test(internal/linkstatus): add unit testing for link status

Author: huhong-web

internal/linkstatus/link_status_test.go

@@ -0,0 +1,154 @@
+// Copyright 2026 The HuaTuo Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package linkstatus
+
+import (
+	"reflect"
+	"testing"
+
+	"golang.org/x/sys/unix"
+)
+
+func TestTypes_String(t *testing.T) {
+	tests := []struct {
+		name string
+		in   Types
+		want string
+	}{
+		{"Unknown", Unknown, "linkstatus_unknown"},
+		{"AdminUp", AdminUp, "linkstatus_adminup"},
+		{"AdminDown", AdminDown, "linkstatus_admindown"},
+		{"CarrierUp", CarrierUp, "linkstatus_carrierup"},
+		{"CarrierDown", CarrierDown, "linkstatus_carrierdown"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := tt.in.String(); got != tt.want {
+				t.Errorf("String() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}
+
+func TestChanged(t *testing.T) {
+	tests := []struct {
+		name   string
+		flags  uint32
+		change uint32
+		want   []Types
+	}{
+		{
+			name:   "no_change",
+			flags:  0,
+			change: 0,
+			want:   nil,
+		},
+		{
+			name:   "admin_up",
+			flags:  unix.IFF_UP,
+			change: unix.IFF_UP,
+			want:   []Types{AdminUp},
+		},
+		{
+			name:   "admin_down",
+			flags:  0,
+			change: unix.IFF_UP,
+			want:   []Types{AdminDown},
+		},
+		{
+			name:   "carrier_up",
+			flags:  unix.IFF_LOWER_UP,
+			change: unix.IFF_LOWER_UP,
+			want:   []Types{CarrierUp},
+		},
+		{
+			name:   "carrier_down",
+			flags:  0,
+			change: unix.IFF_LOWER_UP,
+			want:   []Types{CarrierDown},
+		},
+		{
+			name:   "admin_and_carrier_up",
+			flags:  unix.IFF_UP | unix.IFF_LOWER_UP,
+			change: unix.IFF_UP | unix.IFF_LOWER_UP,
+			want:   []Types{AdminUp, CarrierUp},
+		},
+		{
+			name:   "admin_down_carrier_up",
+			flags:  unix.IFF_LOWER_UP,
+			change: unix.IFF_UP | unix.IFF_LOWER_UP,
+			want:   []Types{AdminDown, CarrierUp},
+		},
+		{
+			name:   "ignore_irrelevant_change_bits",
+			flags:  0,
+			change: unix.IFF_PROMISC,
+			want:   nil,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := Changed(tt.flags, tt.change)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Changed(%#x, %#x) = %#v, want %#v", tt.flags, tt.change, got, tt.want)
+			}
+		})
+	}
+}
+
+func TestFlagsRaw(t *testing.T) {
+	tests := []struct {
+		name  string
+		flags uint32
+		want  []string
+	}{
+		{
+			name:  "invalid_zero",
+			flags: 0,
+			want:  []string{"unknown"},
+		},
+		{
+			name:  "admin_up_carrier_up",
+			flags: unix.IFF_UP | unix.IFF_LOWER_UP,
+			want:  []string{"linkstatus_adminup", "linkstatus_carrierup"},
+		},
+		{
+			name:  "admin_down_carrier_down",
+			flags: unix.IFF_BROADCAST, // 非 0，且不含 IFF_UP/IFF_LOWER_UP
+			want:  []string{"linkstatus_admindown", "linkstatus_carrierdown"},
+		},
+		{
+			name:  "admin_up_carrier_down",
+			flags: unix.IFF_UP,
+			want:  []string{"linkstatus_adminup", "linkstatus_carrierdown"},
+		},
+		{
+			name:  "admin_down_carrier_up",
+			flags: unix.IFF_LOWER_UP,
+			want:  []string{"linkstatus_admindown", "linkstatus_carrierup"},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := FlagsRaw(tt.flags)
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("FlagsRaw(%#x) = %#v, want %#v", tt.flags, got, tt.want)
+			}
+		})
+	}
+}