Agent Skill · LambdaTest
behave-skill
Generates Behave BDD tests for Python with Gherkin feature files and step implementations. Use when user mentions "Behave", "Python BDD", "Python Gherkin". Triggers on: "Behave", "Python BDD", "behave test", "Python feature file".
Skill body
Behave BDD Skill
Core Patterns
Feature File (features/login.feature)
Feature: User Login
As a registered user
I want to log into the application
Background:
Given I am on the login page
Scenario: Successful login
When I enter "user@test.com" as email
And I enter "password123" as password
And I click login
Then I should see the dashboard
And the welcome message should say "Welcome"
Scenario: Invalid credentials
When I enter "wrong@test.com" as email
And I enter "wrong" as password
And I click login
Then I should see error "Invalid credentials"
Scenario Outline: Login with various users
When I enter "<email>" as email
And I enter "<password>" as password
And I click login
Then I should see "<result>"
Examples:
| email | password | result |
| admin@test.com | admin123 | Dashboard |
| bad@test.com | wrong | Error |
Step Definitions (features/steps/login_steps.py)
from behave import given, when, then
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
@given('I am on the login page')
def step_on_login(context):
context.browser.get(context.base_url + '/login')
@when('I enter "{text}" as email')
def step_enter_email(context, text):
el = context.browser.find_element(By.ID, 'email')
el.clear()
el.send_keys(text)
@when('I enter "{text}" as password')
def step_enter_password(context, text):
el = context.browser.find_element(By.ID, 'password')
el.clear()
el.send_keys(text)
@when('I click login')
def step_click_login(context):
context.browser.find_element(By.CSS_SELECTOR, 'button[type="submit"]').click()
@then('I should see the dashboard')
def step_see_dashboard(context):
WebDriverWait(context.browser, 10).until(
EC.url_contains('/dashboard')
)
assert '/dashboard' in context.browser.current_url
@then('I should see error "{msg}"')
def step_see_error(context, msg):
error = WebDriverWait(context.browser, 5).until(
EC.visibility_of_element_located((By.CSS_SELECTOR, '.error'))
)
assert msg in error.text
Environment Hooks (features/environment.py)
from selenium import webdriver
def before_all(context):
context.base_url = 'http://localhost:3000'
def before_scenario(context, scenario):
context.browser = webdriver.Chrome()
context.browser.implicitly_wait(10)
def after_scenario(context, scenario):
if scenario.status == 'failed':
context.browser.save_screenshot(f'screenshots/{scenario.name}.png')
context.browser.quit()
Tags
@smoke
Feature: Login
@critical
Scenario: ...
behave --tags=@smoke
behave --tags="@smoke and not @slow"
Setup: pip install behave selenium
Run: behave or behave features/login.feature
Cloud Execution on TestMu AI
Set environment variables: LT_USERNAME, LT_ACCESS_KEY
# environment.py
from selenium import webdriver
import os
def before_scenario(context, scenario):
lt_options = {
"user": os.environ["LT_USERNAME"],
"accessKey": os.environ["LT_ACCESS_KEY"],
"build": "Behave Build",
"name": scenario.name,
"platformName": "Windows 11",
"video": True,
"console": True,
"network": True,
}
options = webdriver.ChromeOptions()
options.set_capability("LT:Options", lt_options)
context.driver = webdriver.Remote(
command_executor=f"https://{os.environ['LT_USERNAME']}:{os.environ['LT_ACCESS_KEY']}@hub.lambdatest.com/wd/hub",
options=options,
)
Report: behave --format json -o report.json
Deep Patterns
See reference/playbook.md for production-grade patterns:
| Section | What You Get |
|---|---|
| §1 Project Setup | behave.ini, project structure, dependencies |
| §2 Feature Files | Gherkin with Scenario Outline, data tables, Background |
| §3 Step Definitions | Type registration, API steps, common steps with PyHamcrest |
| §4 Environment Hooks | before_all/scenario/feature, screenshot on failure, DB isolation |
| §5 Page Objects | BasePage with waits, LoginPage, reusable components |
| §6 Fixtures & Test Data | DatabaseHelper, transaction rollback, JSON data loader |
| §7 LambdaTest Integration | Remote browser creation, cloud capabilities |
| §8 CI/CD Integration | GitHub Actions with Postgres, Selenium, Allure reports |
| §9 Debugging Table | 12 common problems with causes and fixes |
| §10 Best Practices | 14-item BDD testing checklist |
Skill frontmatter
languages: Python
category: bdd-testing
license: MIT
metadata: {"author" => "TestMu AI", "version" => "1.0"}
Work with this as data
Every skill here is available over the APIs.io API and to AI agents over MCP.