<PackageReference Include="NUnit" Version="4.2.2" />

NUnit.Framework.Interfaces.ISimpleTestBuilder

public interface ISimpleTestBuilder
The ISimpleTestBuilder interface is exposed by a class that knows how to build a single tests from a specified method. In general, it is exposed by an attribute, but it may be implemented in a helper class used by the attribute in some cases.
namespace NUnit.Framework.Interfaces { public interface ISimpleTestBuilder { TestMethod BuildFrom(IMethodInfo method, Test suite); } }