NodeJS : Uncaught Error: listen EADDRINUSE: address already in use :::3000 when mocha unit testing

NodeJS : Uncaught Error: listen EADDRINUSE: address already in use :::3000 when mocha unit testing
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NodeJS : Uncaught Error: listen EADDRINUSE: address already in use :::3000 when mocha unit testing
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when EADDRINUSE: Error: Uncaught unit : :::3000 mocha NodeJS testing in listen already use address