test: add test for bug fix PR #2415

test/common/utils/quill_test_app.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_quill/flutter_quill.dart';
+import 'package:flutter_quill/internal.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+/// A utility for testing widgets within an application widget configured with
+/// the necessary localizations.
+///
+/// Simplifies test setup, enabling concise test cases such as:
+///
+/// ```dart
+/// testWidgets('Test description', (tester) async {
+///   final exampleWidget = ...;
+///   await tester.pumpWidget(QuillTestApp.withScaffold(exampleWidget));
+/// });
+/// ```
+///
+/// Instead of requiring the verbose setup:
+///
+/// ```dart
+/// testWidgets('Test description', (tester) async {
+///   final exampleWidget = ...;
+///   await tester.pumpWidget(MaterialApp(
+///     localizationsDelegates: FlutterQuillLocalizations.localizationsDelegates,
+///     supportedLocales: FlutterQuillLocalizations.supportedLocales,
+///     home: Scaffold(body: exampleWidget),
+///   ));
+/// });
+/// ```
+class QuillTestApp extends StatelessWidget {
+  /// Constructs a [QuillTestApp] instance.
+  ///
+  /// Either [home] or [scaffoldBody] must be provided.
+  /// Throws an [ArgumentError] if both are provided.
+  QuillTestApp({
+    required this.home,
+    required this.scaffoldBody,
+    super.key,
+  }) {
+    if (home != null && scaffoldBody != null) {
+      throw ArgumentError('Either the home or scaffoldBody must be null');
+    }
+  }
+
+  /// Creates a [QuillTestApp] with a [Scaffold] wrapping the given [body] widget.
+  factory QuillTestApp.withScaffold(Widget body) =>
+      QuillTestApp(home: null, scaffoldBody: body);
+
+  /// Creates a [QuillTestApp] with the specified [home] widget.
+  factory QuillTestApp.home(Widget home) =>
+      QuillTestApp(home: home, scaffoldBody: null);
+
+  /// The home widget for the application.
+  ///
+  /// If [home] is not null, [scaffoldBody] must be null.
+  final Widget? home;
+
+  /// The body widget for a [Scaffold] used as the application home.
+  ///
+  /// If [scaffoldBody] is not null, [home] must be null.
+  final Widget? scaffoldBody;
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      localizationsDelegates: FlutterQuillLocalizations.localizationsDelegates,
+      supportedLocales: FlutterQuillLocalizations.supportedLocales,
+      home: home ??
+          Scaffold(
+            body: scaffoldBody,
+          ),
+    );
+  }
+}
+
+extension LocalizationsExt on WidgetTester {
+  /// Retrieves the localizations during a test.
+  ///
+  /// Example usage:
+  ///
+  /// ```dart
+  /// testWidgets('Verifies localized text', (tester) async {
+  ///   final localizations = tester.localizationsFromElement(ImageOptionsMenu);
+  ///
+  ///   expect(find.text(localizations.successImageDownloaded), findsOneWidget);
+  /// });
+  /// ```
+  FlutterQuillLocalizations localizationsFromElement(Type type) =>
+      (element(find.byType(type)) as BuildContext).loc;
+}

test/toolbar/buttons/color/color_dialog_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_quill/flutter_quill.dart';
+import 'package:flutter_quill/src/editor_toolbar_shared/color.dart';
+import 'package:flutter_quill/src/toolbar/buttons/color/color_dialog.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../../../common/utils/quill_test_app.dart';
+
+void main() {
+  group('$ColorPickerDialog', () {
+    testWidgets(
+        'hexController is initialized correctly after selectedColor when isToggledColor is true',
+        (tester) async {
+      for (final isBackground in {true, false}) {
+        const Color exampleColor = Colors.red;
+        final colorHex = colorToHex(exampleColor);
+
+        final selectionStyle = const Style().put(
+          Attribute(
+            isBackground ? Attribute.background.key : Attribute.color.key,
+            AttributeScope.inline,
+            colorHex,
+          ),
+        );
+        final widget = ColorPickerDialog(
+          isBackground: isBackground,
+          onRequestChangeColor: (context, color) {},
+          isToggledColor: true,
+          selectionStyle: selectionStyle,
+        );
+
+        await tester.pumpWidget(QuillTestApp.withScaffold(widget));
+
+        expect(find.widgetWithText(TextFormField, colorHex), findsOneWidget);
+
+        final state = tester.state(find.byType(ColorPickerDialog))
+            as ColorPickerDialogState;
+
+        final selectedColor = hexToColor(state.hexController.text);
+
+        expect(state.selectedColor, equals(selectedColor));
+        expect(state.hexController.text, equals(colorToHex(selectedColor)));
+      }
+    });
+  });
+}