Go to particular activity

Tutorials/Documentation
1 
 @caps['name'] = 'Ruby Appium Example'
    @caps['deviceName'] = @device_name
    @caps['platformName'] = 'Android'
    @caps['noReset'] = true
    @caps['fullReset'] = false
   
    @caps['appPackage'] = 'com.xyz.abc'
    @caps['app'] = './apk/xyz.apk'
    @caps['appActivity'] = 'com.xyz.abc.activity.SplashScreenActivity'
    @caps

How can i go to testActivity ?

I am using ruby.