@Test
    public void testIsAddressInAnyOfIpv4NonSplitEmptySets()
    {
        // Setup test fixture.
        final Ipv4 needle = Ipv4.of("198.51.100.5");
        final Set<String> addressesAndRanges = new HashSet<>();

        // Execute system under test.
        final boolean result = IpUtils.isAddressInAnyOf(needle, addressesAndRanges);

        // Verify results.
        assertFalse(result);
    }
Asserts that {@link IpUtils#isAddressInAnyOf(Ipv4, Set)} does not find the provided address in empty
sets of addresses and ranges.
xmppserver/src/test/java/org/jivesoftware/util/IpUtilsTest.java