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Getting started
===============
Working on ``cryptography`` requires the installation of a small number of
development dependencies in addition to the depedencies for `installation`_.
These are listed in ``dev-requirements.txt`` and they can be installed in a
`virtualenv`_ using `pip`_. Once you've installed the dependencies, install
``cryptography`` in ``editable`` mode. For example:
.. code-block:: console
$ # Create a virtualenv and activate it
$ pip install --requirement dev-requirements.txt
$ pip install --editable .
You are now ready to run the tests and build the documentation.
Running tests
~~~~~~~~~~~~~
``cryptography`` unit tests are found in the ``tests/`` directory and are
designed to be run using `pytest`_. `pytest`_ will discover the tests
automatically, so all you have to do is:
.. code-block:: console
$ py.test
...
62746 passed in 220.43 seconds
This runs the tests with the default Python interpreter.
You can also verify that the tests pass on other supported Python interpreters.
For this we use `tox`_, which will automatically create a `virtualenv`_ for
each supported Python version and run the tests. For example:
.. code-block:: console
$ tox
...
ERROR: py26: InterpreterNotFound: python2.6
py27: commands succeeded
ERROR: pypy: InterpreterNotFound: pypy
ERROR: py32: InterpreterNotFound: python3.2
py33: commands succeeded
docs: commands succeeded
pep8: commands succeeded
You may not have all the required Python versions installed, in which case you
will see one or more ``InterpreterNotFound`` errors.
Explicit backend selection
~~~~~~~~~~~~~~~~~~~~~~~~~~
While testing you may want to run tests against a subset of the backends that
cryptography supports. Explicit backend selection can be done via the
``--backend`` flag. This flag should be passed to ``py.test`` with a comma
delimited list of backend names.
.. code-block:: console
$ tox -- --backend=openssl
$ py.test --backend=openssl,commoncrypto
Building documentation
~~~~~~~~~~~~~~~~~~~~~~
``cryptography`` documentation is stored in the ``docs/`` directory. It is
written in `reStructured Text`_ and rendered using `Sphinx`_.
Use `tox`_ to build the documentation. For example:
.. code-block:: console
$ tox -e docs
...
docs: commands succeeded
congratulations :)
The HTML documentation index can now be found at
``docs/_build/html/index.html``.
.. _`pytest`: https://pypi.python.org/pypi/pytest
.. _`tox`: https://pypi.python.org/pypi/tox
.. _`virtualenv`: https://pypi.python.org/pypi/virtualenv
.. _`pip`: https://pypi.python.org/pypi/pip
.. _`sphinx`: https://pypi.python.org/pypi/Sphinx
.. _`reStructured Text`: http://sphinx-doc.org/rest.html
.. _`installation`: https://cryptography.io/en/latest/installation/
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