<PackageReference Include="NUnit" Version="4.6.1" />

NUnit.Framework.CultureAttribute

Marks an assembly, test fixture or test method as applying to a specific Culture.
namespace NUnit.Framework { public class CultureAttribute : IncludeExcludeAttribute, IApplyToTest { public CultureAttribute(); public CultureAttribute(string cultures); public void ApplyToTest(Test test); public bool IsCultureSupported(string culture); public bool IsCultureSupported(string[] cultures); } }