Fix all the errors to get our tests green on Rails 5.1.

spec/support/integration_helpers.rb

@@ -1,9 +1,33 @@
 module IntegrationHelpers
+  def create_user
+    get "/u/hp.json"
+
+    expect(response).to be_success
+
+    body = JSON.parse(response.body)
+    honeypot = body["value"]
+    challenge = body["challenge"]
+    user = Fabricate.build(:user)
+
+    post "/u.json", params: {
+      username: user.username,
+      email: user.email,
+      password: 'asdasljdhaiosdjioaeiow',
+      password_confirmation: honeypot,
+      challenge: challenge.reverse
+    }
+
+    expect(response).to be_success
+
+    body = JSON.parse(response.body)
+    User.find(body["user_id"])
+  end
+
   def sign_in(user)
     password = 'somecomplicatedpassword'
     user.update!(password: password)
     Fabricate(:email_token, confirmed: true, user: user)
-    xhr :post, "/session.json", login: user.username, password: password
+    post "/session.json", params: { login: user.username, password: password }
     expect(response).to be_success
   end
 end