refactor: adapted equality test to pick coverage

test/game/bloc/game_event_test.dart

@@ -9,7 +9,8 @@ void main() {
       });
 
       test('supports value equality', () {
-        expect(const BallLost(), equals(const BallLost()));
+        // ignore: prefer_const_constructors
+        expect(BallLost(), equals(const BallLost()));
       });
     });
 
@@ -20,6 +21,7 @@ void main() {
 
       test('supports value equality', () {
         expect(const Scored(points: 1), equals(const Scored(points: 1)));
+        expect(const Scored(points: 1), isNot(equals(const Scored(points: 2))));
       });
 
       test(

test/game/bloc/game_state_test.dart

@@ -103,7 +103,7 @@ void main() {
             score: gameState.score + 1,
             balls: gameState.balls + 1,
           );
-          expect(gameState, isNot(otherGameState));
+          expect(gameState, isNot(equals(otherGameState)));
 
           expect(
             gameState.copyWith(