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behave is behavior-driven development, Python style.
|logo|
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 "features/". In that directory create a file called "example.feature" containing:
.. code-block:: gherkin
# -- FILE: features/example.feature
Feature: Showing off behave
Scenario: Run a simple test
Given we have behave installed
When we implement 5 tests
Then behave will test them for us!
Make a new directory called "features/steps/". In that directory create a file called "example_steps.py" containing:
.. code-block:: python
# -- FILE: features/steps/example_steps.py
from behave import given, when, then, step
@given('we have behave installed')
def step_impl(context):
pass
@when('we implement {number:d} tests')
def step_impl(context, number): # -- NOTE: number is converted into integer
assert number > 1 or number == 0
context.tests_count = number
@then('behave will test them for us!')
def step_impl(context):
assert context.failed is False
assert context.tests_count >= 0
Run behave:
.. code-block:: console
$ behave
Feature: Showing off behave # features/example.feature:2
Scenario: Run a simple test # features/example.feature:4
Given we have behave installed # features/steps/example_steps.py:4
When we implement 5 tests # features/steps/example_steps.py:8
Then behave will test them for us! # features/steps/example_steps.py:13
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 get the most out of behave. To get started,
we recommend the tutorial
_ and then the feature testing language
_ and
api
_ references.
.. _Install *behave*.
: https://behave.readthedocs.io/en/stable/install.html
.. _tutorial
: https://behave.readthedocs.io/en/stable/tutorial.html#features
.. _feature testing language
: https://behave.readthedocs.io/en/stable/gherkin.html
.. _api
: https://behave.readthedocs.io/en/stable/api.html
behave documentation
: latest edition
, stable edition
, PDF
behave.example
_: Behave Examples and Tutorials (docs, executable examples).changelog
_ (latest changes).. _behave documentation: https://behave.readthedocs.io/ .. _changelog: https://github.com/behave/behave/blob/main/CHANGES.rst .. _behave.example: https://github.com/behave/behave.example
.. _latest edition
: https://behave.readthedocs.io/en/latest/
.. _stable edition
: https://behave.readthedocs.io/en/stable/
.. _PDF: https://behave.readthedocs.io/_/downloads/en/stable/pdf/