<PackageReference Include="NUnit" Version="4.1.0" />

IApplyToTestSuite

public interface IApplyToTestSuite
The IApplyToTestSuite interface is implemented by self-applying attributes that modify the state of a test suite in some way.
using NUnit.Framework.Internal; using System.Runtime.CompilerServices; namespace NUnit.Framework.Interfaces { [System.Runtime.CompilerServices.NullableContext(1)] public interface IApplyToTestSuite { void ApplyToTestSuite(TestSuite testSuite); } }