# How to contribute to ANTA Contribution model is based on a fork-model. Don't push to arista-netdevops-community/anta directly. Always do a branch in your forked repository and create a PR. To help development, open your PR as soon as possible even in draft mode. It helps other to know on what you are working on and avoid duplicate PRs. ## Create a development environment Run the following commands to create an ANTA development environment: ```bash # Clone repository $ git clone https://github.com/arista-netdevops-community/anta.git $ cd anta # Install ANTA in editable mode and its development tools $ pip install -e .[dev] # To also install the CLI $ pip install -e .[dev,cli] # Verify installation $ pip list -e Package Version Editable project location ------- ------- ------------------------- anta 0.15.0 /mnt/lab/projects/anta ``` Then, [`tox`](https://tox.wiki/) is configured with few environments to run CI locally: ```bash $ tox list -d default environments: clean -> Erase previous coverage reports lint -> Check the code style type -> Check typing py38 -> Run pytest with py38 py39 -> Run pytest with py39 py310 -> Run pytest with py310 py311 -> Run pytest with py311 report -> Generate coverage report ``` ### Code linting ```bash tox -e lint [...] lint: commands[0]> black --check --diff --color . All done! ✨ 🍰 ✨ 104 files would be left unchanged. lint: commands[1]> isort --check --diff --color . Skipped 7 files lint: commands[2]> flake8 --max-line-length=165 --config=/dev/null anta lint: commands[3]> flake8 --max-line-length=165 --config=/dev/null tests lint: commands[4]> pylint anta -------------------------------------------------------------------- Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00) .pkg: _exit> python /Users/guillaumemulocher/.pyenv/versions/3.8.13/envs/anta/lib/python3.8/site-packages/pyproject_api/_backend.py True setuptools.build_meta lint: OK (19.26=setup[5.83]+cmd[1.50,0.76,1.19,1.20,8.77] seconds) congratulations :) (19.56 seconds) ``` ### Code Typing ```bash tox -e type [...] type: commands[0]> mypy --config-file=pyproject.toml anta Success: no issues found in 52 source files .pkg: _exit> python /Users/guillaumemulocher/.pyenv/versions/3.8.13/envs/anta/lib/python3.8/site-packages/pyproject_api/_backend.py True setuptools.build_meta type: OK (46.66=setup[24.20]+cmd[22.46] seconds) congratulations :) (47.01 seconds) ``` > NOTE: Typing is configured quite strictly, do not hesitate to reach out if you have any questions, struggles, nightmares. ## Unit tests To keep high quality code, we require to provide a Pytest for every tests implemented in ANTA. All submodule should have its own pytest section under `tests/units/anta_tests/.py`. ### How to write a unit test for an AntaTest subclass The Python modules in the `tests/units/anta_tests` folder define test parameters for AntaTest subclasses unit tests. A generic test function is written for all unit tests in `tests.lib.anta` module. The `pytest_generate_tests` function definition in `conftest.py` is called during test collection. The `pytest_generate_tests` function will parametrize the generic test function based on the `DATA` data structure defined in `tests.units.anta_tests` modules. See https://docs.pytest.org/en/7.3.x/how-to/parametrize.html#basic-pytest-generate-tests-example The `DATA` structure is a list of dictionaries used to parametrize the test. The list elements have the following keys: - `name` (str): Test name as displayed by Pytest. - `test` (AntaTest): An AntaTest subclass imported in the test module - e.g. VerifyUptime. - `eos_data` (list[dict]): List of data mocking EOS returned data to be passed to the test. - `inputs` (dict): Dictionary to instantiate the `test` inputs as defined in the class from `test`. - `expected` (dict): Expected test result structure, a dictionary containing a key `result` containing one of the allowed status (`Literal['success', 'failure', 'unset', 'skipped', 'error']`) and optionally a key `messages` which is a list(str) and each message is expected to be a substring of one of the actual messages in