I'm finally making two-stage object creation work for me ;-)

gistfile1.m

#import <SenTestingKit/SenTestingKit.h>
#import "OCMock.h"

#import "NLPageControlScrollViewHelper.h"

#pragma mark - Tests

@interface NLPageControlScrollViewHelperTests : SenTestCase

@end

@implementation NLPageControlScrollViewHelperTests

- (void)testSetSelfAsScrollViewDelegate
{
    id mockScrollView = [OCMockObject niceMockForClass:[UIScrollView class]];
    // alloc
    NLPageControlScrollViewHelper *helper = [NLPageControlScrollViewHelper alloc];

    [[mockScrollView expect] setDelegate:helper];
    // then init
    helper = [helper initWithPageControl:nil scrollView:mockScrollView];

    [mockScrollView verify];
}

@end