Async Unit Tests with Blocks - turns out, OCUnit doesn't provide a runLoop or anything like - so you gotta make your own

gistfile1.m

- (void)testFetchCrumbsForStartTime
{
    [NSRunLoop currentRunLoop];

    // use the downloader to "download" the data
    UMEPGQueryManager *queryMan = [[UMEPGQueryManager alloc] init];
    
    __block BOOL isDone = NO;

    //Makes calls to several blocks, on different threads
    [queryMan fetchChannelIdsWithCompletionHandler:^(NSArray *channelIds) {
        
        //Verify results here
        STAssertEquals(channelIds, verifiedChannelIds, @"your log message here");

        isDone = YES;
    }];
    
    while (!isDone) {
        [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1.0]];
    }
}