<PackageReference Include="NUnit" Version="4.3.2" />

NUnit.Framework.Internal.TestSuite

public class TestSuite : Test
TestSuite represents a composite test, which contains other tests.
namespace NUnit.Framework.Internal { public class TestSuite : Test { protected bool MaintainTestOrder { get; set; } public IMethodInfo[] OneTimeSetUpMethods { get; set; } public IMethodInfo[] OneTimeTearDownMethods { get; set; } public TestSuite(string name); public TestSuite(string parentSuiteName, string name); public TestSuite(ITypeInfo fixtureType, object[] arguments = null); public TestSuite(Type fixtureType); public TestSuite(TestSuite suite, ITestFilter filter); public void Sort(); public void Add(Test test); public virtual TestSuite Copy(ITestFilter filter); public void ApplyAttributesToTestSuite(Type type); protected void CheckSetUpTearDownMethods(IMethodInfo[] methods); } }