{snet: "tcp6", saddr: "[::]:0", tnet: "tcp6", taddr: "::1"},

	{snet: "tcp6", saddr: "[::1]:0", tnet: "tcp6", taddr: "::1"},
}

// TestTCPServer tests concurrent accept-read-write servers.
func TestTCPServer(t *testing.T) {
	const N = 3

	for i, tt := range tcpServerTests {
		t.Run(tt.snet+" "+tt.saddr+"<-"+tt.taddr, func(t *testing.T) {
			if !testableListenArgs(tt.snet, tt.saddr, tt.taddr) {