Merge pull request #12 from DutchCodingCompany/fix/color_converter_const

⚡ Added const constructor for color_converter.dart

Author: Guldem

lib/chopper/color_converter.dart

@@ -4,6 +4,9 @@ import 'package:freezed_annotation/freezed_annotation.dart';
 
 /// A class that implements JsonConverter to convert Color objects to and from JSON.
 class ColorConverter implements JsonConverter<Color, String> {
+  /// A class that implements JsonConverter to convert Color objects to and from JSON.
+  const ColorConverter();
+
   /// Converts a hexadecimal color string from JSON to a Color object.
   ///
   /// The input string [json] is expected to be a hexadecimal color string.

test/chopper/color_converter_test.dart

@@ -12,7 +12,7 @@ void main() {
     [const Color(0xFFFFFFFF), '#ffffffff'],
     [const Color(0xF1F1F1F1), '#f1f1f1f1'],
   ], (Color color, String expected) {
-    final result = ColorConverter().toJson(color);
+    final result = const ColorConverter().toJson(color);
 
     expect(result, expected);
   });
@@ -25,7 +25,7 @@ void main() {
     [const Color(0xF1F1F1F1), '#f1f1f1f1'],
     [const Color(0xFFFFFFFF), '#ffffff'],
   ], (Color expected, String json) {
-    final result = ColorConverter().fromJson(json);
+    final result = const ColorConverter().fromJson(json);
 
     expect(result, expected);
   });