Playwright Testing

Exhibitor allows you to end-to-end (e2e) test your components with Playwright.

Playwright is a tool that lets you write e2e tests that use your component like a user would. You may have heard of or used similar tools like cypress or selenium.

Note that Playwright testing is a beta feature and is under active development.

Setup

Install the required Playwright packages within your component library package:
```
npm i --save-dev playwright-core @playwright/test
```

Declaring Tests

Create a .spec.ts file for your component. For example:

// button.spec.ts

import { test, expect } from '@playwright/test'
import { preparePlaywrightTest } from 'exhibitor'

test('has title (should pass)', async ({ page }) => {
  // This ensures that the browser page shows the correct component
  await preparePlaywrightTest(page)
  // Find the component
  const buttonEl = await page.$('.cl-button')
  // Measure a value/behavoir
  const buttonTextContent = await buttonEl.textContent()
  // Assert measured value/behavoir is correct
  await expect(buttonTextContent).toBe('Button Text')
})

Reference your .spec.ts file within your component exhibit:
```
exhibit(Button, 'Button')
  .tests('./button.spec.ts')
```

Running Tests

Once tests have been defined for your component, start Exhibitor if not already by running npx exhibitor start (or your script for doing so). Once Exhibitor has started, navigate to the component you would like to test and click the button in the bottom bar and click the run button: