Bikes died ?☹

[Gnasher]

Question now is how to i test the other parts of the charging system?

Mate you just need to

Check the voltage across the battery when the bike is running at 6500k, you should have 14v if so the charging system is fine.

These systems are very reliable in my experience, in the vast majority of cases battery issues are down to cheap batteries.  If the voltage rises as the revs increase the charging system is working, if components fail they either don't charge at all or over charge, the latter usually blows the rectifier which means no voltage.  Yes there're specific tests for each component but unless you've got a good knowledge of the what they're and the kit your'll wasting your time.