@Test
 public void defaultTransportForSipIsUdp() {
   assertEquals("UDP", LocatorUtils.getDefaultTransportForScheme("sip"));
 }
 @Test
 public void defaultTransportForSipsIsTls() {
   assertEquals("TLS", LocatorUtils.getDefaultTransportForScheme("sips"));
 }
 @Test(expected = IllegalArgumentException.class)
 public void defaultTransportForInvalidSchemeThrowsException() {
   LocatorUtils.getDefaultTransportForScheme("foo");
 }