127 lines
5.1 KiB
Java
127 lines
5.1 KiB
Java
package com.accounting.util;
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import org.junit.jupiter.api.DisplayName;
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import org.junit.jupiter.api.Test;
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import java.math.BigDecimal;
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import java.time.LocalDate;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertFalse;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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/**
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* 减重计划计算测试。
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*
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* <p>这块是「设置目标 → 每周该减多少」的核心算术，也是最容易出现
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* 边界问题的地方：同日、超期、目标比起始还重、除零。所以边界用例
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* 写得比正常用例还多。</p>
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*/
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class WeightPlanCalculatorTest {
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@Test
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@DisplayName("三个月 65→58kg：总减 7kg 分到 13 周，每周 0.54kg")
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void weeklyLossForThreeMonths() {
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LocalDate start = LocalDate.of(2026, 1, 1);
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LocalDate target = LocalDate.of(2026, 4, 1); // 90 天
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int weeks = WeightPlanCalculator.totalWeeks(start, target);
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assertEquals(13, weeks);
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BigDecimal weekly = WeightPlanCalculator.weeklyLoss(
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new BigDecimal("65"), new BigDecimal("58"), weeks);
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assertEquals(new BigDecimal("0.54"), weekly);
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}
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@Test
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@DisplayName("总天数除不尽 7 时向上取整 —— 少算一周会让每周目标偏轻")
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void roundsUpPartialWeek() {
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// 8 天 = 1 周 + 1 天，应该算 2 周而不是 1 周
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assertEquals(2, WeightPlanCalculator.totalWeeks(
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LocalDate.of(2026, 1, 1), LocalDate.of(2026, 1, 9)));
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// 6 天算 1 周
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assertEquals(1, WeightPlanCalculator.totalWeeks(
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LocalDate.of(2026, 1, 1), LocalDate.of(2026, 1, 7)));
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}
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@Test
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@DisplayName("同日或倒填日期都算 1 周，不除零")
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void sameDayFallsBackToOneWeek() {
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LocalDate day = LocalDate.of(2026, 1, 1);
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assertEquals(1, WeightPlanCalculator.totalWeeks(day, day));
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// 目标日期早于开始日期也不该崩
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assertEquals(1, WeightPlanCalculator.totalWeeks(day, day.minusDays(5)));
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// 1 周减 7kg 是个荒谬的值，但必须是个数、不能是异常
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assertEquals(new BigDecimal("7.00"), WeightPlanCalculator.weeklyLoss(
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new BigDecimal("65"), new BigDecimal("58"), 1));
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}
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@Test
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@DisplayName("目标比起始还重时每周应减为 0，不能是负数")
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void gainingWeightGivesZeroNotNegative() {
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// 负数会让进度条宽度算反、也会让「每周应减」显示成 -0.5kg
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assertEquals(BigDecimal.ZERO, WeightPlanCalculator.weeklyLoss(
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new BigDecimal("58"), new BigDecimal("65"), 13));
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assertEquals(BigDecimal.ZERO, WeightPlanCalculator.weeklyLoss(
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new BigDecimal("60"), new BigDecimal("60"), 13));
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}
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@Test
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@DisplayName("理想体重曲线：第 0 周是起始体重，最后一周落在目标上")
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void idealCurveEndsAtTarget() {
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BigDecimal start = new BigDecimal("65");
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BigDecimal target = new BigDecimal("58");
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BigDecimal weekly = new BigDecimal("0.54");
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assertEquals(new BigDecimal("65.0"),
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WeightPlanCalculator.idealWeightAt(start, target, weekly, 0));
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// 第 13 周：65 - 0.54*13 = 57.98，低于目标 58 → 应该钉在 58
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assertEquals(new BigDecimal("58"),
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WeightPlanCalculator.idealWeightAt(start, target, weekly, 13));
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}
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@Test
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@DisplayName("理想体重不会跌破目标 —— 否则参照线会穿到目标下方")
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void idealWeightNeverGoesBelowTarget() {
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BigDecimal target = new BigDecimal("58");
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// 刻意给一个过大的每周减重
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BigDecimal ideal = WeightPlanCalculator.idealWeightAt(
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new BigDecimal("65"), target, new BigDecimal("2.0"), 10);
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assertEquals(target, ideal);
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}
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@Test
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@DisplayName("时间进度：未开始 0、进行中在 0~1、超期封顶 1.0")
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void timeProgressIsClamped() {
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LocalDate start = LocalDate.of(2026, 1, 1);
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LocalDate target = LocalDate.of(2026, 1, 11); // 10 天
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// 还没开始
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assertEquals(0.0, WeightPlanCalculator.timeProgress(start, target,
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LocalDate.of(2025, 12, 20)));
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// 正中间
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assertEquals(0.5, WeightPlanCalculator.timeProgress(start, target,
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LocalDate.of(2026, 1, 6)), 0.001);
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// 已超期：封顶 1.0，不是 1.5 —— 进度条宽度不能溢出
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assertEquals(1.0, WeightPlanCalculator.timeProgress(start, target,
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LocalDate.of(2026, 3, 1)));
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}
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@Test
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@DisplayName("每周超过 1kg 会被标记成不健康")
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void flagsUnhealthyPace() {
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// 65→58 只用 3 周 = 每周 2.33kg
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BigDecimal weekly = WeightPlanCalculator.weeklyLoss(
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new BigDecimal("65"), new BigDecimal("58"), 3);
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assertTrue(weekly.compareTo(WeightPlanCalculator.HEALTHY_WEEKLY_LOSS_KG) > 0);
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// 正常节奏不该被标
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BigDecimal healthy = WeightPlanCalculator.weeklyLoss(
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new BigDecimal("65"), new BigDecimal("58"), 13);
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assertFalse(healthy.compareTo(WeightPlanCalculator.HEALTHY_WEEKLY_LOSS_KG) > 0);
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}
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}
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