카드 정산 업무 규칙과 전환 불변식 추출 #4
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package com.bais.card.settlement;
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import org.junit.jupiter.api.BeforeEach;
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import org.junit.jupiter.api.DisplayName;
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import org.junit.jupiter.api.Nested;
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import org.junit.jupiter.api.Test;
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import java.math.BigDecimal;
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import static org.junit.jupiter.api.Assertions.*;
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/**
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* SettlementCalculator 단위 테스트
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* 불변식 검증: BRAND_SETTLEMENT_*, IRD_*, ISSUER_FEE_*, AMOUNT_*, ROUNDING_MODE
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*/
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@DisplayName("SettlementCalculator 불변식 테스트")
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class SettlementCalculatorTest {
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private SettlementCalculator calculator;
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@BeforeEach
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void setUp() {
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calculator = new SettlementCalculator();
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}
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@Nested
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@DisplayName("브랜드 정산 불변식 테스트")
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class BrandSettlementTests {
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@Test
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@DisplayName("BRAND_SETTLEMENT_FORMULA: 정산금 = 승인금액 - 취소금액 - 수수료")
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void testSettlementFormula() {
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BigDecimal approved = new BigDecimal("100000");
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BigDecimal cancelled = new BigDecimal("10000");
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BigDecimal rate = new BigDecimal("0.02");
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SettlementCalculator.BrandSettlementResult result =
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calculator.calculateBrandSettlement(approved, cancelled, rate);
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assertEquals(new BigDecimal("2000.00"), result.getCommission());
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assertEquals(new BigDecimal("88000.00"), result.getSettlementAmount());
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}
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@Test
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@DisplayName("BRAND_SETTLEMENT_NON_NEGATIVE: 정산금은 0 이상")
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void testSettlementNonNegative() {
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SettlementCalculator.BrandSettlementResult result =
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calculator.calculateBrandSettlement(
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new BigDecimal("10000"), new BigDecimal("20000"), new BigDecimal("0.02"));
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assertEquals(BigDecimal.ZERO.setScale(2), result.getSettlementAmount());
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}
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@Test
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@DisplayName("BRAND_COMMISSION_RATE_DEFAULT: 미지정 시 0.02")
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void testDefaultCommissionRate() {
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SettlementCalculator.BrandSettlementResult result =
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calculator.calculateBrandSettlement(
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new BigDecimal("100000"), BigDecimal.ZERO, null);
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assertEquals(new BigDecimal("0.02"), result.getCommissionRate());
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}
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}
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@Nested
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@DisplayName("IRD 불변식 테스트")
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class IrdTests {
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@Test
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@DisplayName("IRD_FORMULA: IRD = 승인금액 * IRD율")
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void testIrdFormula() {
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BigDecimal ird = calculator.calculateIRD(
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new BigDecimal("100000"), new BigDecimal("0.015"));
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assertEquals(new BigDecimal("1500.00"), ird);
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}
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@Test
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@DisplayName("IRD_RATE_DEFAULT: 미지정 시 0.015")
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void testDefaultIrdRate() {
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BigDecimal ird = calculator.calculateIRD(new BigDecimal("100000"), null);
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assertEquals(new BigDecimal("1500.00"), ird);
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}
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@Test
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@DisplayName("IRD_NON_NEGATIVE: IRD는 0 이상")
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void testIrdNonNegative() {
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BigDecimal ird = calculator.calculateIRD(
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new BigDecimal("100000"), new BigDecimal("-0.015"));
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assertTrue(ird.compareTo(BigDecimal.ZERO) >= 0);
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}
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}
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@Nested
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@DisplayName("발급사 수수료 불변식 테스트")
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class IssuerFeeTests {
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@Test
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@DisplayName("ISSUER_FEE_FORMULA: 발급사 수수료 = IRD * 발급사 수수료율")
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void testIssuerFeeFormula() {
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BigDecimal fee = calculator.calculateIssuerFee(
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new BigDecimal("1500.00"), new BigDecimal("0.005"));
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assertEquals(new BigDecimal("7.50"), fee);
