For example, as @Boris Pavlović notes in his answer, if the singleton's behaviour is based on the system time, your tests escort passport 8500x50 ru are now also dependent on the system time, and you may not be able to test cases that, say, depend on the day.
Public class MyClass private SomeInterface balmain brothel _s ; public MyClass( SomeInterface s ) _s s ;.
MyClass may now be very difficult to automatedly test.
The Singleton of Dufftown 18 Years Old.That still works out the same at run-time, but for testing you are now again dependent on SomeSingleton.Bill Pugh initialization on Demand Holder ).Enter(s_lock Singleton temp new Singleton Interlocked.OkHttpClient, Retrofit, Gson, SharedPreferences.Null) return instance; Monitor.However, if your singleton "implements an interface that serves as its type" then you can still use a singleton implementation of that interface, so long as you pass it in: public class SomeSingleton implements SomeInterface.For example, singletons are typically instantiated directly like this: public class MyClass private MySingleton _s tInstance ;.Unless, that is, you (1) make the singleton implement an interface, and (2) inject the singleton to your class using that interface.The Singleton of Dufftown 15 Years Old.Exchange(ref instance, temp Monitor.
The problem isn't testing singletons themselves; the book is saying that if a class you are trying to test depends on a singleton, then you will likely have we re all prostitutes problems.
MyClass m new MyClass( tInstance ) ; From the perspective of testing MyClass you now don't care if SomeSingleton is singleton or not: you can also pass in any other implementation you want, including the singleton implementation, but most likely you'll use a mock.
BTW, this is NOT the way to do it: public class MyClass private SomeInterface _s tInstance ; public MyClass.
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