for(int i = 0, cnt = rand.nextInt(100); i < cnt; i++) {
source = range.getStart() - rand.nextInt(range.getStart()) - 1;
target = range.getStart() - rand.nextInt(range.getStart()) - 1;
conn = new SimpleConnection(source, target, true);
assertEquals(false, connFilter.accept(conn));
source = range.getStart() - rand.nextInt(range.getStart()) - 1;
target = range.getEnd() + rand.nextInt(range.getEnd());
conn = new SimpleConnection(source, target, true);
assertEquals(false, connFilter.accept(conn));