How to mock a private field

Hey guys,

Say I have this piece of code ( class "AnExample"):

  public class AnExample

    {

        private string SomePrivateField;

        private int SomeOtherPrivateField= 0;

 public ClassUnderTest()

        {

            SomePrivateField = "Blablabla";

        }

}

I want to fake the instance of "SomePrivateField" and make it return "Hello!" rather than "Blablabla". How do I do it?

When I try with Isolate.Fake.Instance<AnExample> the test fails with the message that the actual output is "Blablabla" and not "Hello!". Any insights?