public void checkDuplicateRowNumber(List<Integer> rowNumberList) {
        Set<Integer> rowNumberSet = new HashSet<>(rowNumberList);
        if (rowNumberSet.size() < rowNumberList.size()) {
            throw new InvalidBlockRowException();
        }
    }
@Test
    public void 열_생성_요청에_중복_열_번호가_있다면_에러를_반환한다() {
        // given
        List<Integer> rowNumbers = List.of(1, 2, 2);

        // when
        // then
        assertThatThrownBy(() -> createBlockService.checkDuplicateRowNumber(rowNumbers))
                .isInstanceOf(InvalidBlockRowException.class);
    }