public void SetUp()
{
_context = MockRepository.GenerateMock<HttpContextBase>();
_mapper = new HttpContextBaseMapper();
Type type = typeof(When_mapping_parameter);
MethodInfo methodInfo = type.GetMethod("Method", BindingFlags.NonPublic | BindingFlags.Instance);
ParameterInfo parameterInfo = methodInfo.GetParameters()[0];
_result = _mapper.MapAsync(_context, type, methodInfo, parameterInfo).Result;
}