@Test
	public void testNotRegisteredDNSLookup() throws UnknownHostException {
		System.setProperty("ngrinder.etc.hosts", "www.google.com:10.10.10.10,www.google.com:10.10.10.11");
		NameStore.getInstance().reset();
		assertThat(localDNS.lookupAllHostAddr("www.naver.com").length, greaterThan(0));
	}
To test the custom DNS, should to add vm arguments as below:
-Dsun.net.spi.nameservice.provider.1=dns,LocalManagedDnsProxy
-Dngrinder.etc.hosts=10.0.0.1:www.google.com,10.0.0.2:www.google2.com.

@author JunHo Yoon
ngrinder-runtime/src/test/java/org/ngrinder/dns/LocalManagedDnsTest.java