What way of settings Ad testmode is overrides other?

Hi. I know 3 ways of setting test mode for ads in unity application. 1. Unity web-site dashboard. It is global, and overrides all builds. 2. Unity editor dashboard. It affects the app version that will be build with current testmode settings. 3. Code initialization through method Initialize with second parameter. It akso affects the app version that will be build with current testmode settings. So, I really do understand that 1 method overrides all tries to make ad test or not test. But what about second and third methods? How they related, and which is overrides other? Thank you.