
Skill
behave-skill
generate Behave BDD tests in Python
Description
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.md
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 |
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