A design pattern is a general solution to a common problem. The singleton pattern is used to restricts the instantiation of a class to one single object.

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When you need to add a delay on your mock service response to simulate a long process or a timeout, you can easily do this by following the steps below.

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Probably all of us who works on daily basis with Linux servers faces this "problem": login with putty on remote server with user and password for one hundred time a day. A solution would be to save the username and the password, so one step to do the job. Of course this is not a secure way to do it, but is suitable for test servers and also from personal computers.

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