/**
  * Test method for {@link
  * io.vertx.ext.mail.impl.sasl.AuthOperationFactory#createAuth(java.lang.String, java.lang.String,
  * java.util.Set)} make sure that the default auth method works and is PLAIN
  *
  * @throws Exception
  */
 @Test
 public final void testCreateAuth() throws Exception {
   Set<String> allowedAuth = new HashSet<String>();
   allowedAuth.add("PLAIN");
   assertEquals(
       AuthPlain.class, AuthOperationFactory.createAuth("user", "pw", allowedAuth).getClass());
 }
 @Test
 public final void testAuthNotFound() throws Exception {
   Set<String> allowedAuth = new HashSet<String>();
   allowedAuth.add("ASDF");
   assertNull(AuthOperationFactory.createAuth("user", "pw", allowedAuth));
 }