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 = ;
             for (; i < parts.Length; i++)
             {
                 if (char.IsDigit(parts[i][]))
                 {
                     break;
                 }
             }

             var productName = string.Join("", parts, , 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 >  && netCoreAppIndex < assemblyPath.Length - )
                 return assemblyPath[netCoreAppIndex + ];
             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

             };
         }
     }
 }