Web3 Provider for Playwright

What does this do?

Normally we get the ethereum provider from a wallet extension. Running tests in headless mode means we have no extensions installed => no ethereum provider. This script will inject a customized provider with a wallet that signs transactions automatically. It can:

• send transactions
• sign transactions
• request accounts
• contract calls

For now, it only works for Mumbai, but you can easily customize it to work with other chains by changing the rpc url and the chain id (0x13881).

How to setup?

1. Initialize a var called PRIVATE_KEY inside an .env file

2. Run npm run bundle to compile index.js with webpack

3. The result is bundle.

4. Open test.html and console log window.ethereum to test the code.

5. Copy this file in the project where you use Playwright. Usage:

   await page.addInitScript({ path: './bundle/734.provider.js' });
   await page.addInitScript({ path: './bundle/895.provider.js' });
   await page.addInitScript({ path: './bundle/provider.js' });

6. Test if it works: expect(await page.evaluate(() => window['ethereum'])).toBeTruthy();

7. You can mimic MetaMask or other wallets by changing the wallet field (isMetaMask, isCoinbaseWallet, etc.) from index.js.

Warning: The provider.js file will contain your private key.