public boolean isInfrastructure(ConnectPoint connectPoint) {
        return infrastructurePoints.get().contains(connectPoint);
    }
@Test
    public void pointRelated() {
        assertTrue("should be infrastructure point",
                   dt.isInfrastructure(new ConnectPoint(D1, P1)));
        assertFalse("should not be infrastructure point",
                    dt.isInfrastructure(new ConnectPoint(D1, P2)));
    }