TESTS

QWERTYkez.Mensura.Tests/AggregateUnitExtensionsTest.cs

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+using System.Reflection;
+
+namespace QWERTYkez.Mensura.Tests;
+
+public class AggregateUnitExtensionsTest
+{
+    // Вспомогательный метод для создания объекта Length.
+    // Если у вас используется фабричный метод (например, Length.FromMeters), замените код внутри.
+    private static Length CreateLength(double value) => value * Length._MilliMeter;
+
+    #region Инфраструктура Рефлексии (Invoker)
+
+    private delegate Length SpanDelegate(ReadOnlySpan<Length> units);
+    private delegate Length SpanNullableDelegate(ReadOnlySpan<Length?> units);
+
+    private static class Invoker
+    {
+        private static readonly Type ExtType;
+
+        static Invoker()
+        {
+            // Находим внутренний класс AggregateUnitExtensions в целевой сборке
+            ExtType = typeof(Length).Assembly.GetType("QWERTYkez.Mensura.Extensions.AggregateUnitExtensions")
+                ?? throw new InvalidOperationException("Не удалось найти класс AggregateUnitExtensions через рефлексию.");
+        }
+
+        public static Length InvokeSpan(string methodName, ReadOnlySpan<Length> data)
+        {
+            var method = FindMethod(methodName, typeof(ReadOnlySpan<>), isNullable: false);
+            var closedMethod = method.MakeGenericMethod(typeof(Length));
+            var del = closedMethod.CreateDelegate<SpanDelegate>();
+            return del(data);
+        }
+
+        public static Length InvokeSpanNullable(string methodName, ReadOnlySpan<Length?> data)
+        {
+            var method = FindMethod(methodName, typeof(ReadOnlySpan<>), isNullable: true);
+            var closedMethod = method.MakeGenericMethod(typeof(Length));
+            var del = closedMethod.CreateDelegate<SpanNullableDelegate>();
+            return del(data);
+        }
+
+        public static Length InvokeCollection(string methodName, Type genericContainer, object data, bool isNullable)
+        {
+            var method = FindMethod(methodName, genericContainer, isNullable);
+            var closedMethod = method.MakeGenericMethod(typeof(Length));
+            return (Length)closedMethod.Invoke(null, [data])!;
+        }
+
+        private static MethodInfo FindMethod(string name, Type genericContainerType, bool isNullable)
+        {
+            var methods = ExtType.GetMethods(BindingFlags.Static | BindingFlags.NonPublic | BindingFlags.Public)
+                .Where(m => m.Name == name);
+
+            foreach (var method in methods)
+            {
+                var parameters = method.GetParameters();
+                if (parameters.Length != 1) continue;
+
+                var paramType = parameters[0].ParameterType;
+                if (!paramType.IsGenericType) continue;
+
+                // Проверяем базовый контейнер (List<>, IEnumerable<>, ReadOnlySpan<>)
+                if (paramType.GetGenericTypeDefinition() != genericContainerType) continue;
+
+                // Проверяем внутренний аргумент типа на Nullable
+                var genericArgument = paramType.GetGenericArguments()[0];
+                bool currentIsNullable = genericArgument.IsGenericType &&
+                                        genericArgument.GetGenericTypeDefinition() == typeof(Nullable<>);
+
+                if (currentIsNullable == isNullable)
+                {
+                    return method;
+                }
+            }
+
+            throw new MethodAccessException($"Метод {name} для контейнера {genericContainerType.Name} (Nullable: {isNullable}) не найден.");
+        }
+    }
+
+    #endregion
+
+    #region Тесты для НЕ-выделяющих Nullable типов (Обычные структуры)
+
+    private readonly Length[] _standardData = [CreateLength(10), CreateLength(20), CreateLength(30)];
+    private readonly Length _expectedSum = CreateLength(60);
+    private readonly Length _expectedAvg = CreateLength(20);
+    private readonly Length _expectedMax = CreateLength(30);
+    private readonly Length _expectedMin = CreateLength(10);
+
+    [Theory]
+    [InlineData("Sum")]
+    [InlineData("Avg")]
+    [InlineData("Max")]
+    [InlineData("Min")]
+    public void StandardContainers_ShouldCalculateCorrectly(string operation)
+    {
+        // Набор ожидаемых значений
+        Length expected = operation switch
+        {
+            "Sum" => _expectedSum,
+            "Avg" => _expectedAvg,
+            "Max" => _expectedMax,
+            "Min" => _expectedMin,
+            _ => throw new ArgumentException(operation)
+        };
+
+        // 1. Тест ReadOnlySpan<T>
+        ReadOnlySpan<Length> span = _standardData;
+        Assert.Equal(expected, Invoker.InvokeSpan(operation, span));
+
+        // 2. Тест List<T>
+        var list = _standardData.ToList();
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(List<>), list, isNullable: false));
+
+        // 3. Тест IReadOnlyCollection<T>
+        IReadOnlyCollection<Length> readOnlyCollection = _standardData;
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IReadOnlyCollection<>), readOnlyCollection, isNullable: false));
+
+        // 4. Тест IEnumerable<T>
+        IEnumerable<Length> enumerable = _standardData.Select(x => x);
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IEnumerable<>), enumerable, isNullable: false));
+    }
+
+    #endregion
+
+    #region Тесты для Nullable типов (T?)
+
+    // Тестируем смесь значений с null-элементами
+    private readonly Length?[] _nullableData = [CreateLength(10), null, CreateLength(30)];
+    private readonly Length _expectedNullSum = CreateLength(40);
+    private readonly Length _expectedNullAvg = CreateLength(20); // 40 / 2 значения
+    private readonly Length _expectedNullMax = CreateLength(30);
+    private readonly Length _expectedNullMin = CreateLength(10);
+
+    [Theory]
+    [InlineData("Sum")]
+    [InlineData("Avg")]
+    [InlineData("Max")]
+    [InlineData("Min")]
+    public void NullableContainers_ShouldCalculateCorrectly(string operation)
+    {
+        Length expected = operation switch
+        {
+            "Sum" => _expectedNullSum,
+            "Avg" => _expectedNullAvg,
+            "Max" => _expectedNullMax,
+            "Min" => _expectedNullMin,
+            _ => throw new ArgumentException(operation)
+        };
+
+        // 1. Тест ReadOnlySpan<T?>
+        ReadOnlySpan<Length?> span = _nullableData;
+        Assert.Equal(expected, Invoker.InvokeSpanNullable(operation, span));
+
+        // 2. Тест List<T?>
+        var list = _nullableData.ToList();
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(List<>), list, isNullable: true));
+
+        // 3. Тест IReadOnlyCollection<T?>
+        IReadOnlyCollection<Length?> readOnlyCollection = _nullableData;
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IReadOnlyCollection<>), readOnlyCollection, isNullable: true));
+
+        // 4. Тест IEnumerable<T?>
+        IEnumerable<Length?> enumerable = _nullableData.Select(x => x);
+        Assert.Equal(expected, Invoker.InvokeCollection(operation, typeof(IEnumerable<>), enumerable, isNullable: true));
+    }
+
+    #endregion
+}