<PackageReference Include="NUnit" Version="3.11.0" />

Func<T1, T2, T3, T4, TResult>

public sealed delegate Func<T1, T2, T3, T4, TResult> : MulticastDelegate
namespace System { public delegate TResult Func<T1, T2, T3, T4, TResult> (T1 arg1, T2 arg2, T3 arg3, T4 arg4); }