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Scale your testing with dynamic data and secure secrets management. Choose the right approach based on your testing needs.

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Environment Variables

Environment variables are ideal for configuration that changes between environments (dev, staging, production) or for secrets that shouldn’t be committed to code. Use this approach when you need to run the same tests against different servers or with different credentials. 
import { test } from 'vitest';
import { chrome } from 'testdriverai/presets';

test('multi-environment testing', async (context) => {
  const env = process.env.TEST_ENV || 'staging';
  const urls = {
    dev: 'https://dev.myapp.com',
    staging: 'https://staging.myapp.com',
    production: 'https://myapp.com'
  };

  const { testdriver } = await chrome(context, { 
    url: urls[env] 
  });

  await testdriver.assert('app is running');
});

# Run against different environments
TEST_ENV=dev npx vitest run
TEST_ENV=staging npx vitest run
TEST_ENV=production npx vitest run

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Test Fixtures

Test fixtures work best when you have structured, reusable test data that needs to be shared across multiple tests. Use fixtures when testing different user roles, product catalogs, or any scenario where you want to parameterize tests with a known set of data.
test/fixtures/users.js
export const testUsers = [
  { email: '[email protected]', role: 'admin' },
  { email: '[email protected]', role: 'user' },
  { email: '[email protected]', role: 'guest' }
];

export const products = [
  { name: 'Laptop', price: 999 },
  { name: 'Mouse', price: 29 },
  { name: 'Keyboard', price: 89 }
];
test/permissions.test.js
import { test } from 'vitest';
import { chrome } from 'testdriverai/presets';
import { testUsers } from './fixtures/users.js';

test.each(testUsers)('$role can access dashboard', async ({ email, role }, context) => {
  const { testdriver } = await chrome(context, { url });
  
  await testdriver.find('email input').type(email);
  await testdriver.find('password input').type('password123');
  await testdriver.find('login button').click();
  
  if (role === 'admin') {
    await testdriver.assert('admin panel is visible');
  } else {
    await testdriver.assert('user dashboard is visible');
  }
});

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Dynamic Data Generation

Dynamic data generation is perfect for creating unique test data on each run, avoiding conflicts with existing records, and testing edge cases with realistic data. Use libraries like Faker when you need fresh emails, names, or other data that won’t collide with previous test runs. 
import { test } from 'vitest';
import { chrome } from 'testdriverai/presets';
import { faker } from '@faker-js/faker';

test('user registration with dynamic data', async (context) => {
  const { testdriver } = await chrome(context, { url });

  // Generate unique test data for each run
  const userData = {
    firstName: faker.person.firstName(),
    lastName: faker.person.lastName(),
    email: faker.internet.email(),
    password: faker.internet.password({ length: 12 })
  };

  await testdriver.find('first name input').type(userData.firstName);
  await testdriver.find('last name input').type(userData.lastName);
  await testdriver.find('email input').type(userData.email);
  await testdriver.find('password input').type(userData.password);
  await testdriver.find('register button').click();

  await testdriver.assert('registration successful');
  console.log('Registered user:', userData.email);
});

npm install --save-dev @faker-js/faker