<PackageReference Include="NUnit" Version="4.4.0-beta.2.1" />

System.Runtime.CompilerServices.CallerArgumentExpressionAttribute

Indicates that a parameter captures the expression passed for another parameter as a string.
namespace System.Runtime.CompilerServices { internal sealed class CallerArgumentExpressionAttribute : Attribute { public string ParameterName { get; } public CallerArgumentExpressionAttribute(string parameterName); } }