dotnet/tests/CommunityToolkit.HighPerformance.UnitTests/Streams/Test_MemoryStream.ThrowExceptions.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System;
using System.IO;
using System.Linq;
using CommunityToolkit.HighPerformance;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace CommunityToolkit.HighPerformance.UnitTests.Streams;

public partial class Test_MemoryStream
{
    [TestMethod]
    public void Test_MemoryStream_ParameterName_ThrowArgumentExceptionForPosition()
    {
        Stream? stream = new byte[10].AsMemory().AsStream();

        try
        {
            stream.Position = -1;
        }
        catch (ArgumentOutOfRangeException e) when (e.GetType() == typeof(ArgumentOutOfRangeException))
        {
            Assert.AreEqual(nameof(Stream.Position), e.ParamName);

            return;
        }

        Assert.Fail("Failed to raise correct exception");
    }

    [TestMethod]
    public void Test_MemoryStream_ParameterName_ThrowArgumentExceptionForSeekOrigin()
    {
        Stream? stream = new byte[10].AsMemory().AsStream();

        try
        {
            _ = stream.Seek(0, (SeekOrigin)int.MinValue);
        }
        catch (ArgumentException e) when (e.GetType() == typeof(ArgumentException))
        {
            System.Reflection.MethodInfo? method = stream.GetType().GetMethod(nameof(Stream.Seek));
            string? name = method!.GetParameters()[1].Name;

            Assert.AreEqual(e.ParamName, name);

            return;
        }

        Assert.Fail("Failed to raise correct exception");
    }

    [TestMethod]
    public void Test_MemoryStream_ParameterName_ThrowArgumentNullExceptionForNullBuffer()
    {
        Stream? stream = new byte[10].AsMemory().AsStream();

        try
        {
            stream.Write(null!, 0, 10);
        }
        catch (ArgumentNullException e) when (e.GetType() == typeof(ArgumentNullException))
        {
            string? name = (
                from method in typeof(Stream).GetMethods()
                where method.Name == nameof(Stream.Write)
                let normalParams = method.GetParameters()
                where
                    normalParams.Length == 3 &&
                    normalParams[0].ParameterType == typeof(byte[]) &&
                    normalParams[1].ParameterType == typeof(int) &&
                    normalParams[2].ParameterType == typeof(int)
                select normalParams[0].Name).Single();

            Assert.AreEqual(e.ParamName, name);

            return;
        }

        Assert.Fail("Failed to raise correct exception");
    }

    [TestMethod]
    public void Test_MemoryStream_ParameterName_ThrowArgumentOutOfRangeExceptionForNegativeOffset()
    {
        Stream? stream = new byte[10].AsMemory().AsStream();

        try
        {
            stream.Write(new byte[1], -1, 10);
        }
        catch (ArgumentOutOfRangeException e) when (e.GetType() == typeof(ArgumentOutOfRangeException))
        {
            string? name = (
                from method in typeof(Stream).GetMethods()
                where method.Name == nameof(Stream.Write)
                let normalParams = method.GetParameters()
                where
                    normalParams.Length == 3 &&
                    normalParams[0].ParameterType == typeof(byte[]) &&
                    normalParams[1].ParameterType == typeof(int) &&
                    normalParams[2].ParameterType == typeof(int)
                select normalParams[1].Name).Single();

            Assert.AreEqual(e.ParamName, name);

            return;
        }

        Assert.Fail("Failed to raise correct exception");
    }

    [TestMethod]
    public void Test_MemoryStream_ParameterName_ThrowArgumentOutOfRangeExceptionForNegativeCount()
    {
        Stream? stream = new byte[10].AsMemory().AsStream();

        try
        {
            stream.Write(new byte[1], 0, -1);
        }
        catch (ArgumentOutOfRangeException e) when (e.GetType() == typeof(ArgumentOutOfRangeException))
        {
            string? name = (
                from method in typeof(Stream).GetMethods()
                where method.Name == nameof(Stream.Write)
                let normalParams = method.GetParameters()
                where
                    normalParams.Length == 3 &&
                    normalParams[0].ParameterType == typeof(byte[]) &&
                    normalParams[1].ParameterType == typeof(int) &&
                    normalParams[2].ParameterType == typeof(int)
                select normalParams[2].Name).Single();

            Assert.AreEqual(e.ParamName, name);

            return;
        }

        Assert.Fail("Failed to raise correct exception");
    }

    [TestMethod]
    public void Test_MemoryStream_ParameterName_ThrowArgumentExceptionForExceededBufferSize()
    {
        Stream? stream = new byte[10].AsMemory().AsStream();

        try
        {
            stream.Write(new byte[1], 0, 10);
        }
        catch (ArgumentException e) when (e.GetType() == typeof(ArgumentException))
        {
            string? name = (
                from method in typeof(Stream).GetMethods()
                where method.Name == nameof(Stream.Write)
                let normalParams = method.GetParameters()
                where
                    normalParams.Length == 3 &&
                    normalParams[0].ParameterType == typeof(byte[]) &&
                    normalParams[1].ParameterType == typeof(int) &&
                    normalParams[2].ParameterType == typeof(int)
                select normalParams[0].Name).Single();

            Assert.AreEqual(e.ParamName, name);

            return;
        }

        Assert.Fail("Failed to raise correct exception");
    }
}