key:      "statsd",
			option:   option.StatsdAddress(""),
			expected: nil,
		},
		{
			testName: "statsd address ipv4",
			key:      "statsd",
			option:   option.StatsdAddress("127.0.0.1:80"),
			expected: "{\"address\": \"127.0.0.1\", \"port_value\": 80}",
		},
		{
			testName: "statsd address ipv6",
			key:      "statsd",
			option:   option.StatsdAddress("[2001:db8::100]:80"),

	opts = append(opts, option.ProxyConfig(config),
		option.Cluster(getServiceCluster(metadata)),
		option.PilotGRPCAddress(config.DiscoveryAddress),
		option.DiscoveryAddress(config.DiscoveryAddress),
		option.StatsdAddress(config.StatsdUdpAddress),
		option.XDSRootCert(metadata.XDSRootCert))

	// Add tracing options.
	if config.Tracing != nil {
		isH2 := false
		switch tracer := config.Tracing.Tracer.(type) {