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I recommend that you remove the static id field from Message and make it a non-static member of the MessageFactory. Then just add the current_id as argument of the Message constructor. This way, you avoid a global state and simplify unit testing.
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I recommend that you remove the static
idfield fromMessageand make it a non-static member of theMessageFactory. Then just add thecurrent_idas argument of theMessageconstructor. This way, you avoid a global state and simplify unit testing.