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python-guide/docs/scenarios/ci.rst
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Continuous Integration
======================
Why?
----
Martin Fowler, who first wrote about `Continuous Integration <http://martinfowler.com/articles/continuousIntegration.html>`_
(short: CI) together with Kent Beck, describes the CI as follows:
Continuous Integration is a software development practice where members of
a team integrate their work frequently, usually each person integrates at
least daily - leading to multiple integrations per day. Each integration is
verified by an automated build (including test) to detect integration errors
as quickly as possible. Many teams find that this approach leads to
significantly reduced integration problems and allows a team to develop
cohesive software more rapidly.
Jenkins
-------
`Jenkins CI <http://jenkins-ci.org>`_ is an extensible continuous integration
engine. Use it.
Buildbot
--------
`Buildbot <http://docs.buildbot.net/current/>`_ is a Python system to
automate the compile/test cycle to validate code changes.
Mule
-----
`Mule <http://www.mulesoft.org/documentation/display/current/Mule+Fundamentals>`_
is a lightweight integration platform that enables you to connect anything,
anywhere. You can use Mule to intelligently manage message routing, data
mapping, orchestration, reliability, security and scalability between nodes.
Plug other systems and applications into Mule and let it handle all the
communication between systems, enabling you to track and monitor everything
that happens.
Tox
---
`tox <http://tox.readthedocs.org/en/latest/>`_ is an automation tool providing
packaging, testing and deployment of Python software right from the console or
CI server. It is a generic virtualenv management and test command line tool
which provides the following features:
* Checking that packages install correctly with different Python versions and
interpreters
* Running tests in each of the environments, configuring your test tool of
choice
* Acting as a front-end to Continuous Integration servers, reducing boilerplate
and merging CI and shell-based testing.
Travis-CI
---------
`Travis-CI <https://travis-ci.org/>`_ is a distributed CI server which builds
tests for open source projects for free. It provides multiple workers to run
Python tests on and seamlessly integrates with GitHub. You can even have it
comment on your Pull Requests whether this particular changeset breaks the
build or not. So if you are hosting your code on GitHub, travis-ci is a great
and easy way to get started with Continuous Integration.
In order to get started, add a :file:`.travis.yml` file to your repository with
this example content::
language: python
python:
- "2.6"
- "2.7"
- "3.2"
- "3.3"
# command to install dependencies
script: python tests/test_all_of_the_units.py
branches:
only:
- master
This will get your project tested on all the listed Python versions by
running the given script, and will only build the master branch. There are a
lot more options you can enable, like notifications, before and after steps
and much more. The `travis-ci docs <http://about.travis-ci.org/docs/>`_
explain all of these options, and are very thorough.
In order to activate testing for your project, go to `the travis-ci site <https://travis-ci.org/>`_
and login with your GitHub account. Then activate your project in your
profile settings and you're ready to go. From now on, your project's tests
will be run on every push to GitHub.