@Test
public void testInitialize() throws Exception {

    ArrayList<InetAddress> dnsServers = new ArrayList<>();
    dnsPacketProxy = new DnsPacketProxy(mockEventLoop, Mockito.mock(RuleDatabase.class));
    dnsPacketProxy.initialize(Mockito.mock(Context.class), dnsServers);
    assertSame(dnsServers, dnsPacketProxy.upstreamDnsServers);
}