How to use the ward.models.Scope.Global function in ward

def scope_key_from(self, scope: Scope) -> ScopeKey:
        if scope == Scope.Test:
            return self.id
        elif scope == Scope.Module:
            return self.path
        else:
            return Scope.Global

    @fixture(scope=Scope.Global)
    def a():
        events.append("resolve a")
        yield "a"
        events.append("teardown a")

def teardown_global_fixtures(self):
        self.teardown_fixtures_for_scope(Scope.Global, Scope.Global)