private void addIllegalEdge(Point from, Point to, Class<? extends IntervalException> err) {
try {
Intervals.addHb(from, to);
Assert.fail("No error");
} catch (IntervalException e) {
Assert.assertEquals("Wrong class", err, e.getClass());
}
}
private void addLegalEdge(Point from, Point to) {
Intervals.addHb(from, to);
}