feat: add nftables forwarding mode

go-backend/internal/runtime/nftables/parser_test.go

@@ -0,0 +1,46 @@
+package nftables
+
+import "testing"
+
+func TestParseSingleTargetAcceptsHostPortAndIPv6(t *testing.T) {
+	tests := []struct {
+		name string
+		raw  string
+		host string
+		port int
+	}{
+		{name: "hostname", raw: "example.com:443", host: "example.com", port: 443},
+		{name: "ipv4", raw: "198.51.100.20:8443", host: "198.51.100.20", port: 8443},
+		{name: "ipv6", raw: "[2001:db8::1]:443", host: "2001:db8::1", port: 443},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			target, err := ParseSingleTarget(tt.raw)
+			if err != nil {
+				t.Fatalf("ParseSingleTarget: %v", err)
+			}
+			if target.Host != tt.host || target.Port != tt.port {
+				t.Fatalf("expected %s/%d, got %+v", tt.host, tt.port, target)
+			}
+		})
+	}
+}
+
+func TestParseSingleTargetRejectsUnsupportedValues(t *testing.T) {
+	for _, raw := range []string{
+		"",
+		"example.com",
+		"example.com:0",
+		"example.com:65536",
+		"a:1,b:2",
+		"http://example.com:443",
+		"https:443",
+		"mailto:443",
+	} {
+		t.Run(raw, func(t *testing.T) {
+			if _, err := ParseSingleTarget(raw); err == nil {
+				t.Fatalf("expected error for %q", raw)
+			}
+		})
+	}
+}