test(bot): added regression test for callback sender resolution

client/bot/handlers/middleware_test.go

@@ -0,0 +1,51 @@
+package handlers
+
+import (
+	"testing"
+
+	"github.com/celestix/gotgproto/ext"
+	"github.com/celestix/gotgproto/types"
+	"github.com/gotd/td/tg"
+)
+
+func TestResponsibleUserID(t *testing.T) {
+	tests := []struct {
+		name   string
+		update *ext.Update
+		want   int64
+	}{
+		{
+			name:   "callback query uses native user id",
+			update: &ext.Update{CallbackQuery: &tg.UpdateBotCallbackQuery{UserID: 42}},
+			want:   42,
+		},
+		{
+			name: "message resolves through entity map",
+			update: &ext.Update{
+				EffectiveMessage: &types.Message{Message: &tg.Message{PeerID: &tg.PeerUser{UserID: 7}}},
+				Entities:         &tg.Entities{Users: map[int64]*tg.User{7: {ID: 7}}},
+			},
+			want: 7,
+		},
+		{
+			name: "callback query ignores entity map",
+			update: &ext.Update{
+				CallbackQuery: &tg.UpdateBotCallbackQuery{UserID: 9},
+				Entities:      &tg.Entities{Users: map[int64]*tg.User{8: {ID: 8}}},
+			},
+			want: 9,
+		},
+		{
+			name:   "unresolvable update yields zero",
+			update: &ext.Update{},
+			want:   0,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := responsibleUserID(tt.update); got != tt.want {
+				t.Fatalf("responsibleUserID() = %d, want %d", got, tt.want)
+			}
+		})
+	}
+}