setup: func(t *testing.T) {
                op.EXPECT().
                    IntrospectToken(gomock.Any(), gomock.Eq("access-token"), gomock.Eq(fosite.AccessToken), gomock.Any()).
                    DoAndReturn(func(_ context.Context, _ string, _ fosite.TokenType, _ fosite.Session, _ ...string) (fosite.TokenType, fosite.AccessRequester, error) {
                        session := &oauth2.Session{