@Override
    public String createRandomNickname() {
        return NicknamePrefix.getPrefix() +
                NicknameCandidate.getCandidate() +
                "_" +
                generateUUID();

    }
@Test
    void 닉네임이_성공적으로_생성된다() {
        // when
        String createdNickname = nicknameGenerator.createRandomNickname();

        // then
        assertThat(createdNickname).isNotBlank();
    }