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

IFixtureBuilder

public interface IFixtureBuilder
The IFixtureBuilder interface is exposed by a class that knows how to build test fixtures from a specified type. In general, it is exposed by an attribute, but it may be implemented in a helper class used by the attribute in some cases.
using NUnit.Framework.Internal; using System.Collections.Generic; using System.Runtime.CompilerServices; namespace NUnit.Framework.Interfaces { [NullableContext(1)] public interface IFixtureBuilder { IEnumerable<TestSuite> BuildFrom(ITypeInfo typeInfo); } }