test: color tests

frontend/app_flowy/packages/appflowy_editor/test/extensions/color_extension_test.dart

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+import 'package:appflowy_editor/src/extensions/color_extension.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  group('ColorExtension::', () {
+    const white = Color(0XFFFFFFFF);
+    const black = Color(0XFF000000);
+    const blue = Color(0XFF000FFF);
+    const blueRgba = 'rgba(0, 15, 255, 255)';
+    test('ToRgbaString', () {
+      expect(blue.toRgbaString(), 'rgba(0, 15, 255, 255)');
+      expect(white.toRgbaString(), 'rgba(255, 255, 255, 255)');
+      expect(black.toRgbaString(), 'rgba(0, 0, 0, 255)');
+    });
+
+    test('tryFromRgbaString', () {
+      final color = ColorExtension.tryFromRgbaString(blueRgba);
+      expect(color, const Color.fromARGB(255, 0, 15, 255));
+    });
+
+    test('tryFromRgbaString - wrong rgba format return null', () {
+      const wrongRgba = 'abc(1,2,3,4)';
+      final color = ColorExtension.tryFromRgbaString(wrongRgba);
+      expect(color, null);
+    });
+
+    test('tryFromRgbaString - wrong length return null', () {
+      const wrongRgba = 'rgba(0, 15, 255)';
+      final color = ColorExtension.tryFromRgbaString(wrongRgba);
+      expect(color, null);
+    });
+
+    test('tryFromRgbaString - wrong values return null', () {
+      const wrongRgba = 'rgba(-12, 999, 1234, 619)';
+      final color = ColorExtension.tryFromRgbaString(wrongRgba);
+      expect(color, null);
+    });
+  });
+}