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Contributing to Azure Python SDK

If you would like to become an active contributor to this project please follow the instructions provided in Microsoft Azure Projects Contribution Guidelines.

Building and Testing

The Azure SDK team's Python CI leverages the tool tox to distribute tests to virtual environments, handle test dependency installation, and coordinate tooling reporting during PR/CI builds. This means that a dev working locally can reproduce exactly what the build machine is doing.

A Brief Overview of Tox

A Monorepo and Tox in Harmony

Traditionally, the tox.ini file for a package sits alongside the setup.py in source code. The azure-sdk-for-python necessarily does not adhere to this policy. There are over one-hundred packages contained here-in. That's a lot of tox.ini files to maintain!

Instead, the CI system leverages an tox plugin called tox-monorepo. This plugin allows tox to act as if the tox.ini is located in whatever directory you executed tox in!

Tox Environments

A given tox.ini works on the concept of test environments. A given test environment is a combination of:

  1. An identifier (or identifiers)
  2. A targeted Python version
    1. tox will default to base python executing the tox command if no Python environment is specified
  3. (optionally) an OS platform

Internally tox leverages virtualenv to create each test environment's virtual environment.

This means that once the tox workflow is in place, all tests will be executed within a virtual environment.

To see the default environments from a specific tox.ini file, use the command tox -l in the same directory as the file itself.

sdk-for-python/eng/tox> tox -l


whl
sdist

Unfortunately, the command tox -l only returns the default test builds. The common tox.ini file also supports lint and mypy environments.

Example Usage of the common Azure SDK For Python tox.ini

Basic usage of tox within this monorepo is:

  1. pip install tox tox-monorepo
  2. cd to target package folder
  3. run tox -c path/to/tox.ini

The common tox.ini location is eng/tox/tox.ini within the repository.

If at any time you want to blow away the tox created virtual environments and start over, simply append -r to any tox invocation!

Example azure-core mypy

  1. cd to sdk/core/azure-core
  2. Run tox -e mypy -c ../../../eng/tox/tox.ini

Example azure-storage-blob tests

  1. cd to sdk/storage/azure-storage-blob
  2. Execute tox -c ../../../eng/tox/tox.ini

Note that we didn't provide an environment argument for this example. Reason here is that the default environment selected by our common tox.ini file is one that runs pytest.

whl environment

Used for test execution across the spectrum of all the platforms we want to support. Maintained at a platform specific level just in case we run into platform-specific bugs.

  • Installs the wheel, runs tests using the wheel
\> tox -e whl -c <path to tox.ini>

sdist environment

Used for the local dev loop.

  • Installs package in editable mode
  • Runs tests using the editable mode installation, not the wheel

\> tox -e sdist -c <path to tox.ini>

lint environment

Pylint install and run.

\> tox -e lint -c <path to tox.ini>

mypy environment

Mypy install and run.

\> tox -e mypy -c <path to tox.ini>

Custom Pytest Arguments

tox supports custom arguments, and the defined pytest environments within the common tox.ini also allow these. Essentially, separate the arguments you want passed to pytest by a -- in your tox invocation.

Tox Documentation on Positional Arguments

Example: Invoke tox, breaking into the debugger on failure tox -e whl -c ../../../eng/tox/tox.ini -- --pdb

Performance Testing

SDK performance testing is supported via the custom perfstress framework. For full details on this framework, and how to write and run tests for an SDK - see the perfstress tests documentation.

More Reading

We maintain an additional document that has a ton of detail as to what is actually happening in these executions.

Dev Feed

Daily dev build version of Azure sdk packages for python are available and are uploaded to Azure devops feed daily. We have also created a tox environment to test a package against dev built version of dependent packages. Below is the link to Azure devops feed. https://dev.azure.com/azure-sdk/public/_packaging?_a=feed&feed=azure-sdk-for-python

To install latest dev build version of a package
pip install <package-name> --extra-index-url https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-python/pypi/simple --pre

To Install a specific dev build version of a package

For e.g.

pip install azure-appconfiguration==1.0.0b6.dev20191205001 --extra-index-url https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-python/pypi/simple

To test a package being developed against latest dev build version of dependent packages: a. cd to package root folder b. run tox environment devtest

\> tox -e devtest -c <path to tox.ini>

This tox test( devtest) will fail if installed dependent packages are not dev build version.

Code of Conduct

This project's code of conduct can be found in the CODE_OF_CONDUCT.md file (v1.4.0 of the https://contributor-covenant.org/ CoC).