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

NUnit.Framework.Internal.RuntimeFramework

public sealed class RuntimeFramework
RuntimeFramework represents a particular version of a common language runtime implementation.
namespace NUnit.Framework.Internal { public sealed class RuntimeFramework { public static readonly Version DefaultVersion; public static RuntimeFramework CurrentFramework { get; } public RuntimeType Runtime { get; } public Version FrameworkVersion { get; } public Version ClrVersion { get; } public bool AllowAnyVersion { get; } public string DisplayName { get; } public RuntimeFramework(RuntimeType runtime, Version version); public static RuntimeFramework Parse(string s); public bool Supports(RuntimeFramework target); } }