@Test
public void testGenerateMacOnIncrease() {

    String mac = "06:01:23:00:45:67";
    assertEquals("06:01:25:00:45:67", NetUtils.generateMacOnIncrease(mac, 2));
    assertEquals("06:01:33:00:45:67", NetUtils.generateMacOnIncrease(mac, 16));
    mac = "06:ff:ff:00:45:67";
    assertEquals("06:00:00:00:45:67", NetUtils.generateMacOnIncrease(mac, 1));
    assertEquals("06:00:0f:00:45:67", NetUtils.generateMacOnIncrease(mac, 16));
}