CanBeFinalized on Mono.cs

using System;
using Xunit;

namespace ConsoleApp7
{
    public class FinalizerTest
    {
        static void AllocAndLeaveScope()
        {
            new TestClass();
        }

        [Fact]
        public void CanBeFinalized()
        {
            AllocAndLeaveScope();
            GC.Collect();
            GC.WaitForPendingFinalizers();

            if (!TestClass.isFinalized)
                throw new InvalidOperationException();
        }
    }

    public class TestClass
    {
        public static bool isFinalized;

        ~TestClass()
        {
            isFinalized = true;
        }
    }
}