Appium UIA iOS 9.x workaround for backgrouding app

background.rb

#!/usr/bin/env ruby

require "appium_lib"

APP_PATH="./node_modules/appium-uiauto/test/assets/UICatalog.app"

def desired_caps
    {
        caps: {
        platformName: 'iOS',
        deviceName:  'iPhone 6',
        versionNumber:  '9.2',
        # appName: 'UICatalog',
        app: APP_PATH
    },
        appium_lib: {
        sauce_username: nil, # don't run on sauce
        sauce_access_key: nil,
        wait: 10,
    }
    }
end

driver = Appium::Driver.new desired_caps
begin 
    driver.start_driver
    driver.set_context "NATIVE_APP"
    sleep 5
    driver.background_app 4
    sleep 3
rescue Exception
    p $!
    puts $@
ensure
    driver.x
end