feat: made GameEvent support value equality

lib/game/bloc/game_event.dart

@@ -1,13 +1,16 @@
 part of 'game_bloc.dart';
 
 @immutable
-abstract class GameEvent {
+abstract class GameEvent extends Equatable {
   const GameEvent();
 }
 
 /// Event added when a user drops a ball off the screen.
 class BallLost extends GameEvent {
   const BallLost();
+
+  @override
+  List<Object?> get props => [];
 }
 
 /// Event added when a user increases their score.
@@ -17,4 +20,7 @@ class Scored extends GameEvent {
   }) : assert(points > 0, 'Points must be greater than 0');
 
   final int points;
+
+  @override
+  List<Object?> get props => [points];
 }

test/game/bloc/game_event_test.dart

@@ -7,6 +7,10 @@ void main() {
       test('can be instantiated', () {
         expect(const BallLost(), isNotNull);
       });
+
+      test('supports value equality', () {
+        expect(const BallLost(), equals(const BallLost()));
+      });
     });
 
     group('Scored', () {
@@ -14,6 +18,10 @@ void main() {
         expect(const Scored(points: 1), isNotNull);
       });
 
+      test('supports value equality', () {
+        expect(const Scored(points: 1), equals(const Scored(points: 1)));
+      });
+
       test(
           'throws AssertionError '
           'when score is smaller than 1', () {