chore: create StarAnimation

lib/select_character/widgets/star_animation.dart

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+// ignore_for_file: public_member_api_docs
+
+import 'package:flame/flame.dart';
+import 'package:flame/sprite.dart';
+import 'package:flame/widgets.dart';
+import 'package:flutter/material.dart' hide Image;
+import 'package:pinball/gen/gen.dart';
+
+class StarAnimation extends StatelessWidget {
+  const StarAnimation._({
+    Key? key,
+    required this.imagePath,
+    required this.columns,
+    required this.rows,
+    required this.stepTime,
+  }) : super(key: key);
+
+  StarAnimation.starA({
+    Key? key,
+  }) : this._(
+          key: key,
+          imagePath: Assets.images.selectCharacter.starA.keyName,
+          columns: 36,
+          rows: 2,
+          stepTime: 1 / 18,
+        );
+
+  StarAnimation.starB({
+    Key? key,
+  }) : this._(
+          key: key,
+          imagePath: Assets.images.selectCharacter.starB.keyName,
+          columns: 36,
+          rows: 2,
+          stepTime: 1 / 36,
+        );
+
+  StarAnimation.starC({
+    Key? key,
+  }) : this._(
+          key: key,
+          imagePath: Assets.images.selectCharacter.starC.keyName,
+          columns: 72,
+          rows: 1,
+          stepTime: 1 / 24,
+        );
+
+  final String imagePath;
+  final int columns;
+  final int rows;
+  final double stepTime;
+
+  static Future<void> loadAssets() {
+    Flame.images.prefix = '';
+
+    return Flame.images.loadAll([
+      Assets.images.selectCharacter.starA.keyName,
+      Assets.images.selectCharacter.starB.keyName,
+      Assets.images.selectCharacter.starC.keyName,
+    ]);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final spriteSheet = SpriteSheet.fromColumnsAndRows(
+      image: Flame.images.fromCache(imagePath),
+      columns: columns,
+      rows: rows,
+    );
+    final animation = spriteSheet.createAnimation(
+      row: 0,
+      stepTime: stepTime,
+      to: spriteSheet.rows * spriteSheet.columns,
+    );
+
+    return SizedBox(
+      width: 30,
+      height: 30,
+      child: SpriteAnimationWidget(
+        animation: animation,
+      ),
+    );
+  }
+}

test/select_character/widgets/star_animation_test.dart

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+// ignore_for_file: invalid_use_of_protected_member
+
+import 'package:flame/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pinball/select_character/select_character.dart';
+
+import '../../helpers/helpers.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  group('loads SpriteAnimationWidget correctly for', () {
+    setUpAll(() async {
+      await StarAnimation.loadAssets();
+    });
+
+    testWidgets('starA', (tester) async {
+      await tester.pumpApp(
+        StarAnimation.starA(),
+      );
+      await tester.pump();
+
+      expect(find.byType(SpriteAnimationWidget), findsOneWidget);
+    });
+
+    testWidgets('starB', (tester) async {
+      await tester.pumpApp(
+        StarAnimation.starB(),
+      );
+      await tester.pump();
+
+      expect(find.byType(SpriteAnimationWidget), findsOneWidget);
+    });
+
+    testWidgets('starC', (tester) async {
+      await tester.pumpApp(
+        StarAnimation.starC(),
+      );
+      await tester.pump();
+
+      expect(find.byType(SpriteAnimationWidget), findsOneWidget);
+    });
+  });
+}