.NET global usings for code and tests

Console.sln

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio Version 17
VisualStudioVersion = 17.0.31410.414
MinimumVisualStudioVersion = 10.0.40219.1
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Console", "Console\Console.csproj", "{14C9E029-8F1A-405A-9EA6-C19F9155EE93}"
EndProject
Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Console.Tests", "Console.Tests\Console.Tests.csproj", "{461065E4-6BF5-4323-ADF3-1AD8B6699910}"
EndProject
Global
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		Debug|Any CPU = Debug|Any CPU
		Release|Any CPU = Release|Any CPU
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		{14C9E029-8F1A-405A-9EA6-C19F9155EE93}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{14C9E029-8F1A-405A-9EA6-C19F9155EE93}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{14C9E029-8F1A-405A-9EA6-C19F9155EE93}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{14C9E029-8F1A-405A-9EA6-C19F9155EE93}.Release|Any CPU.Build.0 = Release|Any CPU
		{461065E4-6BF5-4323-ADF3-1AD8B6699910}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
		{461065E4-6BF5-4323-ADF3-1AD8B6699910}.Debug|Any CPU.Build.0 = Debug|Any CPU
		{461065E4-6BF5-4323-ADF3-1AD8B6699910}.Release|Any CPU.ActiveCfg = Release|Any CPU
		{461065E4-6BF5-4323-ADF3-1AD8B6699910}.Release|Any CPU.Build.0 = Release|Any CPU
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		SolutionGuid = {CD72F94B-2B4A-471C-9C61-06563D05B477}
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EndGlobal

Console.Tests\Console.Tests.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <IsPackable>false</IsPackable>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.10.0" />
    <PackageReference Include="xunit" Version="2.4.1" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />
  </ItemGroup>
</Project>

Console.Tests\UnitTest1.cs

namespace Console.Tests
{
    public class UnitTest1
    {
        [Fact]
        public void Test1()
        {
            Assert.True(DateTime.UtcNow > DateTime.MinValue);
        }
    }
}

Console\Console.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
  </PropertyGroup>
</Project>

Console\Program.cs

Console.WriteLine("Hello World!");

Directory.Build.props

<Project>
  <PropertyGroup>
    <LangVersion>preview</LangVersion>
    <NoWarn>$(NoWarn);CS0105</NoWarn>
  </PropertyGroup>
  <ItemGroup>
    <!-- Automatically add the GlobalUsings.cs file to all projects -->
    <Compile Include="$(MSBuildThisFileDirectory)\GlobalUsings.cs" />
  </ItemGroup>
</Project>

Directory.Build.targets

<Project>
  <!-- Automatically define TEST_PROJECT in all test projects -->
  <PropertyGroup Condition=" '$(IsTestProject)' == 'true' ">
    <DefineConstants>$(DefineConstants);TEST_PROJECT</DefineConstants>
  </PropertyGroup>
</Project>

GlobalUsings.cs

global using System;

// Add test-specific usings to all test projects
#if TEST_PROJECT
global using Xunit;
#endif