diff --git a/test/integration/discord/users_controller_test.rb b/test/integration/discord/users_controller_test.rb
index 06398ededf2..c4cb9ac482a 100644
--- a/test/integration/discord/users_controller_test.rb
+++ b/test/integration/discord/users_controller_test.rb
@@ -1,34 +1,39 @@
 # frozen_string_literal: true
 
 require 'test_helper'
+require 'supports/mock_env_helper'
 
 module Discord
   class UsersControllerTest < ActionDispatch::IntegrationTest
+    include MockEnvHelper
+
     test 'POST create by student' do
-      Card.stub(:new, -> { FakeCard.new }) do
-        Subscription.stub(:new, -> { FakeSubscription.new }) do
-          Discord::TimesChannel.stub(:new, ->(_) { ValidTimesChannel.new }) do
-            assert_difference 'User.students.count', 1 do
-              post users_path,
-                   params: {
-                     user: {
-                       adviser: 'false',
-                       trainee: 'false',
-                       company_id: '',
-                       login_name: 'Piyopiyo-student',
-                       email: 'piyopiyo-student@example.com',
-                       name: '現役生です',
-                       name_kana: 'ゲンエキセイデス',
-                       description: '現役生と言います。よろしくお願いします。',
-                       job: 'part_time_worker',
-                       os: 'linux',
-                       experience: 'inexperienced',
-                       password: 'passW0rd1234',
-                       password_confirmation: 'passW0rd1234',
-                       coc: 1,
-                       tos: 2
+      mock_env('DISCORD_GUILD_ID' => '111') do
+        Card.stub(:new, -> { FakeCard.new }) do
+          Subscription.stub(:new, -> { FakeSubscription.new }) do
+            Discord::TimesChannel.stub(:new, ->(_) { ValidTimesChannel.new }) do
+              assert_difference 'User.students.count', 1 do
+                post users_path,
+                     params: {
+                       user: {
+                         adviser: 'false',
+                         trainee: 'false',
+                         company_id: '',
+                         login_name: 'Piyopiyo-student',
+                         email: 'piyopiyo-student@example.com',
+                         name: '現役生です',
+                         name_kana: 'ゲンエキセイデス',
+                         description: '現役生と言います。よろしくお願いします。',
+                         job: 'part_time_worker',
+                         os: 'linux',
+                         experience: 'inexperienced',
+                         password: 'passW0rd1234',
+                         password_confirmation: 'passW0rd1234',
+                         coc: 1,
+                         tos: 2
+                       }
                      }
-                   }
+              end
             end
           end
         end
@@ -36,43 +41,39 @@ class UsersControllerTest < ActionDispatch::IntegrationTest
       assert_redirected_to root_url
 
       student = User.find_by(login_name: 'Piyopiyo-student')
-      student.create_discord_profile unless student.discord_profile
-      student.discord_profile.times_id = ValidTimesChannel.new.id
-      student.discord_profile.save!
       assert_not_nil student.discord_profile.times_id
     end
 
     test 'POST create by trainee' do
-      Discord::TimesChannel.stub(:new, ->(_) { ValidTimesChannel.new }) do
-        assert_difference 'User.trainees.count', 1 do
-          post users_path,
-               params: {
-                 user: {
-                   adviser: 'false',
-                   trainee: 'true',
-                   company_id: '123456789',
-                   login_name: 'Piyopiyo-trainee',
-                   email: 'piyopiyo-trainee@example.com',
-                   name: '研修生です',
-                   name_kana: 'ケンシュウセイデス',
-                   description: '研修生と言います。よろしくお願いします。',
-                   job: 'office_worker',
-                   os: 'windows_wsl2',
-                   experience: 'ruby',
-                   password: 'passW0rd1234',
-                   password_confirmation: 'passW0rd1234',
-                   coc: 1,
-                   tos: 2
+      mock_env('DISCORD_GUILD_ID' => '222') do
+        Discord::TimesChannel.stub(:new, ->(_) { ValidTimesChannel.new }) do
+          assert_difference 'User.trainees.count', 1 do
+            post users_path,
+                 params: {
+                   user: {
+                     adviser: 'false',
+                     trainee: 'true',
+                     company_id: '123456789',
+                     login_name: 'Piyopiyo-trainee',
+                     email: 'piyopiyo-trainee@example.com',
+                     name: '研修生です',
+                     name_kana: 'ケンシュウセイデス',
+                     description: '研修生と言います。よろしくお願いします。',
+                     job: 'office_worker',
+                     os: 'windows_wsl2',
+                     experience: 'ruby',
+                     password: 'passW0rd1234',
+                     password_confirmation: 'passW0rd1234',
+                     coc: 1,
+                     tos: 2
+                   }
                  }
-               }
+          end
         end
       end
       assert_redirected_to root_url
 
       trainee = User.find_by(login_name: 'Piyopiyo-trainee')
-      trainee.create_discord_profile unless trainee.discord_profile
-      trainee.discord_profile.times_id = ValidTimesChannel.new.id
-      trainee.discord_profile.save!
       assert_not_nil trainee.discord_profile.times_id
     end
 
@@ -130,7 +131,7 @@ def save
       end
 
       def id
-        'fake_times_snowflake_0123456789'
+        '1234567890123456789'
       end
     end
   end