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}
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@Test
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@DisplayName("ISSUER_FEE_RATE_DEFAULT: 미지정 시 0.005")
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void testDefaultIssuerFeeRate() {
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BigDecimal fee = calculator.calculateIssuerFee(new BigDecimal("1500.00"), null);
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assertEquals(new BigDecimal("7.50"), fee);
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}
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@Test
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@DisplayName("ISSUER_SETTLEMENT_FORMULA: 발급사 정산금 = IRD - 발급사 수수료")
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void testIssuerSettlementFormula() {
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SettlementCalculator.IssuerSettlementResult result =
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calculator.calculateIssuerSettlement(
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new BigDecimal("1500.00"), new BigDecimal("0.005"));
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assertEquals(new BigDecimal("7.50"), result.getIssuerFee());
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assertEquals(new BigDecimal("1492.50"), result.getIssuerSettlement());
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}
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}
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@Nested
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@DisplayName("공통 금액 검증 불변식 테스트")
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class AmountValidationTests {
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@Test
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@DisplayName("AMOUNT_NOT_NULL: null 시 IllegalArgumentException")
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void testNullAmount() {
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assertThrows(IllegalArgumentException.class, () ->
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calculator.calculateBrandSettlement(null, BigDecimal.ZERO, new BigDecimal("0.02")));
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}
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@Test
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@DisplayName("AMOUNT_NON_NEGATIVE: 음수 시 IllegalArgumentException")
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void testNegativeAmount() {
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assertThrows(IllegalArgumentException.class, () ->
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calculator.calculateBrandSettlement(
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new BigDecimal("-100000"), BigDecimal.ZERO, new BigDecimal("0.02")));
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}
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@Test
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@DisplayName("AMOUNT_MAX_LIMIT: 최대 한도 초과 시 IllegalArgumentException")
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void testAmountExceedsMaxLimit() {
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BigDecimal exceedsMax = new BigDecimal("999999999999.99").add(BigDecimal.ONE);
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assertThrows(IllegalArgumentException.class, () ->
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calculator.calculateBrandSettlement(
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exceedsMax, BigDecimal.ZERO, new BigDecimal("0.02")));
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}
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}
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@Nested
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@DisplayName("금액 정밀도 불변식 테스트")
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class PrecisionTests {
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@Test
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@DisplayName("AMOUNT_SCALE: 소수점 2자리")
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void testAmountScale() {
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SettlementCalculator.BrandSettlementResult result =
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calculator.calculateBrandSettlement(
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new BigDecimal("100000"), BigDecimal.ZERO, new BigDecimal("0.023456"));
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assertEquals(2, result.getCommission().scale());
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assertEquals(new BigDecimal("2345.60"), result.getCommission());
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}
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@Test
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@DisplayName("ROUNDING_MODE: HALF_UP 반올림")
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void testHalfUpRounding() {
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SettlementCalculator.BrandSettlementResult result =
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calculator.calculateBrandSettlement(
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new BigDecimal("100000"), BigDecimal.ZERO, new BigDecimal("0.023455"));
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assertEquals(new BigDecimal("2345.50"), result.getCommission());
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}
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}
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@Nested
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@DisplayName("전체 정산 흐름 테스트")
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class FullSettlementTests {
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@Test
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@DisplayName("전체 정산 계산 통합 테스트")
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void testFullSettlement() {
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SettlementCalculator.FullSettlementResult result =
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calculator.calculateFullSettlement(
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new BigDecimal("100000"),
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new BigDecimal("10000"),
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new BigDecimal("0.02"),
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new BigDecimal("0.015"),
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new BigDecimal("0.005"));
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assertNotNull(result.getBrandSettlement());
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assertNotNull(result.getIrd());
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assertNotNull(result.getIssuerSettlement());
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assertEquals(new BigDecimal("1500.00"), result.getIrd());
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}
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}
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}
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