Test Unit Using Kiwi TDD Framework.

Have been struggling with writing a test unit for a method:

- (id<ISFModalMessageView>)modalMessageWithError:(NSError *)error
                           recoveryAttempter:(SFErrorRecoveryAttempter)attempter
{
if ([self shouldNotifyUserForError:error] && [self typeForError:error] == SFErrorTypeAlert) {
    NSString *title = [self titleForError:error];
    NSString *message = [self messageForError:error];
    SFAlertMessageView *alert = [[SFAlertMessageView alloc] initWithTitle:title
                                                                  message:message
                                                                    image:nil
                                                             cancelButton:@"Cancel"];

    SFErrorRecoveryOption option = [self recoveryOptionForError:error];
    if (option != SFErrorRecoveryOptionUndefiend) {
        NSString *optionTitle = [self titleForRecoveryOptionOfError:error];
        SFModalMessageAction optionAction = nil;
        if (attempter) {
            optionAction = attempter(option);

        }
        if (optionTitle.notEmpty && optionAction) {
            [alert addActionButtonWithTitle:optionTitle action:optionAction];
        } else {
#ifdef DEBUG
            NSAssert(false, @"Recovery option %ld isn't handled for error %@", option, error.localizedDescription);
#endif
            DDLogError(@"Recovery option %ld isn't handled for error %@", option, error.localizedDescription);
        }
    }
    return alert;
}
return nil;
}

This method defines what button will be added to an SFAlertMessageView and what action should be taken.

The algorithm for writing a test unit while using Kiwi would be following:

// create necessary domain, code or userInfo for our error. 
ErrorCode someCode = something; // those declared as "typedef NS_ENUM" 
NSDictionary *someUserInfoDictionary = @ {
someKeyHere: someObjectHere
};

// create an error object. 
NSError *error = [NSError errorWithDomain:nil code:someCode userInfo:someUserInfoDictionary]; NSString

// create an attempter
??? 

// create necessary title, message, image for our alert: 
NSString *title = title; 
NSString *message = message; 

// create an alert (SFAlertMessageView) that we know we will get
SFAlertMessageView *alert = [[SFAlertMessageView alloc] initWithTittle:title message:message image:nil cancelButton:@"Cancel"]; 

// create an alert and give it the result of [errorUtility modalMessageWithError: error recoveryAttempter:attempter]; 
SFAlertMessageView *trueAlert = [errorUtility modalMessageWithError:error recoveryAttempter:attempter]; 

// equate both alerts. 
[[alert should] equal:trueAlert]];

SFErrorRecoveryAttempter (for attempter) is declared as following:

typedef SFModalMessageAction (^ SFErrorRecoveryAttempter)(SFErrorRecoveryOption option);

and SFModalMessageAction :

typedef void (^ SFModalMessageAction)();

@protocol ISFModalMessageView <NSObject>

- (instancetype)initWithTitle:(NSString *)title
                      message:(NSString *)message
                        image:(UIImage *)image
                 cancelButton:(NSString *)cancelTitle;
- (void)addActionButtonWithTitle:(NSString *)title action:(SFModalMessageAction)action;
- (void)show;
- (void)hide:(BOOL)animated completion:(void (^)(void))completion;

@end

SFErrorRecoveryOption:

typedef NS_ENUM(NSUInteger, SFErrorRecoveryOption) {
SFErrorRecoveryOptionUndefiend = 0,

    SFErrorRecoveryOptionTryAgain,
    SFErrorRecoveryOptionReport,
    SFErrorRecoveryOptionSignIn,
    SFErrorRecoveryOptionSignUp,
    SFErrorRecoveryOptionReset,
    SFErrorRecoveryOptionSignInFacebook,
};

If you need more information, just let me know.