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Getting Started

Running a Jest test

> yarn jest <path>

note: Breakpoints will not work in this mode. To debug, run the Jest test using a node server.

Running a Jest test on a node server and inspecting in VS Code

  1. Open VS Code

  2. Open the “Run and Debug” panel (⇧⌘D)

  3. Click the “JavaScript Debug Terminal” button to open the Terminal

  4. Run Jest using Node

    > yarn jest --watch <path>

Additional methods and information to debug in VS Code can be found here

Running a Jest test on a node server and inspecting in Chrome DevTools

  1. Run Jest using Node with the V8 Inspector

    > yarn test:unit:jest:watch <path>

    or

    > node --inspect ./node_modules/.bin/jest --watch <path>

    Useful options:

    node:

    --inspect=[host:]port
          Activate inspector on host:port.  Default is 127.0.0.1:9229.

          V8 Inspector integration allows attaching Chrome DevTools and IDEs
          to Node.js instances for debugging and profiling.  It uses the
          Chrome DevTools Protocol.

jest:

    -i, --runInBand
          Run all tests serially in the current
          process (rather than creating a worker pool
          of child processes that run tests). This is
          sometimes useful for debugging, but such use
          cases are pretty rare.             [boolean]

    -u, --updateSnapshot
          Use this flag to re-record snapshots. Can be
          used together with a test suite pattern or
          with `--testNamePattern` to re-record
          snapshot for test matching the pattern

    --watch
          Watch files for changes and rerun tests
          related to changed files. If you want to
          re-run all tests when a file has changed,
          use the `--watchAll` option.       [boolean]

    To view more options:

    > ./node_modules/.bin/jest help

  2. Open Chrome DevTools for Node

    1. Open a Chromium browser
    2. Go to chrome://inspect/#devices
    3. Click “Open dedicated DevTools for Node” link