Unit tests for constructions using alerts

Question

I am having difficulty testing some logic that uses notifications. I read about on the condition that this one is sentNSNotifications , but this is actually not the problem that I see.

[SomeObject PerformAsyncOperation]Creates NSURLRequestand sets itself up as a delegate to the response. Depending on the content of the response, SomeObjectpublishes successful or unsuccessful NSNotificationby default NSNotificationCenter.

The problem with my test is that after the call, the PerformAsyncOperationtest does not wait for the response to be sent. Instead, it continues with a statement that fails because the request / response did not manage to send / receive / analyze.

Here is the code:

-(void)testMethod {
    SomeObject *x = [[SomeObject alloc] init];

    [[NSNotificationCenter defaultCenter] addObserver:self
                                        selector:@selector(success:)
                                            name:SomeObjectSuccess
                                          object:nil];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                        selector:@selector(failure:)
                                            name:SomeObjectFailure
                                          object:nil];

    operationCompleted = false; // declared in .h

    [x PerformAsyncOperation:@"parameter"];

    STAssertTrue(operationCompleted , @"Operation has completed.");

    [[NSNotificationCenter defaultCenter] removeObserver:self name:SomeObjectSuccess object:nil];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:SomeObjectFailure object:nil];

    [x release];
}

-(void) failure:(NSNotification *) notification {
   operationCompleted = true;
   NSLog(@"Received failure message.");
}

-(void) success:(NSNotification *) notification {
   operationCompleted = true;
   NSLog(@"Received success message.");
}

PerformAsyncOperation, while (!operationCompleted). - - , while . success: failure:, OCUnit , , ( NSURLRequest, !).

. !

Answer 1

, , - , . , . , .

NSTimeInterval timeout = 2.0;   // Number of seconds before giving up
NSTimeInterval idle = 0.01;     // Number of seconds to pause within loop
BOOL timedOut = NO;

NSDate *timeoutDate = [[NSDate alloc] initWithTimeIntervalSinceNow:timeout];
while (!timedOut && !operationCompleted)
{
    NSDate *tick = [[NSDate alloc] initWithTimeIntervalSinceNow:idle];
    [[NSRunLoop currentRunLoop] runUntilDate:tick];
    timedOut = ([tick compare:timeoutDate] == NSOrderedDescending);
    [tick release];
}
[timeoutDate release];

, , , .

Answer 2

.

- (void)testExample
{
    [self measureBlock:^{

        NSURLRequest *request = [[NSURLRequest alloc] initWith...];

        NSHTTPURLResponse *response = nil;
        NSData *data = [NSURLConnection sendSynchronousRequest:request
                                         returningResponse:&response
                                                     error:nil];

        XCTAssertEqual(response.statusCode,200);

        // process the data from response ... call the delegate methods or whatever

        NSObject *object = [NSJSONSerialization JSONObjectWithData:data
                                                       options:NSJSONReadingMutableContainers
                                                         error:nil];
        XCTAssertTrue([object isKindOfClass:[NSArray class]]);
    }];
}