provider: replace flag emojis with country codes in removeEmojisFromTags

adapter/provider/adapter_test.go

@@ -0,0 +1,45 @@
+package provider
+
+import (
+	"testing"
+
+	"github.com/sagernet/sing-box/option"
+)
+
+func TestFlagToCountryCodeAllFlags(t *testing.T) {
+	for first := 'A'; first <= 'Z'; first++ {
+		for second := 'A'; second <= 'Z'; second++ {
+			flag := string(rune(0x1F1E6+(first-'A'))) + string(rune(0x1F1E6+(second-'A')))
+			expected := string(first) + string(second)
+			result := flagToCountryCode(flag)
+			// flagToCountryCode appends a space
+			if result != expected+" " {
+				t.Errorf("flagToCountryCode(%q) = %q, want %q", expected, result, expected+" ")
+			}
+		}
+	}
+}
+
+func TestRemoveEmojisFromTags(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected string
+	}{
+		{"🇺🇸 United States", "US United States"},
+		{"🇷🇺 Россия", "RU Россия"},
+		{"🇩🇪 Germany 🚀", "DE Germany"},
+		{"🇫🇷🇬🇧 France-UK", "FR GB France-UK"},
+		{"No emojis here", "No emojis here"},
+		{"🌍 World", "World"},
+		{"🇯🇵 Tokyo ⚡ Fast", "JP Tokyo Fast"},
+		{"Germany 🇩🇪", "Germany DE"},
+		{"Server 🇺🇸 Node", "Server US Node"},
+	}
+	for _, tt := range tests {
+		opts := []option.Outbound{{Tag: tt.input}}
+		removeEmojisFromTags(opts)
+		if opts[0].Tag != tt.expected {
+			t.Errorf("removeEmojisFromTags(%q) = %q, want %q", tt.input, opts[0].Tag, tt.expected)
+		}
+	}
+}