//
// See https://www.iana.org/assignments/protocol-numbers
//
// On Unix, this map is augmented by readProtocols via lookupProtocol.
var protocols = map[string]int{
	"icmp":      1,
	"igmp":      2,
	"tcp":       6,
	"udp":       17,
	"ipv6-icmp": 58,
}

// services contains minimal mappings between services names and port
// numbers for platforms that don't have a complete list of port numbers.
//

func TestLookupProtocol_Minimal(t *testing.T) {
	type test struct {
		name string
		want int
	}
	var tests = []test{
		{"tcp", 6},
		{"TcP", 6}, // case shouldn't matter
		{"icmp", 1},
		{"igmp", 2},
		{"udp", 17},
		{"ipv6-icmp", 58},
	}

	for _, tt := range tests {
		got, err := lookupProtocol(context.Background(), tt.name)
		if got != tt.want || err != nil {

// It depends on each operating system how the operating system
// behaves with a non-well known protocol number such as "0" or "255".
//
// Examples:
//
//	Dial("ip4:1", "192.0.2.1")
//	Dial("ip6:ipv6-icmp", "2001:db8::1")
//	Dial("ip6:58", "fe80::1%lo0")
//
// For TCP, UDP and IP networks, if the host is empty or a literal
// unspecified IP address, as in ":80", "0.0.0.0:80" or "[::]:80" for