iPHone: Unit/Logic Tests initWithNibName

Question

I have setup my Logic Tests following the instructions on http://developer.apple.com/iphone/library/documentation/Xcode/Conceptual/iphone_development/135-Unit_Testing_Applications/unit_testing_applications.html.

I could test a couple classes successfully.

But I got error when testing the following:

- (id)init {
 if (self = [super initWithNibName:@"Foo" bundle:nil]) {
           ...
 }

 return self;

}

The error message is

-[UIViewController _loadViewFromNibNamed:bundle:] was unable to load a nib named "Foo"

My question:

1. Did I do something wrong? Missed something? or
2. I cannot test -initWithNibName using Logic Tests technique.

Thanks in advance for your help.