@Test
public void empty() {

    // ensure empty can grab a default CRS when starting from nothing
    ReferencedEnvelope3D bbox = new ReferencedEnvelope3D(); // this is empty
    assertNull(bbox.getCoordinateReferenceSystem());
    ReferencedEnvelope3D australia = new ReferencedEnvelope3D(DefaultGeographicCRS.WGS84_3D);
    australia.include(40, 110, 0);
    australia.include(10, 150, 10);
    bbox.include(australia);
    
    assertEquals( australia.getCoordinateReferenceSystem(), bbox.getCoordinateReferenceSystem() );
}