使用 OCMock 来预期类别方法会产生“[NSProxy doesNotRecognizeSelector”...]”

Posted 2023-02-24

【中文标题】使用 OCMock 来预期类别方法会产生“[NSProxy doesNotRecognizeSelector”...]”

【英文标题】：Using OCMock to expect category methods yields "[NSProxy doesNotRecognizeSelector"...]"

【发布时间】：2009-10-31 10:03:57

【问题描述】：

我正在使用OCMock 尝试测试 NSURLConnection 的行为。这是不完整的测试：

#include "GTMSenTestCase.h"
#import <OCMock/OCMock.h>

@interface HttpTest : GTMTestCase

- (void)testShouldConnect;

@end

@implementation HttpTest

- (void)testShouldConnect 
  id mock = [OCMockObject mockForClass:[NSURLConnection class]];

  NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
  NSURLRequest *request = [NSURLRequest requestWithURL:url];
  NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:mock startImmediately:NO];

  [[mock expect] connection:connection didReceiveResponse:OCMOCK_ANY];


@end

当使用类别方法模拟类时，委托方法 connection:didReceiveresponse: 是，我收到错误：

Unknown.m:0:0 Unknown.m:0: error: -[HttpTest testShouldConnect] : *** -[NSProxy doesNotRecognizeSelector:connection:didReceiveResponse:] called!

有人遇到过这个问题吗？

【参考方案1】：

看起来你已经创建了一个 NSURLConnection 的模拟对象。但是，NSProxy 警告是正确的，NSURLConnection 对象没有选择器 connection:didReceiveResponse: - 这是一个传递给实现协议的对象的选择器。

你需要模拟一个实现 NSURLConnectionDelegate 的对象。由于委托协议指定 connection:didReceiveResponse: 你不应该得到一个错误:)

我对 OCMock 没有太多经验，但这似乎消除了编译错误：

@interface ConnectionDelegate : NSObject  
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response;
@end

@implementation ConnectionDelegate
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response  
@end



@interface ConnectionTestCase : SenTestCase  
@end

@implementation ConnectionTestCase

- (void)testShouldConnect 
 id mock = [OCMockObject mockForClass:[ConnectionDelegate class]];

 NSURL *url = [NSURL URLWithString:@"http://www.google.com"];
 NSURLRequest *request = [NSURLRequest requestWithURL:url];
 NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:mock startImmediately:NO];

 [[mock expect] connection:connection didReceiveResponse:OCMOCK_ANY];


@end

希望这会有所帮助，

山姆

【参考方案2】：

当使用 GCC 选项 COPY_PHASE_STRIP 设置为 YES 编译项目库时遇到此错误，因此符号不可见。然后针对该库运行测试，无法看到需要存根的方法设置 COPY_PHASE_STRIP=NO 修复了问题