isKindOfClass意外返回NO

问题描述

我的单元测试之一是失败，并且有一个原因我没有预料到。看来对 isKindOfClass 的调用返回NO，但是当我调试和逐步通过时，似乎没有理由。

代码是：

  if（[self.detailItem isKindOfClass：[MovieInfo class]]）{
 [self configureViewForMovie]; 
} 
  

我走过代码并执行了：

  po self.detailItem 
  

显示：

 （id）$ 1 = 0x0ea8f390< MovieInfo：0xea8f390> 
  

所以，我错了什么，为什么if语句在这种情况下返回false？

编辑：

这里是DetailItem的设置器：

   - （void）setDetailItem：（id）newDetailItem 
 {
 if（_detailItem！= newDetailItem）{
 NSLog（@％@ [newDetailItem class]）; 
 _detailItem = newDetailItem; 
 
 //更新视图。 
 [self configureView]; 
} 
 
 if（self.masterPopoverController！= nil）{
 [self.masterPopoverController dismissPopoverAnimated：YES]; 
} 
} 
  

这是来自主细节模板的模板代码。 p>

单元测试在setUp中创建MovieInfo：

  movie = [[ MovieInfo alloc] initWithMovieName：@MoviemovieID：1]; 
  

并在测试中设置

  controller.detailItem = movie; 
 

此外，我在 setDetailItem ：

  NSParameterAssert（[newDetailItem isKindOfClass：[MovieInfo class]] || [newDetailItem isKindOfClass：[PersonInfo class]] || newDetailItem == nil）; 
  

此断言也失败。

我在断言调用之上放了两个日志语句：

  NSLog（@％@，[newDetailItem class]） ; 
 NSLog（@％@，newDetailItem）; 
  

其中显示：

  2012-08-28 08：31：37.574 Popcorn [8006：c07] MovieInfo 
 2012-08-28 08：31：38.253 Popcorn [8006：c07]< MovieInfo：0x6daac50& 
  

更多编辑：

isKindOfClass 在单元测试中设置之前检查一次。

  if（[movie isKindOfClass：[MovieInfo class]]）{
 NSLog（@Yep）; //这传递并打印出
} 
 controller.detailItem = movie; //调用setter并失败。 
  

解决方案

这是由于测试类DetailViewController不在测试的目标。我会希望这表现在一个不同的方式（链接器错误或东西），但显然，它只是导致奇怪的行为。将DetailViewController添加到测试目标中解决了问题。

One of my unit tests is failing and for a reason I didn't anticipate. It seems a call to isKindOfClass is returning NO, but when I debug and step through, there seems to be no reason it would.

The code is:

if ([self.detailItem isKindOfClass:[MovieInfo class]]) {
    [self configureViewForMovie];
}

I stepped through the code and did:

po self.detailItem

which displays:

(id) $1 = 0x0ea8f390 <MovieInfo: 0xea8f390>

So, what am I missing, why would the if statement return false in this case?

EDIT:

Here is the setter for the DetailItem:

- (void)setDetailItem:(id)newDetailItem
{
    if (_detailItem != newDetailItem) {
        NSLog(@"%@", [newDetailItem class]);
        _detailItem = newDetailItem;

        // Update the view.
        [self configureView];
    }

    if (self.masterPopoverController != nil) {
        [self.masterPopoverController dismissPopoverAnimated:YES];
    }
}

It's template code from a Master Detail template.

The unit test creates a MovieInfo in setUp:

movie = [[MovieInfo alloc] initWithMovieName:@"Movie" movieID:1];

and sets it in the test

controller.detailItem = movie;

Additionally, I added a parameter assertion in setDetailItem:

NSParameterAssert([newDetailItem isKindOfClass:[MovieInfo class]] || [newDetailItem isKindOfClass:[PersonInfo class]] || newDetailItem == nil);

This assertion is failing as well.

I've put two log statements above the assertion call:

NSLog(@"%@", [newDetailItem class]);
NSLog(@"%@", newDetailItem);

which display:

2012-08-28 08:31:37.574 Popcorn[8006:c07] MovieInfo
2012-08-28 08:31:38.253 Popcorn[8006:c07] <MovieInfo: 0x6daac50>

ONE MORE EDIT:

I added the isKindOfClass check before setting it in the unit test, that one passes.

if ([movie isKindOfClass:[MovieInfo class]]) {
    NSLog(@"Yep"); //This passes and prints out
}
controller.detailItem = movie; //calls into the setter and fails.

解决方案

This was due to the fact that the class under test "DetailViewController" was not in the test's target. I would have expected this to manifest itself in a different way (linker error or something), but apparently, it just causes odd behavior. Adding DetailViewController to the test target fixed the issues.

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