This does not pass

[grzesiek-galezowski]

[Test]
public void ShouldHaveXMessageAsY()
{
XAssert.Equal("Session ID cannot be null.", SubscriptionValidationRules.SessionIdCannotBeNullMessage);

 var data = Any.Instance<SubscriptionRequestData>();

  var prevData = Clone.Of(data);

  Do(data);

  XAssert.Alike(prevData, data);
}

private void Do(SubscriptionRequestData data)
{
data.Duration = TimeSpan.FromDays(12334);
}