playwright-bdd-configuration（Playwright BDD configuration 搜索）

Playwright BDD Configuration

Expert knowledge of Playwright BDD configuration, project setup, and integration with Playwright's testing framework for behavior-driven development.

Overview

Playwright BDD enables running Gherkin-syntax BDD tests with Playwright Test. Configuration is done through the playwright.config.ts file using the defineBddConfig() function, which generates Playwright test files from your .feature files.

Installation

# Install playwright-bdd
npm install -D playwright-bdd

# Or with specific Playwright version
npm install -D playwright-bdd @playwright/test

Basic Configuration

Minimal Setup

// playwright.config.ts
import { defineConfig } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const testDir = defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
});

export default defineConfig({
  testDir,
});

Generated Test Directory

The defineBddConfig() function returns a path to the generated test directory. By default, this is .features-gen in your project root:

const testDir = defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
});

// testDir = '.features-gen/features'

Custom Output Directory

const testDir = defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  outputDir: '.generated-tests', // Custom output directory
});

Configuration Options

Feature Files

Configure where to find feature files:

defineBddConfig({
  // Single pattern
  features: 'features/**/*.feature',

  // Multiple patterns
  features: [
    'features/**/*.feature',
    'specs/**/*.feature',
  ],

  // Exclude patterns
  features: {
    include: 'features/**/*.feature',
    exclude: 'features/**/skip-*.feature',
  },
});

Step Definitions

Configure step definition locations:

defineBddConfig({
  // Single pattern
  steps: 'steps/**/*.ts',

  // Multiple patterns
  steps: [
    'steps/**/*.ts',
    'features/**/*.steps.ts',
  ],

  // Mixed JavaScript and TypeScript
  steps: [
    'steps/**/*.ts',
    'steps/**/*.js',
  ],
});

Import Test Instance

When using custom fixtures, import the test instance:

defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  importTestFrom: 'steps/fixtures.ts', // Path to your custom test instance
});

The fixtures file should export the test instance:

// steps/fixtures.ts
import { test as base, createBdd } from 'playwright-bdd';

export const test = base.extend<{
  todoPage: TodoPage;
}>({
  todoPage: async ({ page }, use) => {
    const todoPage = new TodoPage(page);
    await use(todoPage);
  },
});

export const { Given, When, Then } = createBdd(test);

Advanced Configuration

Multiple Feature Sets

Configure different feature sets for different test projects:

import { defineConfig } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const coreTestDir = defineBddConfig({
  features: 'features/core/**/*.feature',
  steps: 'steps/core/**/*.ts',
  outputDir: '.features-gen/core',
});

const adminTestDir = defineBddConfig({
  features: 'features/admin/**/*.feature',
  steps: 'steps/admin/**/*.ts',
  outputDir: '.features-gen/admin',
});

export default defineConfig({
  projects: [
    {
      name: 'core',
      testDir: coreTestDir,
    },
    {
      name: 'admin',
      testDir: adminTestDir,
    },
  ],
});

Language Configuration

Configure the Gherkin language:

defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  language: 'de', // German keywords (Gegeben, Wenn, Dann)
});

Supported languages follow the Gherkin specification:

• en (English - default)
• de (German)
• fr (French)
• es (Spanish)
• ru (Russian)
• And many more...

Quote Style

Configure quote style in generated test files:

defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  quotes: 'single', // 'single' | 'double' | 'backtick'
});

Verbose Mode

Enable verbose output during generation:

defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  verbose: true,
});

Integration with Playwright Config

Full Configuration Example

// playwright.config.ts
import { defineConfig, devices } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const testDir = defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  importTestFrom: 'steps/fixtures.ts',
});

export default defineConfig({
  testDir,
  fullyParallel: true,
  forbidOnly: !!process.env.CI,
  retries: process.env.CI ? 2 : 0,
  workers: process.env.CI ? 1 : undefined,
  reporter: [
    ['html'],
    ['json', { outputFile: 'test-results/results.json' }],
  ],
  use: {
    baseURL: 'http://localhost:3000',
    trace: 'on-first-retry',
    screenshot: 'only-on-failure',
  },
  projects: [
    {
      name: 'chromium',
      use: { ...devices['Desktop Chrome'] },
    },
    {
      name: 'firefox',
      use: { ...devices['Desktop Firefox'] },
    },
    {
      name: 'webkit',
      use: { ...devices['Desktop Safari'] },
    },
  ],
  webServer: {
    command: 'npm run start',
    url: 'http://localhost:3000',
    reuseExistingServer: !process.env.CI,
  },
});

