调用[NSBundle mainBundle]时XCTest失败

问题描述

我有一些代码在某些时候调用 [NSBundle mainBundle] ，主要是读取/设置首选项。当我对方法进行单元测试时，测试失败，因为测试的mainBundle不包含该文件。

I have some code that calls [NSBundle mainBundle] at some point, mainly to read/set preferences. When I unit test the method, the test fails because the test's mainBundle does not contain the file.

这是，Apple将不会修复，因为他们认为它是：

This is a known issue, that Apple won't fix as they consider it is not a bug:

以前我们的代码库在<$ c $上使用类别覆盖c> NSBundle 的 + mainBundle 类方法来解决这个问题。但。

Previously our codebase was using a category override on NSBundle's +mainBundle class method to work around this. But this is dangerous because the behaviour of overriding an existing method in a category is undefined.

实际上Xcode警告关于它：

Actually Xcode warns you about it:

那么，解决这个问题的正确方法是什么？

So, what is the proper method to address the issue?

推荐答案

解决此问题的最简单，最简洁的方法是在单元测试中部分模拟NSBundle类以返回<$ c当你打电话给 [NSBundle mainBundle] 时，$ c> [NSBundle bundleForClass：[self class]] 。

The simplest and cleanest way of fixing this issue is to partially mock the NSBundle class in your unit tests to return [NSBundle bundleForClass:[self class]] when you call [NSBundle mainBundle].

您可以将它放在 -setup 方法中，以便为整个测试类进行模拟：

You may put this in your -setup method so that it is mocked for your entire test class:

static id _mockNSBundle;

@implementation MyTests

- (void)setUp
{
  [super setUp];

  _mockNSBundle = [OCMockObject niceMockForClass:[NSBundle class]];
  NSBundle *correctMainBundle = [NSBundle bundleForClass:self.class];
  [[[[_mockNSBundle stub] classMethod] andReturn:correctMainBundle] mainBundle];
}

@end

干净整洁。

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