Advanced Playwright TypeScript Tutorial | Code Generation | Part II | LambdaTest

From The House of LambdaTest LambdaTest Tutorials
1

:rocket: Hello folks! :rocket: Want to level up your testing game? :dart:

In our latest video, we dive deep into Playwright’s code generation! Learn how to:

:white_check_mark: Generate code with ease

:white_check_mark: Unlock powerful benefits

:white_check_mark: Avoid common pitfalls

:white_check_mark: Master usage for maximum efficiency

Watch now and start optimizing your testing workflow today! :desktop_computer::fire:

2

This tutorial is fantastic—really helps dive deeper into Playwright and TypeScript!

I’d also like to add a tip for Recording and Customizing Playwright Scripts:

Playwright offers a powerful code generation tool to record user interactions and create TypeScript scripts.

Here’s how to get started:

1. Use the Playwright CLI:

npx playwright codegen

2. Perform the desired actions in the browser while it records.

3. Save the generated script as a .ts file and customize it further with advanced features:

await expect(page.locator('selector')).toHaveText('Expected Text');

  • Add assertions:

await expect(page.locator('selector')).toHaveText('Expected Text');

  • Use custom helper functions for cleaner, reusable code snippets.

Finally, integrate the customized script into a test runner like Jest or Playwright Test to streamline your workflow.

Looking forward to more tutorials like this—great stuff for mastering Playwright!

3

This is such an insightful thread!

For larger projects, you can streamline your workflow by creating code templates to dynamically generate Playwright scripts based on input parameters.

Here’s how:

  1. Define a TypeScript code template as a string:
const template = `
import { test, expect } from '@playwright/test';

test('Dynamic Test - ${testName}', async ({ page }) => {
  await page.goto('${url}');
  // Add actions dynamically
  ${actions.join('\n')}
});
`;

2. Replace placeholders (${testName}, ${url}, ${actions}) with the required data dynamically.

3. Save the script programmatically** using Node.js:

const fs = require('fs');
fs.writeFileSync('tests/generatedTest.ts', template);

This approach is incredibly helpful when scaling test automation, especially when handling repetitive or parameterized test cases. It ensures consistency and saves time!

4

Advanced Script Generation with Custom Playwright Plugins

Leverage Playwright’s API and custom plugins to generate scripts programmatically:

  • Create a Playwright plugin to intercept and log actions:
class ScriptLogger {
  constructor() {
    this.logs = [];
  }
  logAction(action: string) {
    this.logs.push(action);
  }
  generateScript() {
    return this.logs.join('\n');
  }
}
  • Integrate it with Playwright:
const logger = new ScriptLogger();
page.on('request', (req) => logger.logAction(`await page.goto('${req.url()}');`));
// Add more event listeners for clicks, inputs, etc.

Export the script to a TypeScript file and refine it for advanced scenarios.