@VisibleForTesting
void addLetterToAnswer(String letter) {
String answer = answerView.getRaw();
answer += letter;
switch (letterType) {
case Alphabet:
break;
case Hiragana:
answer = StringUtils.convertLastAlphabetToKana(answer, LetterType.Hiragana);
break;
case Katakana:
answer = StringUtils.convertLastAlphabetToKana(answer, LetterType.Katakana);
break;
}
answerView.set(answer, true);
}
