Cocoa TDD 和单例
我正在使用 Cocoa 进行 TDD，我想问 - 测试单例类的正确方法是什么？我对初始化和检索部分很好奇。
我正在考虑做类似的事情：
MySingleton *singleton1 = [MySingleton sharedInstance];
MySingleton *singleton2 = [[MySingleton alloc] init];
STAssertEqualObjects(singleton1, singleton2, @"Objects were not equal: %@ and %@", singleton1, singleton2);
我还应该测试什么？我是否应该尝试在可能的竞争条件下测试行为（测试 @synchronize 语句）？
I'm doing TDD with Cocoa and I wanted to ask - what is the correct way of testing a singleton class? I'm curious about the initialization and retrieval part.
I'm thinking of doing something similar to this:
MySingleton *singleton1 = [MySingleton sharedInstance];
MySingleton *singleton2 = [[MySingleton alloc] init];
STAssertEqualObjects(singleton1, singleton2, @"Objects were not equal: %@ and %@", singleton1, singleton2);
Anything else I should test for? Should I even try to test the behavior under possible race conditions (test the @synchronize statement)?
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如果您的单例没有可写状态，那么您根本不必担心这一点。
如果您的单例具有可写状态，那么它可能根本不应该是单例。
If your singleton has no writable state, then you don't have to worry about this at all.
If your singleton has writable state, then it probably shouldn't be a singleton at all.