@Test
    public void testIsValidIpv4RangeFoobar() throws Exception
    {
        // Setup test fixture.
        final String input = "foobar";

        // Execute system under test.
        final boolean result = IpUtils.isValidIpv4Range(input);

        // Verify results.
        assertFalse(result);
    }
Asserts that {@link IpUtils#isValidIpv4Range(String)} does not identify a 'foobar' text value as a valid IPv4 address range.
xmppserver/src/test/java/org/jivesoftware/util/IpUtilsTest.java