Component Testing with Playwright

 🧩 Component Testing with Playwright

Playwright is commonly used for end-to-end (E2E) testing, but it also supports component testing — particularly useful when working with front-end frameworks like React, Vue, and Svelte.


Component testing allows you to test individual UI components in isolation, making it easier to catch bugs early during development.


✅ Prerequisites

Before you start, make sure you have:


Node.js installed


A front-end framework (e.g., React, Vue, or Svelte)


Playwright installed with component testing support


⚙️ Step 1: Install Playwright with Component Testing

Run the following command:


bash

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Edit

npm create playwright@latest

During setup, choose:


Component testing


Your framework (React, Vue, etc.)


The browser(s) you want to use (Chromium, Firefox, WebKit)


Alternatively, install manually:


bash

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npm install -D @playwright/experimental-ct-react

# Or use @playwright/experimental-ct-vue for Vue

🧾 Step 2: Create a Component to Test

Here’s an example React component:


jsx

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// Button.jsx

export function Button({ label }) {

  return <button>{label}</button>;

}

🧪 Step 3: Write a Component Test

Create a test file (e.g., Button.spec.tsx):


tsx

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import { test, expect } from '@playwright/experimental-ct-react';

import { Button } from './Button';


test('should render the button with correct label', async ({ mount }) => {

  const component = await mount(<Button label="Click Me" />);

  

  await expect(component).toContainText('Click Me');

});

This test mounts the Button component and verifies the text content.


🚀 Step 4: Run the Tests

Start the component test runner:


bash

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npx playwright test --project=react

Or open the UI mode for easier debugging:


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npx playwright test --ui

🧩 Component Testing vs E2E Testing

Feature Component Testing E2E Testing

Scope One component Full application

Speed Fast Slower

Debugging Easier (fewer variables) Harder (more moving parts)

Use case Unit/UI testing Full user journeys


✅ Advantages of Component Testing in Playwright

Fast feedback: Faster than full E2E tests


Isolated: Test just the component, not the whole app


Real browsers: Tests run in actual browsers, not just simulated environments

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Accessibility Testing with Playwright

Multi-Tab Testing in Playwright

Testing Shadow DOM Elements with Playwright

Writing Custom Reporters in Playwright

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