Debugging and Testing

To debug using a local engine and executor without dependencies such as RabbitMQ, make sure your /etc/mistral/mistral.conf has the following settings:

rpc_backend = fake

auth_enable = False

and run the following command in pdb, PyDev or PyCharm:

mistral/cmd/ --server all --config-file /etc/mistral/mistral.conf --use-debugger


In PyCharm, you also need to enable the Gevent compatibility flag in Settings -> Build, Execution, Deployment -> Python Debugger -> Gevent compatible. Without this setting, PyCharm will not show variable values and become unstable during debugging.

Running unit tests in PyCharm

In order to be able to conveniently run unit tests, you need to:

  1. Set unit tests as the default runner:

Settings -> Tools -> Python Integrated Tools -> Default test runner: Unittests

  1. Enable test detection for all classes:

Run/Debug Configurations -> Defaults -> Python tests -> Unittests -> uncheck Inspect only subclasses of unittest.TestCase

Running examples

To run the examples find them in mistral-extra repository ( and follow the instructions on each example.

Automated Tests

On Mistral project we have two separate test suites:

  • Unit tests - executed by Jenkins CI job in OpenStack gerrit (python-style checks and execution of all unit tests)

  • Integration tests - executed by Devstack Gate job in OpenStack Gerrit (integration tests for Mistral after the OpenStack deployment with devstack)

How to execute tests manually

Almost all existing automated tests can be executed manually on the developer’s desktop (except those which check OpenStack actions). To do this, you should clone “mistral” repository (or “python-mistralclient”) and run the corresponding commands.

Cloning a repository:

$ git clone
$ cd mistral

Unit tests

To run all unit tests:

$ tox

To run unit tests against a specific python version:

$ tox -e py35

To run tests from a specific test class (using a specific python version):

tox -e py35 -- 'DataFlowEngineTest'

Integration tests

There are several suites of integration tests the mentioned repositories:


  • mistral_tempest_tests/tests/api/v2/ - contains the tests checking Mistral API v2 related to workflows

  • mistral_tempest_tests/tests/api/v2/ - contains the tests checking Mistral API v2 related to actions

  • and so on


  • mistralclient/tests/functional/cli/v2/ - contains test suites which check interaction with Mistral using CLI

To run integration tests:

  • in OpenStack mode (when auth in Mistral is enabled and Mistral integrates with OpenStack components)

$ pip install git+
$ nosetests mistral-tempest-plugin/mistral_tempest_tests/tests/api/v2
  • in Non-OpenStack mode:

    • set ‘auth_enable=false’ in the mistral.conf under [pecan] group

    • restart Mistral server

    • execute: ./run_functional_tests