Python behave is a much widely used BDD framework these days. In this blog article, you will get to learn behave BDD framework’s features and how to use it to create automation test scripts. Behave is an open source tool which has 62 contributors who are actively developing new features and fixing the issues. Python Behave is a matured BDD framework.
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Feature Filesbehave is considered to be a clone of Cucumber BDD framework. Most of the features of behave is similar to Cucumber. However, there is a provision for additional flexibility in behave framework. Let’s have a look at them one by one. You can execute feature files in the following ways – by providing feature name, feature directory, at last without providing feature details. When you run behave command without feature path, it will search feature files in features directory by default.
FixturesFixtures aka Hooks are used to call Setup & Cleanup code before and after Test Run, Feature, Scenario, and Tag. You needn’t write a separate method for ‘After’ hooks. Both ‘Before’ and ‘After’ hooks can be implemented inside a single method. Let’s look at the below example.
@launch.browser Feature: Codoid Website Feature Scenario: Contact Codoid Team Given I am on home page When I submit contact us form Then I should see Thank You page with a message
from behave import fixture, use_fixture from selenium import webdriver @fixture def launch_browser(context, timeout=30, **kwargs): context.driver = webdriver.Chrome(executable_path='driverschromedriver.exe') yield context.driver context.driver.quit() def before_tag(context, tag): if tag == "launch.browser": the_fixture = use_fixture(launch_browser, context)
from behave import given, when, then from selenium import webdriver @given('I am on home page') def step_impl(context): context.driver.get("https://codoid.com") assert True is True
Executing Remaining Steps in a ScenarioBy default, scenario execution will be stopped if any of the steps is failed. However, you can override this in behave framework using Hooks and Command line.
from behave.model import Scenario def before_all(context): userdata = context.config.userdata continue_after_failed = userdata.getbool("runner.continue_after_failed_step", False) Scenario.continue_after_failed_step = continue_after_failed
behave -D runner.continue_after_failed_step=true features/
Filtering Scenarios and Examples using Tag Value You can select scenarios and examples using Tag and its value. This feature is helpful when you want to select an example based on the environment value for a tag.
Feature: Scenario Outline: Wow Given an employee "<name>" @use.with_stage=develop Examples: Araxas | name | birthyear | | Alice | 1985 | | Bob | 1975 | @use.with_stage=integration Examples: | name | birthyear | | Charly | 1995 |