parse.m

+(NSDictionary*)parse:(NSDictionary*)dc{
    
    NSMutableDictionary *mutDc = [NSMutableDictionary dictionaryWithDictionary:dc];
    for(NSString *key in mutDc.allKeys){
        NSString *value = [mutDc objectForKey:key];
        if([value isEqualToString:@"true"])
            [mutDc setObject:@YES forKey:key];
        else  if([value isEqualToString:@"false"])
            [mutDc setObject:@NO forKey:key];
    }
    
    return (NSDictionary*)mutDc;
}

parseSpec.m

    it(@"should parse bool strings", ^{
        NSDictionary *dc = @{
                             @"first":@"true",
                             @"second":@"false",
                             @"third":@"anotherThing"
                             };
        NSDictionary *expec = [IPFValidator parse:dc];
        
        expect(expec[@"first"]).to.beTruthy();
        expect(expec[@"second"]).to.beFalsy();
        
    });