如何使用XCTest＆amp; OCMock来测试返回块的方法？

Question

这是我的RegisterService.h

import "UserObject.h"

@interface RegisterService : NSObject

- (void)sharedInstance;

- (void)registerWithPhoneNum:(NSString *)phoneNum password:(NSString *)password result:(void (^)(UserObject *userObject))successBlock failure:(void (^)(NSNumber *statusCode, NSString *message))failureBlock;

那么如何使用XCTest＆amp; OCMock测试寄存器方法？谢谢！