chore: import clean Agent Desk snapshot (2/7)

internal/ai/language_test.go

@@ -0,0 +1,46 @@
+package ai
+
+import (
+	"testing"
+)
+
+func TestDetectLanguage(t *testing.T) {
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{"Russian greeting", "Здравствуйте, подскажите статус заказа", "ru"},
+		{"Russian short", "Привет!", "ru"},
+		{"English inquiry", "Hello, can you help me with a refund?", "en"},
+		{"Chinese inquiry", "你好，请问怎么办理退款？", "zh"},
+		{"Mixed Russian and English", "Привет, check this please", "ru"},
+		{"Mixed Chinese and English", "你好 hello world", "zh"},
+		{"Numbers only", "12345 67890", "en"},
+		{"Empty string", "", "en"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := DetectLanguage(tt.input)
+			if got != tt.expected {
+				t.Errorf("DetectLanguage(%q) = %q, want %q", tt.input, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestIsCyrillicAndIsHan(t *testing.T) {
+	if !IsCyrillic("Привет") {
+		t.Errorf("IsCyrillic('Привет') should be true")
+	}
+	if IsCyrillic("Hello world") {
+		t.Errorf("IsCyrillic('Hello world') should be false")
+	}
+	if !IsHan("你好世界") {
+		t.Errorf("IsHan('你好世界') should be true")
+	}
+	if IsHan("Hello world") {
+		t.Errorf("IsHan('Hello world') should be false")
+	}
+}