How to use telegram test server correctly?

Question

Messengers

When you create an application for a telegram, two addresses are issued, "test" and "working". When working on the "working" - everything works, but with the "test" - it's impossible to log in, request a code, etc.. Are there any nuances? And then at work I am periodically banned for flooding https://core.telegram.org/api/errors#420-flood (the number of requests with the same arguments), this is very inconvenient.