TF-4171 Display tag in mailbox list

core/test/presentation/extensions/hex_color_extension_test.dart

@@ -0,0 +1,57 @@
+import 'package:core/presentation/extensions/hex_color_extension.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('HexColorExtension.toColor', () {
+    test('should convert 6-char hex (#RRGGBB) to Color with default alpha FF',
+        () {
+      final color = "#FF0000".toColor();
+      expect(color, const Color(0xFFFF0000));
+    });
+
+    test('should convert 8-char hex (#AARRGGBB) correctly', () {
+      final color = "#80FF0000".toColor();
+      expect(color, const Color(0x80FF0000));
+    });
+
+    test('should handle string without # prefix', () {
+      final color = "00FF00".toColor();
+      expect(color, const Color(0xFF00FF00));
+    });
+
+    test('should return fallback when hex is invalid', () {
+      const fallback = Colors.blue;
+      final color = "INVALID".toColor(fallback: fallback);
+      expect(color, fallback);
+    });
+
+    test('should return fallback when hex contains non-hex characters', () {
+      const fallback = Colors.red;
+      final color = "#GGHHHH".toColor(fallback: fallback);
+      expect(color, fallback);
+    });
+
+    test('should return fallback when hex length is unsupported', () {
+      const fallback = Colors.orange;
+      final color = "#FFF".toColor(fallback: fallback);
+      expect(color, fallback);
+    });
+
+    test('should return fallback for empty string', () {
+      const fallback = Colors.purple;
+      final color = "".toColor(fallback: fallback);
+      expect(color, fallback);
+    });
+
+    test('should convert lowercase hex', () {
+      final color = "#ff0000".toColor();
+      expect(color, const Color(0xFFFF0000));
+    });
+
+    test('should convert mixed-case hex', () {
+      final color = "#Ff00Ff".toColor();
+      expect(color, const Color(0xFFFf00Ff));
+    });
+  });
+}