old_contents: from .initial_data import request_user, chatid
  
  request = {
      "endpoint": "/api/chats/{}/participants".format(chatid),
      "method": "post",
      "user": request_user,
      "body": {
          "users": [666666]
      }
  }
  
new_contents: from .initial_data import request_user, chatid
  
  request = {
      "endpoint": "/api/chats/{}/participants".format(chatid),
      "method": "post",
      "user": request_user,
      "body": {
          "users": [666666, 22]
      }
  }
  
subject: Fix testcase for better coverage