🚀 2단계 - 로또(자동) #994
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🚀 2단계 - 로또(자동) #994
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malibinYun
requested changes
Nov 28, 2023
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| private const val WINNER_REWARD = 2000000000 | ||
| private const val SECOND_REWARD = 1500000 | ||
| private const val THIRD_REWARD = 50000 | ||
| private const val FORTH_REWARD = 5000 | ||
| private const val LOTTO_PRICE = 1000 |
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로또 등수를 도메인 객체로 표현해보는 건 어떨까요? enum 등으로 구현해보셔도 좋겠어요 :)
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| fun match( | ||
| userLotto: Set<Int>, |
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Int에는 1~45 라는 로또 번호를 제한하기에는 너무 범용적인 자료형이라 생각해요.
로또 번호를 나타내는 도메인 객체를 만들어보는 건 어떨까요?
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| class LottoShop { | ||
| fun buy(count: Int): List<Set<Int>> { |
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컬렉션의 자료형 타입이 겹쳐져있으면 어떤 값을 의미하는지 쉽게 알아보기 어려워진다고 생각해요.
한 컬렉션을 객체로 묶어 의미를 담아보는 건 어떨까요?
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| @Test | ||
| fun `1등은 6개 일치` () { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(1, 2, 3, 4, 5, 6) | ||
| val winningLotto = setOf(1, 2, 3, 4, 5, 6) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 1 | ||
| } | ||
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| @Test | ||
| fun `2등은 5개 일치`() { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(1, 2, 3, 4, 5, 6) | ||
| val winningLotto = setOf(1, 2, 3, 4, 5, 7) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 2 | ||
| } | ||
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| @Test | ||
| fun `3등은 4개 일치`() { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(1, 2, 3, 4, 5, 6) | ||
| val winningLotto = setOf(1, 2, 3, 4, 7, 8) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 3 | ||
| } | ||
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| @Test | ||
| fun `4등은 3개 일치`() { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(1, 2, 3, 4, 5, 6) | ||
| val winningLotto = setOf(1, 2, 3, 7, 8, 9) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 4 | ||
| } | ||
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| @Test | ||
| fun `2개 경우 일치 하면 0`(userLotto: Set<Int>) { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(1, 2, 12, 13, 14, 15) | ||
| val winningLotto = setOf(1, 2, 3, 7, 8, 9) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 4 | ||
| } | ||
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| @Test | ||
| fun `1개 경우 일치 하면 0`(userLotto: Set<Int>) { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(1, 11, 12, 13, 14, 16) | ||
| val winningLotto = setOf(1, 2, 3, 7, 8, 9) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 4 | ||
| } | ||
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| @Test | ||
| fun `0개 경우 일치 하면 0`(userLotto: Set<Int>) { | ||
| val lottoGame = LottoGame() | ||
| val userLotto = setOf(10, 11, 12, 13, 14, 16) | ||
| val winningLotto = setOf(1, 2, 3, 7, 8, 9) | ||
| val actual = lottoGame.match(userLotto, winningLotto) | ||
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| actual shouldBe 4 | ||
| } |
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이런 형태의 테스트는 @ParameterizedTest를 활용해보는 건 어떨까요?
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| @Test | ||
| fun `로또 n장 사기`() { | ||
| val lottoShop = LottoShop() | ||
| val count = 5 | ||
| val lottos = lottoShop.buy(5) | ||
| lottos.size shouldBe count | ||
| } |
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몇 장을 샀는지 검증하는 것은 테스트에 큰 의미를 가지지 못한다고 생각해요.
개발자가 제어 가능한 형태로, 어떤 티켓이 반환되었는지까지 테스트할 수 있게 만들어보는 건 어떨까요?
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pr 드립니다.