test: coverage for test isEnabled

lib/game/components/bonus_word.dart

@@ -116,7 +116,8 @@ class BonusLetter extends BodyComponent<PinballGame>
   final int _index;
 
   /// Indicates if [BonusLetter] could be activated on contact with [Ball].
-  /// Deactivated during animation of [GameBonus.word].
+  /// Deactivated during animation of [GameBonus.word] and reactivated once
+  /// animation is finished.
   bool isEnabled = true;
 
   @override

test/game/components/bonus_word_test.dart

@@ -300,12 +300,26 @@ void main() {
       test('calls ball.activate', () {
         final ball = MockBall();
         final bonusLetter = MockBonusLetter();
-
         final contactCallback = BonusLetterBallContactCallback();
+
+        when(() => bonusLetter.isEnabled).thenReturn(true);
+
         contactCallback.begin(ball, bonusLetter, MockContact());
 
         verify(bonusLetter.activate).called(1);
       });
+
+      test('do not call ball.activate when letter is disabled', () {
+        final ball = MockBall();
+        final bonusLetter = MockBonusLetter();
+        final contactCallback = BonusLetterBallContactCallback();
+
+        when(() => bonusLetter.isEnabled).thenReturn(false);
+
+        contactCallback.begin(ball, bonusLetter, MockContact());
+
+        verifyNever(bonusLetter.activate);
+      });
     });
   });
 }