Contribute to CumulusCI#

Contributions are welcome, and they are greatly appreciated!

Types of Contributions#

You can contribute in many ways:

Report Bugs#

Report bugs at

When reporting a bug, please include:

  • Your operating system name and version.

  • Any details about your local setup that might be helpful in troubleshooting.

  • Detailed steps to reproduce the bug.

Fix Bugs#

Look through the GitHub issues for bugs. Anything tagged with “bug” and “help wanted” is open to whomever wants to implement it.

Implement Features#

Look through the GitHub issues for features. Anything tagged with “enhancement” and “help wanted” is open to whomever wants to implement it.

Write Documentation#

CumulusCI could always use more documentation, whether as part of the official CumulusCI docs, in docstrings, or even on the web in blog posts, articles, and such.

Submit Feedback#

The best way to send feedback is to file an issue.

If you are proposing a feature:

  • Explain in detail how it would work.

  • Keep the scope as narrow as possible, to make it easier to implement.

  • Remember that this is a volunteer-driven project, and that contributions are welcome :)

Install for Development#

Ready to contribute? Here’s how to set up CumulusCI for local development.

  1. Fork the CumulusCI repo on GitHub.

  2. Clone your fork to your local workspace.

  3. Create a fresh Python 3 virtual environment and activate it (to keep this isolated from other Python software on your machine). Here is one way:

    $ python3 -m venv cci_venv
    $ source cci_venv/bin/activate
  4. Install the development requirements:

    $ make dev-install
  5. Install pre-commit hooks for black and flake8:

    $ pre-commit install --install-hooks
  6. After making changes, run the tests and make sure they all pass:

    $ pytest
  7. Your new code should also have meaningful tests. One way to double check that your tests cover everything is to ensure that your new code has test code coverage:

    $ make coverage
  8. Push your changes to GitHub and submit a Pull Request. The base branch should be a new feature branch that we create to receive the changes (contact us to create the branch). This allows us to test the changes using our build system before merging to main.


We enable typeguard with pytest so if you add type declarations to your code, those declarations will be treated as runtime assertions in your Python tests.

Pull Request Guidelines#

Before you submit a pull request, check that it meets these guidelines:

  • Documentation is updated to reflect all changes.

  • New classes, functions, etc have docstrings.

  • New code has comments.

  • Code style and file structure is similar to the rest of the project.

  • You have run the black code formatter.

  • If you are a new contributor, don’t forget to add yourself to the AUTHORS.rst file in your pull request (either GitHub username, or first/last name).

  • You have labeled your pull request:

    • critical-changes for breaking changes,

    • enhancement for new features,

    • bug for when fixing a bug or closing an issue, or

    • ignore-for-release for internal changes.

Testing CumulusCI#

Org-reliant Automated Tests#

Some tests are marked @pytest.mark.vcr() which means that they can either call into a real (configured) Salesforce org or use a cached YAML file of the request/response.

By default using pytest will use the cached YAML. If you want to work against a real scratch org, you do so like this:

$ pytest --org qa <other arguments and options, such as filename or -k testname>

Where “orgname” is a configured org name like “qa”, “dev”, etc.

To regenerate the VCR file, you can run this command:

$ pytest --replace-vcrs --org qa

This will configure an org named “qa” and regenerate them.

That will run all VCR-backed tests against the org, including all of the slow integration tests.

Running Integration Tests#

Some tests generate so much data that we do not want to store the VCR cassettes in our repo. You can mark tests like that with @pytest.mark.large_vcr(). When they are executed, their cassettes will go in a .gitignore’d folder called large_cassettes.

Do not commit the files (large_cassettes/\*.yml) to the repository.

Some tests generate even more network traffic data and it isn’t practical to use VCR at all. Still, we’d like to run them when we run all of the other org-reliant tests with –org. Mark them with @pytest.mark.needs_org() and they will run with the VCR tests.

Some tests are so slow that you only want to run them on an opt-in basis. Mark these tests with @pytest.mark.slow() and run them with pytest --run-slow-tests or pytest --run-slow-tests --orgname <orgname>.

Writing Integration Tests#

All features should have integration tests which work against real orgs or APIs.

Our test suite makes extensive use of pytest fixtures; the ones below should be used in your tests where appropriate. Search the repo to see examples where they are used in context, or to see their definitions:

  • gh_api - get a fake github API

  • with temp_db():… - create a temporary SQLite Database

  • delete_data_from_org(“Account,Contacts”) - delete named sobjects from an org

  • run_code_without_recording(func) - run a function ONLY when the integration tests are being used against real orgs and DO NOT record the network traffic in a VCR cassette

  • sf - a handle to a simple-salesforce client tied to the current org

  • mock_http_response(status) - make a mock HTTP Response with a particular status

  • runtime - Get the CumulusCI runtime for the current working directory

  • project_config - Get the project config for the current working directory

  • org_config - Get the project config for the current working directory

  • createtask - Get a task _factory which can be used to construct task instances.

  • global_describe - Get a function that will generate the JSON that Salesforce would generate if you do a GET on the /sobjects endpoint

Decorators for tests:

  • pytest.mark.slow(): a slow test that should only be executed when requested with –run-slow-tests

  • pytest.mark.large_vcr(): a network-based test that generates VCR cassettes too large for version control. Use –org to generate them locally.

  • pytest.mark.needs_org(): a test that needs an org (or at least access to the network) but should not attempt to store VCR cassettes. Most tests that need network access do so because they need to talk to an org, but you can also use this decorator to give access to the network to talk to github or any other API.

  • pytest.mark.org_shape(‘qa’, ‘qa_org’): - switch the current org to an org created with org template “qa” after running flow “qa_org”. As with all tests, clean up any changes you make, because this org may be reused by other tests.

A complete list is available with:

$ pytest –markers

Randomized tests#

Tests should be executable in any order. You can run this command a few times to verify if they are:

pytest –random-order

It will output something like this:

Using –random-order-bucket=module Using –random-order-seed=986925

Using those two parameters on the command line, you can replicate a particular run later.

In extremely rare cases where it’s not possible to make tests independent, you can enforce an order