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Junit tests: test void methods

Junit tests: test void methods

(OP)
Hello,

I have a question, how can I test a void method? This method does not return anything and it changes some objects inside itself(I mean that object is inside the method and I can not observe the state of this object outside of the method...)... Co I don't have any idea how to test it. I only know how to test method, which returns smth... :(. Please help.
For example:
Class A{
..
 void SomeMethod(
 some object...
)
}

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