text: #if DOTNET35
  namespace Rhino.Mocks.Tests.FieldsProblem
  {
  	using System;
  	using Xunit;
  
  	
  	public class FieldProblem_Henrik
  	{
  		[Fact]
  		public void Trying_to_mock_null_instance_should_fail_with_descriptive_error_message()
  		{
  			Assert.Throws<ArgumentNullException>("You cannot mock a null instance\r\nParameter name: mock", 
  				() => RhinoMocksExtensions.Expect<object>(null, x => x.ToString()));
  		}
  	}
  }
  #endif