Pipe extension in C#

PipeExtensions.cs

public static class PipeExtensions
{
    public static TOut Then< TIn, TOut >(this TIn item, Func< TIn, TOut > fn)
    {
        return fn(item);
    }
}

public class PipeTest
{
    [Fact]
    public void ShouldPipeItemToFunction()
    {
        "-2"
            .Then(int.Parse)
            .Then(Math.Abs)
            .Then(i => i + 2)
            .Should().Be(4);
    }
}