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I have a standalone singleton which successfully passes the test. But with a group of tests this fails since once a singleton is defined it does not allow to reset the instance.
Any ideas about how to go about this?
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Well-designed singleton can have only one instance per application. Creating of multiple instances is a mistake in the application design. It might happen in some cases, e.g.: Non thread safe singleton with lazy initialization: several threads are trying to get an instance and creates multiple instances.
There are two types of singleton implementations: eager and lazy initialization.
It's very difficult to write unit tests for code that uses singletons because it is generally tightly coupled with the singleton instance, which makes it hard to control the creation of singleton or mock it.
I assume you have a private static field within your singleton class to store the initialized instance.
If you do not want to modify your code, you can define a teardown method which run after every test, and in this method you set this static field to null via reflection as seen here.
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