Environment-Specific Configuration

import { defineConfig } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const isCI = !!process.env.CI;

const testDir = defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  verbose: !isCI,
});

export default defineConfig({
  testDir,
  timeout: isCI ? 60000 : 30000,
  retries: isCI ? 2 : 0,
  workers: isCI ? 4 : undefined,
});

Running Tests

Generate and Run

# Generate test files from features
npx bddgen

# Run Playwright tests
npx playwright test

# Or combine both
npx bddgen && npx playwright test

Watch Mode

For development, regenerate on file changes:

# Watch feature and step files
npx bddgen --watch

# In another terminal, run tests
npx playwright test --watch

Export Step Definitions

Export all step definitions for documentation:

npx bddgen export

Directory Structure

Recommended project structure:

project/
├── playwright.config.ts
├── features/
│   ├── auth/
│   │   ├── login.feature
│   │   └── logout.feature
│   └── products/
│       └── catalog.feature
├── steps/
│   ├── auth/
│   │   ├── login.steps.ts
│   │   └── logout.steps.ts
│   ├── products/
│   │   └── catalog.steps.ts
│   └── fixtures.ts
└── .features-gen/          # Generated (gitignore this)
    └── features/
        ├── auth/
        │   ├── login.feature.spec.js
        │   └── logout.feature.spec.js
        └── products/
            └── catalog.feature.spec.js

Gitignore Generated Files

Add to .gitignore:

# Playwright BDD generated files
.features-gen/

Common Configuration Patterns

Monorepo Setup

// packages/e2e/playwright.config.ts
import { defineConfig } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const testDir = defineBddConfig({
  features: 'features/**/*.feature',
  steps: 'steps/**/*.ts',
  importTestFrom: 'steps/fixtures.ts',
});

export default defineConfig({
  testDir,
  use: {
    baseURL: process.env.BASE_URL || 'http://localhost:3000',
  },
});

Component Testing

import { defineConfig } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const testDir = defineBddConfig({
  features: 'features/components/**/*.feature',
  steps: 'steps/components/**/*.ts',
});

export default defineConfig({
  testDir,
  use: {
    ctPort: 3100,
  },
});

API Testing

import { defineConfig } from '@playwright/test';
import { defineBddConfig } from 'playwright-bdd';

const testDir = defineBddConfig({
  features: 'features/api/**/*.feature',
  steps: 'steps/api/**/*.ts',
});

export default defineConfig({
  testDir,
  use: {
    baseURL: 'https://api.example.com',
  },
});

Troubleshooting

Steps Not Found

If steps are not being matched:

1. Verify step patterns match your directory structure
2. Check for typos in step definition text
3. Ensure step files are included in the steps config
4. Run npx bddgen export to see all registered steps

Import Errors

If imports fail in generated files:

1. Verify importTestFrom path is correct
2. Ensure the file exports test and step functions
3. Check TypeScript configuration includes step files

Generation Errors

If bddgen fails:

1. Validate feature file syntax
2. Check for missing step definitions
3. Run with verbose: true for details
4. Verify all imports in step files

Best Practices

1. Organize by Feature - Group features and steps by domain
2. Use Fixtures - Share setup logic via Playwright fixtures
3. Keep Steps Simple - One action per step definition
4. Reuse Steps - Write generic steps that work across features
5. Version Generated Files - Optionally commit for debugging
6. CI Integration - Run bddgen before tests in CI
7. Type Safety - Use TypeScript for step definitions
8. Documentation - Export steps for team reference
9. Parallel Execution - Let Playwright handle parallelism
10. Clean Output - Gitignore generated directory

When to Use This Skill

• Setting up a new Playwright BDD project
• Configuring multiple feature sets
• Integrating custom fixtures with BDD
• Troubleshooting configuration issues
• Optimizing test generation
• Setting up monorepo testing
• Configuring language/i18n support