Selector not working for me

FROM : John James
DATE : Sun May 01 14:55:55 2005

I am probably doing some stupid newbie thing; please help.

i have a simple test case to try the selector feature. given the 
following  class definition and implementation:
--------------
#import <Cocoa/Cocoa.h>

@interface Seltest : NSObject
{}
    -(void)test1;
    -(void)test2:(NSString*)val;
@end

-----------
#import "seltest.h"

@implementation Seltest

-(void)test1
{NSLog(@"test1");}

-(void)test2:(NSString*)val
{NSLog(val);}

@end
-------------------

Elsewhere At runtime I try the following

    if ([Seltest respondsToSelector: @selector(test1:)]==YES)
        NSLog(@"YES");
    else
        NSLog(@"NO");

I always get NO!
Shouldn't it be YES?
Thanks for your help