Задание 5: модульные тесты ProductCalculator

.gitignore

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README.md

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+# Вариативная часть. Задание 5: тестирование программных модулей
+ 
+Проект ShoeStore.Logic содержит класс ProductCalculator (Приложение 4), проект ShoeStore.Tests - модульные тесты MSTest.
+ 
+## Протокол тестирования
+ 
+Фреймворк модульного тестирования: MSTest (.NET 8).
+ 
+Порядок запуска тестов:
+1. Открыть решение в Visual Studio 2022.
+2. Меню «Тест» -> «Обозреватель тестов».
+3. Нажать «Запустить все тесты в представлении».
+ 
+Запуск из командной строки (в папке решения): dotnet test
+ 
+| № | Проверяемый случай | Входные данные | Ожидаемый результат | Фактический результат | Статус |
+|---|---|---|---|---|---|
+| 1 | Заказов в предыдущем месяце нет | Цена 2000; заказов нет; дата расчета 15.06.2027 | 1500 | 1500 | Пройден |
+| 2 | Есть заказ в предыдущем месяце | Цена 2000; заказ 10.05.2027; дата расчета 15.06.2027 | 2000 | 2000 | Пройден |
+| 3 | Граничное значение количества | Количество пар: 5 | мало | мало | Пройден |
+| 4 | Количество больше порогового | Количество пар: 6 | много | много | Пройден |

ShoeStore.Logic.slnx

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+<Solution>
+  <Project Path="ShoeStore.Logic/ShoeStore.Logic.csproj" />
+  <Project Path="ShoeStore.Tests/ShoeStore.Tests.csproj" Id="6931bd7f-91cb-43db-accd-4dac84140bbc" />
+</Solution>

ShoeStore.Logic/ProductCalculator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace ShoeStore.Logic
+{
+    /// <summary>
+    /// Расчет показателей товара для каталога.
+    /// </summary>
+    public static class ProductCalculator
+    {
+        public const decimal DiscountPercent = 25m;
+        public const int ManyQuantityThreshold = 5;
+
+        /// <summary>
+        /// Возвращает цену товара с учетом скидки.
+        /// Скидка 25% предоставляется, если в предыдущем календарном месяце
+        /// (относительно даты расчета) по товару не было заказов.
+        /// </summary>
+        /// <param name="price">Цена товара в рублях.</param>
+        /// <param name="orderDates">Даты заказов товара (может быть пустым).</param>
+        /// <param name="calculationDate">Дата расчета.</param>
+        public static decimal CalculateDiscountedPrice(decimal price, IEnumerable<DateTime> orderDates, DateTime calculationDate)
+        {
+            if (price < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(price), "Цена не может быть отрицательной.");
+            }
+            if (orderDates == null)
+            {
+                throw new ArgumentNullException(nameof(orderDates));
+            }
+
+            DateTime currentMonthStart = new DateTime(calculationDate.Year, calculationDate.Month, 1);
+            DateTime previousMonthStart = currentMonthStart.AddMonths(-1);
+            bool hasOrdersInPreviousMonth = orderDates.Any(date => date >= previousMonthStart && date < currentMonthStart);
+
+            if (hasOrdersInPreviousMonth)
+            {
+                return price;
+            }
+            return Math.Round(price * (100m - DiscountPercent) / 100m, 2);
+        }
+
+        /// <summary>
+        /// Возвращает признак количества: «много», если пар больше пяти, иначе «мало».
+        /// </summary>
+        /// <param name="totalQuantity">Количество пар суммарно по всем размерам.</param>
+        public static string GetQuantityLabel(int totalQuantity)
+        {
+            if (totalQuantity < 0)
+            {
+                throw new ArgumentOutOfRangeException(nameof(totalQuantity), "Количество не может быть отрицательным.");
+            }
+            return totalQuantity > ManyQuantityThreshold ? "много" : "мало";
+        }
+    }
+}

ShoeStore.Logic/ShoeStore.Logic.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

ShoeStore.Tests/MSTestSettings.cs

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+[assembly: Parallelize(Scope = ExecutionScope.MethodLevel)]

ShoeStore.Tests/ProductCalculatorTests.cs

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+using System;
+using System.Collections.Generic;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using ShoeStore.Logic;
+
+namespace ShoeStore.Tests
+{
+    [TestClass]
+    public class ProductCalculatorTests
+    {
+        // Случай 1: заказов в предыдущем месяце нет - цена со скидкой
+        [TestMethod]
+        public void CalculateDiscountedPrice_NoOrdersInPreviousMonth_ReturnsPriceWithDiscount()
+        {
+            decimal price = 2000m;
+            List<DateTime> orderDates = new List<DateTime>();
+            DateTime calculationDate = new DateTime(2027, 6, 15);
+
+            decimal result = ProductCalculator.CalculateDiscountedPrice(price, orderDates, calculationDate);
+
+            Assert.AreEqual(1500m, result);
+        }
+
+        // Случай 2: есть заказ в предыдущем месяце - цена без скидки
+        [TestMethod]
+        public void CalculateDiscountedPrice_OrderInPreviousMonth_ReturnsPriceWithoutDiscount()
+        {
+            decimal price = 2000m;
+            List<DateTime> orderDates = new List<DateTime> { new DateTime(2027, 5, 10) };
+            DateTime calculationDate = new DateTime(2027, 6, 15);
+
+            decimal result = ProductCalculator.CalculateDiscountedPrice(price, orderDates, calculationDate);
+
+            Assert.AreEqual(2000m, result);
+        }
+
+        // Случай 3: граничное значение - «мало»
+        [TestMethod]
+        public void GetQuantityLabel_FivePairs_ReturnsFew()
+        {
+            string result = ProductCalculator.GetQuantityLabel(5);
+
+            Assert.AreEqual("мало", result);
+        }
+
+        // Случай 4: больше порогового - «много»
+        [TestMethod]
+        public void GetQuantityLabel_SixPairs_ReturnsMany()
+        {
+            string result = ProductCalculator.GetQuantityLabel(6);
+
+            Assert.AreEqual("много", result);
+        }
+    }
+}

ShoeStore.Tests/ShoeStore.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MSTest" Version="4.5.2" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\ShoeStore.Logic\ShoeStore.Logic.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Using Include="Microsoft.VisualStudio.TestTools.UnitTesting" />
+  </ItemGroup>
+
+</Project>