Anybody who wants to test that his wallet can receive grin or to have some balance for messing around, you are free to use following command:
Dotnet core service at the other end will scan your 13415 port and if opened, attempt to send grin. There is plenty for everybody at the moment of writing. Service will block your IP each time for 10 minutes or even permanently if you try too many times.
Please note that each transaction locks wallet until cleared.