单元测试如何覆盖internal的方法

在类的设计中经常会有类或者方法要设置成private或者internal等方式，在使用中这么做无可厚非，但是对单元测试的影响也颇大

1. 对于private方法，那只有做一个副本然后改成internal或public来测试
2. 对于internal的类和方法可以直接利用[assembly]标签来指定该类可以被哪个dll/方案读取

/*******************************************************************************
* File Name：  SoftwareInfoHelper.cs
* Namespace: 
*
* CreateTime: 2018/9/6 14:50
* Author：  linkanyway
* Description： SoftwareInfoHelper
* Class Name： SoftwareInfoHelper
*
* Ver ChangeDate Author Description
* ───────────────────────────────────
* V0.01 2018/9/6 14:50 linkanyway draft
*
* Copyright (c) 2018 linkanyway 
* Description: Framework
*
*********************************************************************************/

using System;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;


[assembly: InternalsVisibleTo("TestProject.Nirvana.Infrastructure")
]

namespace Nirvana.Infrastructure.Runtime
{
    /// <summary>
    /// SoftwareInfoHelper
    /// </summary>
    // ReSharper disable once UnusedMember.Global
    public static class SoftwareInfoHelper
    {
        /// <summary>
        /// Return correct .NET Core product name like ".NET Core 2.1.0" instead of ".NET Core 4.6.26515.07" returning by RuntimeInformation.FrameworkDescription
        /// </summary>
        /// <returns></returns>
        // ReSharper disable once UnusedMember.Global
        internal static string GetFrameworkDescription()
        {
            // ".NET Core 4.6.26515.07" => ".NET Core 2.1.0"
            // var parts = RuntimeInformation.FrameworkDescription.Split([' '], StringSplitOptions.RemoveEmptyEntries);
            var charSeparators = new[] {','};
            var parts = RuntimeInformation.FrameworkDescription.Split(charSeparators,
                StringSplitOptions.RemoveEmptyEntries);
            var i = 0;
            for (; i < parts.Length; i++)
            {
                if (char.IsDigit(parts[i][0]))
                {
                    break;
                }
            }

            var productName = string.Join("", parts, 0, i);
            return string.Join("", productName, " ", GetNetCoreVersion());
        }


        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        internal static string GetNetCoreVersion()
        {
            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;
            var assemblyPath = assembly.CodeBase.Split(new[] {'/', '\'}, StringSplitOptions.RemoveEmptyEntries);
            var netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");
            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)
                return assemblyPath[netCoreAppIndex + 1];
            return null;
        }


        
        /// <summary>
        /// 
        /// </summary>
        /// <returns></returns>
        public static PlatformInformation GetPlatformInformation()
        {
            OSPlatform platform;

            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                platform = OSPlatform.Windows;
            if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
                platform = OSPlatform.Linux;
            if (RuntimeInformation.IsOSPlatform(OSPlatform.OSX))
                platform = OSPlatform.OSX;
            return new PlatformInformation()
            {
                Architecture = RuntimeInformation.OSArchitecture,
                DotnetVersion = GetNetCoreVersion(),
                Os = platform,
                OsVersion = RuntimeInformation.OSDescription
                
            };
        }
    }
}