self.data)
+        self.assertSuccess(response)
+        return response
+
+    def test_update_contest(self):
+        id = self.test_create_contest().data["data"]["id"]
+        update_data = {"id": id, "title": "update title",
+                       "description": "update description",
+                       "password": "12345",
+                       "visible": False, "real_time_rank": False}
+        data = copy.deepcopy(self.data)
+        data.update(update_data)
+        response = self.client.put(self.url, data=data)
+        self.assertSuccess(response)
+        response_data = response.data["data"]
+        datetime_tz_field = DateTimeTZField()
+        for k in data.keys():
+            if isinstance(data[k], datetime):
+                data[k] = datetime_tz_field.to_representation(data[k])
+            self.assertEqual(response_data[k], data[k])
+
+    def test_get_contests(self):
+        self.test_create_contest()
+        response = self.client.get(self.url)
+        self.assertSuccess(response)
+
+    def test_get_one_contest(self):
+        id = self.test_create_contest().data["data"]["id"]
+        response = self.client.get("{}?id={}".format(self.url, id))
+        self.assertSuccess(response)
+
+
+class ContestAnnouncementAPITest(APITestCase):
+    def setUp(self):
+        self.create_super_admin()
+        self.url = self.reverse("contest_announcement_admin_api")
+        contest_id = self.create_contest().data["data"]["id"]
+        self.data = {"title": "test title", "content": "test content", "contest_id": contest_id}
+
+    def create_contest(self):
+        url = self.reverse("contest_api")
+        data = DEFAULT_CONTEST_DATA
+        return self.client.post(url, data=data)
+
+    def test_create_contest_announcement(self):
+        response = self.client.post(self.url, data=self.data)
+        self.assertSuccess(response)
+        return response
+
+    def test_delete_contest_announcement(self):
+        id = self.test_create_contest_announcement().data["data"]["id"]
+        response = self.client.delete("{}?id={}".format(self.url, id))
+        self.assertSuccess(response)
+        self.assertFalse(ContestAnnouncement.objects.filter(id=id).exists())
+
+    def test_get_contest_announcements(self):
+        self.test_create_contest_announcement()
+        response = self.client.get(self.url)
+        self.assertSuccess(response)
+
+    def test_get_one_contest_announcement(self):
+        id = self.test_create_contest_announcement().data["data"]["id"]
+        response = self.client.get("{}?id={}".format(self.url, id))
+        self.assertSuccess(response)
+
+
+class ContestAnnouncementListAPITest(APITestCase):
+    def setUp(self):
+        self.create_super_admin()
+        self.url = self.reverse("contest_list_api")
+
+    def create_contest_announcements(self):
+        contest_id = self.client.post(self.reverse("contest_api"), data=DEFAULT_CONTEST_DATA).data["data"]["id"]
+        url = self.reverse("contest_announcement_admin_api")
+        self.client.post(url, data={"title": "test title1", "content": "test content1", "contest_id": contest_id})
+        self.client.post(url, data={"title": "test title2", "content": "test content2", "contest_id": contest_id})
+        return contest_id
+
+    def test_get_contest_announcement_list(self):
+        contest_id = self.create_contest_announcements()
+        response = self.client.get(self.url, data={"contest_id": contest_id})
+        self.assertSuccess(response)
diff --git a/contest/views/admin.py b/contest/views/admin.py
index 15007ad..4f479cc 100644
--- a/contest/views/admin.py
+++ b/contest/views/admin.py
@@ -1,7 +1,6 @@
 import dateutil.parser
 
 from utils.api import APIView, validate_serializer
-
 from ..models import Contest, ContestAnnouncement
 from ..serializers import (ContestAnnouncementSerializer, ContestSerializer,
                            CreateConetestSeriaizer,
@@ -20,8 +19,8 @@ class ContestAPI(APIView):
             return self.error("Start time must occur earlier than end time")
         if not data["password"]:
             data["password"] = None
-        Contest.objects.create(**data)
-        return self.success()
+        contest = Contest.objects.create(**data)
+        return self.success(ContestSerializer(contest).data)
 
     @validate_serializer(EditConetestSeriaizer)
     def put(self, request):
@@ -90,7 +89,8 @@ class ContestAnnouncementAPI(APIView):
         contest_announcement_id = request.GET.get("id")
         if contest_announcement_id:
             if request.user.is_admin():
-                ContestAnnouncement.objects.filter(id=contest_announcement_id, contest__created_by=request.user).delete()
+                ContestAnnouncement.objects.filter(id=contest_announcement_id,
+                                                   contest__created_by=request.user).delete()
             else:
                 ContestAnnouncement.objects.filter(id=contest_announcement_id).delete()
         return self.success()