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Getting Started

Running a Jest test

> yarn jest <path>

Debugging

Debugging Jest 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

Debugging Jest on Chrome DevTools

  1. Run Jest using Node with the V8 Inspector

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

    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:
    
    			--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]
    
    	-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]
  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