Approved for test framework update

I like this Kata!

there should be tests with multiple concurrent Events to prevent passing the state with global variables

the it block should have no other public properties will contain no assertions when Event has no enumerable properties at all, causing the assertion to be displayed in Red even though it passes

Read this for more info

OP solved it, closing

You have an error in unsubscribe method, it does not remove the corresponding functions correctly because you are missing one argument to a particular function which by default will be 0.

OP solved it, closing

OP left the building

OP solved it, closing

Ranks on old katas can't be changed

Ranks on old katas can't be changed

No tests, description not sufficient for solutions

any hints?

should be upgraded to modern JS/Node, with a class in the initial code