public static void event_with_string_payload()
{
test.ITesting obj = new test.Testing();
string received_string = null;
obj.EvtWithStringEvt += (object sender, EvtWithStringEvt_Args e) => {
received_string = e.arg;
};
obj.EmitEventWithString("Some args");
Test.AssertEquals("Some args", received_string);
}