Kiwi spying on multiple NSNotifications

Question

I am currently spying on postNotification like this

__block KWCaptureSpy *notificationSpy = [[NSNotificationCenter 
defaultCenter] captureArgument:@selector(postNotification:) atIndex:0];

The problem is I have multiple notifications with different notification names. How do I access the spy's argument for different notification.

For instance say I have Notification1 and Notification2 the spy argument captures Notification1 but I'm not able to capture the Notification2.

Any ideas of how this can be done?

I noticed you unacepted my answer, did something change and the answer no longer responds to the question? — Cristik, Jun 29 '17 at 09:43

score 1 · Accepted Answer · answered May 21 '15 at 07:38

Two approaches come into my mind:

stub the sendNotification: method, and build an array with the sent notifications:

NSMutableArray *sentNotifications = [NSMutableArray array];        
[[NSNotificationCenter defaultCenter] stub:@selector(postNotification:) withBlock:^id(NSArray *params) {
    NSNotification *notification = params[0];
    [sentNotifications addObject:notification.name];
    return nil;
}];
[[sentNotifications shouldEventually] equal:@[@"TestNotification1", @"TestNotification2"]];

if the notifications are not always sent in the same order, you might need another matcher then the equal: one.

write a custom matcher that registers as observer and evaluates when asked about the received notifications:

@interface MyNotificationMatcher : KWMatcher
- (void)sendNotificationNamed:(NSString*)notificationName;
- (void)sendNotificationsNamed:(NSArray*)notificationNames;
@end

which can be used in your tests like this:

[[[NSNotificationCenter defaultCenter] shouldEventually] sendNotificationsNamed:@[@"TestNotification1", @"TestNotification2"]];

As a side note, you don't need to decorate the notifications variable with __block, as you don't need to change the content of that variable (i.e. the pointer value).

score 0 · Answer 2 · answered May 20 '15 at 20:16

The solution I ended up using was

__block NSMutableArray *notifications = [[NSMutableArray alloc] init];
        [[NSNotificationCenter defaultCenter] stub:@selector(postNotification:) withBlock:^id(NSArray *params) {
            [notifications addObject:params[0]];
            return nil;
        }];

Kiwi spying on multiple NSNotifications

2 Answers2