Step 1 test learning #7
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1단계 학습테스트 연습 및 실습
String 클래스에 대한 학습 테스트
-- "1,2"을 ,로 split 학습 테스트 완료
-- "(1,2)" 주어 졌을때 subString 학습 테스트 완료
-- String 값에 charaAt 해서 특정 위치 char 값 추출 학습 테스트 완료
Set Collection에 대한 학습 테스트
-- set의 size 메서드 학습 테스트 완료
-- set의 contain 메서드 학습 테스트 완료
--- 중복 코드 ParameterizedTest 적용 완료
-- contains 에 없는 값을 넣어서 false를 반환하게끔 만드는 테스트 완료