Setup

We recommend using Jest but you're free to use the library with any testing framework and runner you're comfortable with.

Jest

Add the following to your package.json

{
  "scripts": {
    "test": "jest src",
    "test:watch": "npm run test -- --watch"
  }
}

You'll need to compile the Svelte components before using them in Jest, so we need to install svelte-jester
```
npm install --save-dev svelte-jester
```

Add the following Jest configuration to your package.json

{
  "jest": {
    "transform": {
      "^.+\\.svelte$": "svelte-jester"
    },
    "moduleFileExtensions": ["js", "svelte"]
  }
}

This is optional but it is recommended, you can install jest-dom to add handy assertions to Jest

5.1 Install jest-dom
```
npm install --save-dev @testing-library/jest-dom
```
5.2 Add the following to your Jest configuration in package.json
```
{
  "setupFilesAfterEnv": ["@testing-library/jest-dom/extend-expect"]
}
```
Create your component + test file (checkout the rest of the docs to see how) and run it
```
npm run test
```

To use Typescript, you'll need to install and configure svelte-preprocess and ts-jest. For full instructions, see the svelte-jester docs.

If you'd like to also include Babel or any Svelte preprocessors then simply follow the instructions over at svelte-jester.