DEV: Assert for 200 response code to avoid changing magic helper in the future.

spec/support/integration_helpers.rb

@@ -2,7 +2,7 @@ module IntegrationHelpers
   def create_user
     get "/u/hp.json"
 
-    expect(response).to be_successful
+    expect(response.status).to eq(200)
 
     body = JSON.parse(response.body)
     honeypot = body["value"]
@@ -17,7 +17,7 @@ module IntegrationHelpers
       challenge: challenge.reverse
     }
 
-    expect(response).to be_successful
+    expect(response.status).to eq(200)
 
     body = JSON.parse(response.body)
     User.find(body["user_id"])