Add and include DeserializeHelpers

spec/deserialize_helpers.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+module DeserializeHelpers
+  def deserialize_response(response)
+    ActiveModelSerializers::Deserialization.jsonapi_parse(JSON.parse(response.body))
+  end
+end

spec/rails_helper.rb

@@ -2,6 +2,7 @@
 
 require 'spec_helper'
 require 'auth_helpers'
+require 'deserialize_helpers'
 
 ENV['RAILS_ENV'] ||= 'test'
 require File.expand_path('../config/environment', __dir__)
@@ -64,6 +65,7 @@ RSpec.configure do |config|
   config.include FactoryBot::Syntax::Methods
   config.include Devise::Test::ControllerHelpers, type: :controller
   config.include AuthHelpers
+  config.include DeserializeHelpers
 end
 
 Shoulda::Matchers.configure do |config|