A pattern for increasing the testability of `prepareForSegue:sender:`

gistfile1.m

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    DDLogVerbose(@"prepareForSegue: %@", segue.identifier);

    SEL selector = NSSelectorFromString([NSString stringWithFormat:@"%@ToController:WithSegue:", segue.identifier]);
    if ([self respondsToSelector:selector]) {
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
        [self performSelector:selector withObject:segue.destinationViewController withObject:segue];
#pragma clang diagnostic pop
    } else {
        NSException *ex = [NSException exceptionWithName:@"Segue Handler Selector Not Found" reason:[NSString stringWithFormat:@"There is no \"ToController\" selector to handle the segue: %@", segue.identifier] userInfo:@{ @"segue" : segue}];
        DDLogError(@"%@", ex);
        [ex raise];
    }
}

gistfile2.m

-(void)entityListSegueToController:(TNWEntityTableViewController *)controller WithSegue:(UIStoryboardSegue *)segue {
    DDLogVerbose(@"Segue to Entity List with Controller: %@ and segue: %@", controller, segue);

    [controller beginLoadEntity:self.selectedEntityList];
}