add test for issue #53
add test for issue #53

krororo/review,kuad9/review_study,masawada/review,suzuki/review,murashitas/review,kuad9/review_study,kmuto/review,orangain/review,suzuki/review,kmuto/review,masawada/review,murashitas/review,kmuto/review,takahashim/review,krororo/review,krororo/review,takahashim/review,orangain/review