Plumber fails to leave trash

gistfile1.cs

public class when_a_plumber_fixes_a_sink
{
    static Plumber _plumber;
    static Sink _sink;

    Establish context = () =>
        {
            _plumber = new Plumber();
            _sink = new Sink
                {
                    Leaks = new List<Leak>
                        {
                            new Leak(),
                            new Leak()
                        },
                    Floor = new Floor
                        {
                            Trash = new List<Trash>()
                        }
                };
        };

    Because of = () => _plumber.FixSink(_sink);

    It should_ensure_that_the_pipes_do_not_leak = () => _sink.Leaks.ShouldBeEmpty();

    It should_reveal_his_crack = () => _plumber.CrackShowing.ShouldBeTrue();

    It should_leave_trash_on_the_floor = () => _sink.Floor.Trash.ShouldNotBeEmpty();
}