Getting started 

Development dependencies 

Working on cryptography requires the installation of a small number of development dependencies in addition to the dependencies for Installation (including Rust ). These are handled by the use of nox , which can be installed with pip .

$ # Create a virtualenv and activate it
$ # Set up your cryptography build environment
$ pip install nox
$ nox -e local

OpenSSL on macOS 

You must have installed OpenSSL (via Homebrew , MacPorts ) before invoking nox or else pip will fail to compile.

Running tests 

cryptography unit tests are found in the tests/ directory and are designed to be run using pytest . nox automatically invokes pytest and other required checks for cryptography :

$ nox -e local

You can also specify a subset of tests to run as positional arguments:

$ # run the whole x509 testsuite, plus the fernet tests
$ nox -e local -- tests/x509/ tests/test_fernet.py

Read the Docs v: 42.0.7

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