OCHamcrest RespondsTo matcher: assertThat(anObject, respondsTo(@"someMethod:")); Instead of something like: assertTrue([anObject respondsToSelector:@selector(someMethod:)]);

PKRespondsToMatcher.h

//
//  PKRespondsToMatcher.h
//
//  Created by Pavel Kunc on 11/02/2011.
//  Copyright 2011 Pavel Kunc. All rights reserved.
//

#import <OCHamcrestIOS/HCBaseMatcher.h>
#import <OCHamcrestIOS/HCDescription.h>
#import <objc/objc-api.h>

@interface PKRespondsToMatcher : HCBaseMatcher {
    NSString *selectorString_;
}

+ (NXRRespondsToMatcher *)respondsToMatcher:(NSString *)aSelectorString;
- (id)initWithString:(NSString *)aSelectorString;
@end

OBJC_EXPORT id<HCMatcher> PK_respondsTo(NSString *aString);

#ifdef HC_SHORTHAND
#define respondsTo PK_respondsTo
#endif

PKRespondsToMatcher.m

//
//  PKRespondsToMatcher.m
//
//  Created by Pavel Kunc on 11/02/2011.
//  Copyright 2011 Pavel Kunc. All rights reserved.
//
#import "PKRespondsToMatcher.h"

@implementation PKRespondsToMatcher

+ (PKRespondsToMatcher *)respondsToMatcher:(NSString *)aSelectorString {
    return [[[self alloc] initWithString:aSelectorString] autorelease];
}

- (id) initWithString:(NSString *)aSelectorString {
    if ((self = [super init])) {
        selectorString_ = [aSelectorString copy];
    }
    return self;
}

- (void)dealloc {
    [selectorString_ release];
    [super dealloc];
}

- (BOOL) matches:(id)item {
    return [item respondsToSelector:NSSelectorFromString(selectorString_)];
}

- (void) describeMismatchOf:(id)item to:(id<HCDescription>)mismatchDescription {
    [mismatchDescription appendText:@"it doesn't."];
}

- (void)describeTo:(id<HCDescription>)description {
    [[description appendText:@"respond to "] appendValue:selectorString_];
}

@end

id<HCMatcher> PK_respondsTo(NSString *aString) {
    return [PKRespondsToMatcher respondsToMatcher:aString];
}