// SPDX-FileCopyrightText: 2026 Echolot contributors
// SPDX-License-Identifier: GPL-3.0-or-later

package control

import "testing"

func TestDscpArg(t *testing.T) {
	ptr := func(v int) *int { return &v }
	for _, tc := range []struct {
		in      *int
		want    int
		wantErr bool
	}{
		{nil, -1, false},     // absent: leave the socket alone
		{ptr(0), 0, false},   // explicit best-effort is not the same as absent
		{ptr(46), 46, false}, // EF, the value people actually test with
		{ptr(63), 63, false},
		{ptr(64), 0, true}, // one past the 6-bit field
		{ptr(-1), 0, true},
	} {
		got, err := dscpArg(tc.in)
		if (err != nil) != tc.wantErr || got != tc.want {
			t.Errorf("dscpArg(%v) = %d, err=%v; want %d, wantErr=%v", tc.in, got, err, tc.want, tc.wantErr)
		}
	}
}