@Test public void testRemoveHost(){
  assertEquals(16,mapper.hosts.length);
  mapper.removeHostAlias("iowejoiejfoiew");
  mapper.removeHost("iowejoiejfoiew_alias");
  assertEquals(16,mapper.hosts.length);
  mapper.removeHostAlias("iowejoiejfoiew_alias");
  assertEquals(15,mapper.hosts.length);
  mapper.addHostAlias("iowejoiejfoiew","iowejoiejfoiew_alias");
  assertEquals(16,mapper.hosts.length);
  final int iowPos=3;
  Mapper.Host hostMapping=mapper.hosts[iowPos];
  Mapper.Host aliasMapping=mapper.hosts[iowPos + 1];
  assertEquals("iowejoiejfoiew_alias",aliasMapping.name);
  assertTrue(aliasMapping.isAlias());
  assertSame(hostMapping.object,aliasMapping.object);
  assertEquals("iowejoiejfoiew",hostMapping.getRealHostName());
  assertEquals("iowejoiejfoiew",aliasMapping.getRealHostName());
  assertSame(hostMapping,hostMapping.getRealHost());
  assertSame(hostMapping,aliasMapping.getRealHost());
  mapper.removeHost("iowejoiejfoiew");
  assertEquals(14,mapper.hosts.length);
  for (  Mapper.Host host : mapper.hosts) {
    assertTrue(host.name,!host.name.startsWith("iowejoiejfoiew"));
  }
}