Behave BDD Skill

Description

--- name: behave-skill 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". languages: - Python category: bdd-testing license: MIT metadata: author: TestMu AI version: "1.0" --- # Behave BDD Skill ## Core Patterns ### Feature File (features/login.feature) ```gherkin 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 "[email protected]" 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 "[email protected]" 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 | | [email protected] | admin123 | Dashboard | | [email protected] | wrong | Error | ``` ### Step Definitions (features/steps/login_steps.py) ```python 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) ```python 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 ```gherkin @smoke Feature: Login @critical Scenario: ... ``` ```bash 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` ```python # 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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