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* docs: add tests/jest.md debugging guide * docs:jest.md: add basic test command * README.md: add docs/tests/jest.md link
67 lines
2.0 KiB
Markdown
67 lines
2.0 KiB
Markdown
# Getting Started
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## Running a Jest test
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```bash
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> yarn jest <path>
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```
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## Debugging
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### Debugging Jest in VS Code
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1. Open **VS Code**
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2. Open the “Run and Debug” panel (⇧⌘D)
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3. Click the “JavaScript Debug Terminal” button to open the Terminal
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4. Run Jest using Node
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```bash
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> yarn jest --watch <path>
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```
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Additional methods and information to debug in VS Code can be found [here](https://jestjs.io/docs/troubleshooting#debugging-in-vs-code)
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### Debugging Jest on Chrome DevTools
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1. Run Jest using Node with the V8 Inspector
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```bash
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> node --inspect ./node_modules/.bin/jest --watch -i <path>
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or
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> node --inspect ./node_modules/.bin/jest <path>
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```
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**Options:**
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```jsx
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node:
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--inspect=[host:]port
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Activate inspector on host:port. Default is 127.0.0.1:9229.
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V8 Inspector integration allows attaching Chrome DevTools and IDEs
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to Node.js instances for debugging and profiling. It uses the
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Chrome DevTools Protocol.
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jest:
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--watch Watch files for changes and rerun tests
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related to changed files. If you want to
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re-run all tests when a file has changed,
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use the `--watchAll` option. [boolean]
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-i, --runInBand Run all tests serially in the current
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process (rather than creating a worker pool
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of child processes that run tests). This is
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sometimes useful for debugging, but such use
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cases are pretty rare. [boolean]
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```
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1. Open Chrome DevTools for Node
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1. Open a **Chromium** browser
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2. Go to [chrome://inspect/#devices](chrome://inspect/#devices)
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3. Click “Open dedicated DevTools for Node” link
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