chore: create PinballButton

lib/game/view/widgets/pinball_button.dart

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+import 'package:flutter/material.dart';
+import 'package:pinball/gen/gen.dart';
+
+/// {@template pinball_button}
+/// Pinball button with onPressed [VoidCallback] and child [Widget].
+/// {@endtemplate}
+class PinballButton extends StatelessWidget {
+  /// {@macro pinball_button}
+  const PinballButton({
+    Key? key,
+    required this.child,
+    this.onPressed,
+  }) : super(key: key);
+
+  /// Child displayed on button.
+  final Widget child;
+
+  /// On pressed callback used for user integration.
+  final VoidCallback? onPressed;
+
+  @override
+  Widget build(BuildContext context) {
+    return InkWell(
+      onTap: onPressed,
+      child: DecoratedBox(
+        decoration: BoxDecoration(
+          image: DecorationImage(
+            image: AssetImage(
+              Assets.images.selectCharacter.pinballButton.keyName,
+            ),
+          ),
+        ),
+        child: Center(
+          child: Padding(
+            padding: const EdgeInsets.symmetric(
+              horizontal: 32,
+              vertical: 16,
+            ),
+            child: child,
+          ),
+        ),
+      ),
+    );
+  }
+}

test/game/view/widgets/pinball_button_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pinball/game/game.dart';
+
+import '../../../helpers/helpers.dart';
+
+void main() {
+  const buttonText = 'this is the button text';
+
+  testWidgets('displays button', (tester) async {
+    await tester.pumpApp(
+      const Material(
+        child: PinballButton(
+          child: Text(buttonText),
+        ),
+      ),
+    );
+
+    expect(find.text(buttonText), findsOneWidget);
+  });
+
+  testWidgets('on tap calls onPressed callback', (tester) async {
+    var isTapped = false;
+
+    await tester.pumpApp(
+      Material(
+        child: PinballButton(
+          child: const Text(buttonText),
+          onPressed: () {
+            isTapped = true;
+          },
+        ),
+      ),
+    );
+    await tester.tap(find.text(buttonText));
+
+    expect(isTapped, isTrue);
+  });
+}