fix test of account register & add test about captcha

Because of adding `captcha_required` at register(AccountView.patch), tests have failed.
I now get it fixed

Author: szdytom

account/tests.py

@@ -5,6 +5,7 @@
 
 from .views import AccountView, AccountUsernameAccessibilityView
 from .models import User
+from captcha.models import CaptchaStore
 
 # Create your tests here.
 class AccountTest(TestCase):
@@ -22,8 +23,13 @@ def testA_add_user(self):
             "username": "unittesuser01",
             "email": "unittesuser01@soj.ac.cn",
             "password": "unittest",
+            "captcha_key": 1234,
+            "captcha_answer": "unit"
         }
 
+        c = CaptchaStore(key=request_data["captcha_key"], answer=request_data["captcha_answer"])
+        c.save()
+
         request = self.factory.post(self.base_url, data=request_data, format="json")
         res = self.view(request)
         self.assertEqual(res.status_code, status.HTTP_201_CREATED)
@@ -67,11 +73,19 @@ def testE_add_exit_user(self):
             "username": "unittesuser02",
             "email": "unittesuser02@soj.ac.cn",
             "password": "unittest",
+            "captcha_key": 4456,
+            "captcha_answer": "ut2x"
         }
 
+        c = CaptchaStore(key=request_data["captcha_key"], answer=request_data["captcha_answer"])
+        c.save()
+
         request = self.factory.post(self.base_url, data=request_data, format="json")
         self.view(request)
 
+        c = CaptchaStore(key=request_data["captcha_key"], answer=request_data["captcha_answer"])
+        c.save()
+
         request = self.factory.post(self.base_url, data=request_data, format="json")
         res = self.view(request)
         self.assertEqual(res.status_code, status.HTTP_409_CONFLICT)