@Test
public void shouldNotFindBiggestAndSmallestPrefixWhenDoesNotExist() {
Ipv6Range range =
Ipv6Range.from("::").to(BigInteger.valueOf(2).pow(128).subtract(BigInteger.valueOf(2)));
assertFalse(findMinimumPrefixForPrefixLength(range, 0).isPresent());
assertFalse(findMaximumPrefixForPrefixLength(range, 0).isPresent());
}
@Test
public void shouldFindBiggestAndSmallestPrefixWhenRangeIsNotValidPrefix() {
Ipv6Range range = Ipv6Range.from("::1").to("::4");
assertEquals(Ipv6Range.parse("::2/127"), findMaximumPrefixForPrefixLength(range, 127).get());
assertEquals(Ipv6Range.parse("::2/127"), findMinimumPrefixForPrefixLength(range, 127).get());
assertEquals(Ipv6Range.parse("::2/127"), findMaximumPrefixForPrefixLength(range, 128).get());
assertEquals(Ipv6Range.parse("::1/128"), findMinimumPrefixForPrefixLength(range, 128).get());
Ipv6Range otherRange =
Ipv6Range.from("::").to(BigInteger.valueOf(2).pow(128).subtract(BigInteger.valueOf(2)));
assertEquals(Ipv6Range.parse("::/1"), findMaximumPrefixForPrefixLength(otherRange, 1).get());
assertEquals(Ipv6Range.parse("::/1"), findMinimumPrefixForPrefixLength(otherRange, 1).get());
assertEquals(Ipv6Range.parse("::/1"), findMaximumPrefixForPrefixLength(otherRange, 2).get());
assertEquals(
Ipv6Range.parse("8000::/2"), findMinimumPrefixForPrefixLength(otherRange, 2).get());
assertEquals(Ipv6Range.parse("::/1"), findMaximumPrefixForPrefixLength(otherRange, 128).get());
assertEquals(
Ipv6Range.parse("ffff:ffff:ffff:ffff:ffff:ffff:ffff:fffe/128"),
findMinimumPrefixForPrefixLength(otherRange, 128).get());
}