Java로 직접 구현하는 jUnit 예제 참고자료 https://www.eg.bucknell.edu/~cs475/F2000-S2001/hyde/JUnit/README.html https://www.eg.bucknell.edu/~cs475/F2000-S2001/hyde/JUnit/doc/cookbook.htm https://toby.epril.com/5 https://www.youtube.com/watch?v=tdKFZcZSJmg