behave is behaviour-driven development, Python style.

Behavior-driven development (or BDD) is an agile software development technique that encourages collaboration between developers, QA and non-technical or business participants in a software project.

behave uses tests written in a natural language style, backed up by Python code.

First, install *behave*.

Now make a directory called "example". In that directory create a file called "example.feature" containing:

Feature: showing off behave

  Scenario: run a simple test
     Given we have behave installed
      when we implement a test
      then behave will test it for us!

Make a new directory called "example/steps". In that directory create a file called "example.py" containing:

from behave import *

@given('we have behave installed')
def impl(context):
    pass

@when('we implement a test')
def impl(context):
    assert True is not False

@then('behave will test it for us!')
def impl(context):
    assert context.failed is False

Run behave:

% behave
Feature: showin off behave # example/example.feature:1

  Scenario: run a simple test        # example/example.feature:3
    Given we have behave installed   # example/steps/example.py:3
    When we implement a test         # example/steps/example.py:7
    Then behave will test it for us! # example/steps/example.py:11

1 feature passed, 0 failed, 0 skipped
1 scenario passed, 0 failed, 0 skipped
3 steps passed, 0 failed, 0 skipped, 0 undefined

Now, continue reading to learn how to the most of behave. To get started, we recommend the tutorial and then the feature testing language and api references.

• behave.example: Behave Examples and Tutorials (docs, executable examples).

Behave and other BDD frameworks allow you to provide step libraries to reuse step definitions in similar projects that address the same problem domain.

Support of the following testing domains is currently known: