In-project unit tests c#

UnitTests.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net6.0</TargetFramework>
    <GenerateProgramFile>false</GenerateProgramFile>
    <!-- This stops c# from creating th stub main automatically -->
    <!-- https://andrewlock.net/fixing-the-error-program-has-more-than-one-entry-point-defined-for-console-apps-containing-xunit-tests/ -->
  </PropertyGroup>
  
   <ItemGroup Condition="'$(Configuration)' == 'Release'">
    <Compile Remove="**\*.Test.cs" />
  </ItemGroup>
   
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
    <PackageReference Include="xunit" Version="2.4.1" />
    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
    <PackageReference Include="coverlet.collector" Version="1.3.0">
      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
      <PrivateAssets>all</PrivateAssets>
    </PackageReference>
  </ItemGroup>

</Project>

using System;
using Xunit;

namespace MyFirstUnitTests
{
    public class UnitTest1
    {
        [Fact]
        public void Test1()
        {
                Assert.Equal(4, 2 + 2);
        }
    }
}