You attach a graphical debugger (Node Inspector) to jester.
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Install Node Inspector somewhere. Doesn't matter where.
$ npm install node-inspector -
Start jester in debug mode.
$ node-debug node_modules/jester-tester/src/bin/jester-watch.js debugger listening on port 5858 -
Node Inspector opens http://127.0.0.1:8080/debug?ws=127.0.0.1:8080&port=5858 in a browser.
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Place your breakpoints and press the play button to start running jester.