the TestResult object. In order for your unit tests to be correctly collected, you need to import the generic test function even if not used in the Python module. Test example for `anta.tests.system.VerifyUptime` AntaTest. ``` python # Import the generic test function from tests.lib.anta import test # noqa: F401 # Import your AntaTest from anta.tests.system import VerifyUptime # Define test parameters DATA: list[dict[str, Any]] = [ { # Arbitrary test name "name": "success", # Must be an AntaTest definition "test": VerifyUptime, # Data returned by EOS on which the AntaTest is tested "eos_data": [{"upTime": 1186689.15, "loadAvg": [0.13, 0.12, 0.09], "users": 1, "currentTime": 1683186659.139859}], # Dictionary to instantiate VerifyUptime.Input "inputs": {"minimum": 666}, # Expected test result "expected": {"result": "success"}, }, { "name": "failure", "test": VerifyUptime, "eos_data": [{"upTime": 665.15, "loadAvg": [0.13, 0.12, 0.09], "users": 1, "currentTime": 1683186659.139859}], "inputs": {"minimum": 666}, # If the test returns messages, it needs to be expected otherwise test will fail. # NB: expected messages only needs to be included in messages returned by the test. Exact match is not required. "expected": {"result": "failure", "messages": ["Device uptime is 665.15 seconds"]}, }, ] ``` ## Git Pre-commit hook ```bash pip install pre-commit pre-commit install ``` When running a commit or a pre-commit check: ``` bash ❯ echo "import foobaz" > test.py && git add test.py ❯ pre-commit pylint...................................................................Failed - hook id: pylint - exit code: 22 ************* Module test test.py:1:0: C0114: Missing module docstring (missing-module-docstring) test.py:1:0: E0401: Unable to import 'foobaz' (import-error) test.py:1:0: W0611: Unused import foobaz (unused-import) ``` > NOTE: It could happen that pre-commit and tox disagree on something, in that case please open an issue on Github so we can take a look.. It is most probably wrong configuration on our side. ## Configure MYPYPATH In some cases, mypy can complain about not having `MYPYPATH` configured in your shell. It is especially the case when you update both an anta test and its unit test. So you can configure this environment variable with: ```bash # Option 1: use local folder export MYPYPATH=. # Option 2: use absolute path export MYPYPATH=/path/to/your/local/anta/repository ``` ## Documentation [`mkdocs`](https://www.mkdocs.org/) is used to generate the documentation. A PR should always update the documentation to avoid documentation debt. ### Install documentation requirements Run pip to install the documentation requirements from the root of the repo: ```bash pip install -e .[doc] ``` ### Testing documentation You can then check locally the documentation using the following command from the root of the repo: ```bash mkdocs serve ``` By default, `mkdocs` listens to http://127.0.0.1:8000/, if you need to expose the documentation to another IP or port (for instance all IPs on port 8080), use the following command: ```bash mkdocs serve --dev-addr=0.0.0.0:8080 ``` ### Build class diagram To build class diagram to use in API documentation, you can use `pyreverse` part of `pylint` with [`graphviz`](https://graphviz.org/) installed for jpeg generation. ```bash pyreverse anta --colorized -a1 -s1 -o jpeg -m true -k --output-directory docs/imgs/uml/ -c ``` Image will be generated under `docs/imgs/uml/` and can be inserted in your documentation. ### Checking links Writing documentation is crucial but managing links can be cumbersome. To be sure there is no dead links, you can use [`muffet`](https://github.com/raviqqe/muffet) with the following command: ```bash muffet -c 2 --color=always http://127.0.0.1:8000 -e fonts.gstatic.com -b 8192 ``` ## Continuous Integration GitHub actions is used to test git pushes and pull requests. The workflows are defined in this [directory](https://github.com/arista-netdevops-community/anta/tree/main/.github/workflows). We can view the results [here](https://github.com/arista-netdevops-community/anta/actions).