feat: pr suggestions

lib/game/bloc/game_event.dart

@@ -34,7 +34,11 @@ class Scored extends GameEvent {
 }
 
 class BonusLetterActivated extends GameEvent {
-  const BonusLetterActivated(this.letterIndex);
+  const BonusLetterActivated(this.letterIndex)
+      : assert(
+          letterIndex < GameBloc.bonusWord.length,
+          'Index must be smaller than the length of the word',
+        );
 
   final int letterIndex;
 

test/game/bloc/game_event_test.dart

@@ -56,6 +56,16 @@ void main() {
           isNot(equals(BonusLetterActivated(1))),
         );
       });
+
+      test(
+        'throws assertion error if index is bigger than the word length',
+        () {
+          expect(
+            () => BonusLetterActivated(8),
+            throwsAssertionError,
+          );
+        },
+      );
     });
   });
 }