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arduino_ci · Actions · GitHub Marketplace · GitHub

This repository is for the GitHub Action to run arduino_ci on a repository containing an Arduino library. You can also run it locally with Docker, right now, if that's easier -- see below.

• Contributions to your Arduino library are tested automatically, without the need for hardware present
• Example sketches in your examples/ directory are compiled automatically, to detect broken code in the default branch

• arduino-lint action for verifying metadata (e.g. library.properties) and structural aspects of a library

1. Create a new YAML file in your repository's .github/workflows directory, e.g. .github/workflows/arduino_ci.yml
2. Copy an example workflow from below into that new file, no extra configuration required
3. Commit that file to a new branch
4. Open up a pull request and observe the action working
5. Merge into your default branch to enable testing of all following pull requests

There are several ways to specify what version of the action to run.

Using Arduino-CI/action@stable-1.x is recommended, so the contents listed below for .github/workflows/arduino_ci.yml should work for most users.

---
name: Arduino_CI

on: [pull_request]

jobs:
  arduino_ci:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - uses: Arduino-CI/action@stable-1.x

The full set of configuration options for the action is enumerated here; note that if the env: section is empty, it must be commented out or deleted as well.

---
name: Arduino_CI

on: [pull_request]

jobs:
  arduino_ci:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v3
      - uses: Arduino-CI/action@stable-1.x   # or latest, or a pinned version
        env:
          # Not all libraries are in the root directory of a repository.
          # Specifying the path of the library here (relative to the root
          # of the repository) will adjust that.
          #
          # The default is the current directory
          #
          USE_SUBDIR: .

          # Not all libraries include examples or unit tests.  The default
          #  behavior of arduino_ci is to assume that "if the files don't
          #  exist, then they were not MEANT to exist".  In other words,
          #  if you were to accidentally delete all your tests or example
          #  sketches, then the CI runner would by default assume that was
          #  intended and return a passing result.
          #
          # If you'd rather have the test runner fail the test in the
          #  absence of either tests or examples, uncommenting either of
          #  the following variables to 'true' (as appropriate) will
          #  enforce that.
          #
          EXPECT_EXAMPLES: false
          EXPECT_UNITTESTS: false

          # Although dependencies will be installed automatically via the
          # library manager, your library under test may require an
          # unofficial version of a dependency.  In those cases, the custom
          # libraries must be insalled prior to the test execution; those
          # installation commands should be placed in a shell script (that
          # will be executed by /bin/sh) stored in your library.
          #
          # Then, set this variable to the path to that file (relative to
          # the root of your repository).  The script will be run from
          # within the Arduino libraries directory; you should NOT attempt
          # to find that directory nor change to it from within the script.
          #
          # CUSTOM_INIT_SCRIPT: install_dependencies.sh

You can show Arduino CI status with a badge in your repository README.md

[![Arduino CI](https://github.com/<OWNER>/<REPOSITORY>/workflows/Arduino_CI/badge.svg)](https://github.com/marketplace/actions/arduino_ci)

Note that

• you must replace <OWNER> with your GitHub username
• you must replace <REPOSITORY> with the name of the GitHub repository
• Arduino_CI in the URL must match the name: Arduino_CI line in the example YAML files above

When configuring the test runner itself, it's more efficient to run arduino_ci locally -- it works on the same OSes as the Arduino IDE. Instructions for setting that up can be found at the arduino_ci project homepage on GitHub. If you are using OSX or Linux, you have the additional option of running Arduino CI directly from Docker -- see below.

For information on Arduino unit testing with arduino_ci, see the REFERENCE.md for Arduino CI's section on unit testing

By default, any unit tests and example sketches are tested against a modest set of Arduino platforms. If you have architectures defined in library.properties, that will further refine the set of what is tested. You can further override this configuration in several specific ways; for details, see the REFERENCE.md for Arduino CI's section on CI configuration

The default configuration is available in the arduino_ci project, and shows how the platforms and packages are configured (including 3rd-party board provider information).

The same Docker image used by the GitHub action is available for local testing, and should function properly on Linux and OSX hosts with Docker installed. Choose the command that best matches the state of your project, and use the `-

In this situation, you've got a mix of libraries installed locally (the one that will be tested amongst any possible dependencies), and they all work as expected (even though you're not quite sure all of them are up to date, nor whether they have local modifications that aren't part of the official library release). This setup won't work in CI, but by volume-mounting the libraries directory into the container and using your own library as the working directory, you can ensure that arduino_ci is using the exact same set of dependencies.

This is also the fastest way to test new versions of dependencies.

You would run the following (substituting your own library's name in place of mylib):

docker run --rm \
  -v "/pathTo/Arduino/libraries:/root/Arduino/libraries" \
  --workdir /root/Arduino/libraries/mylib \
  docker.pkg.github.com/arduino-ci/action/ubuntu

In this situation, the only libraries you need for your library to work are those that you've downloaded directly from the library manager and no special modifications need to be made. We simply volume mount the library under test into the container, set that directory to be the working directory, and let the arduino_ci test runner install the dependencies directly.

If your project does not include a library.properties that defines your project's name, you should change library_under_test to mylib.

docker run --rm \
  -v "/pathTo/Arduino/libraries/mylib:/library_under_test" \
  --workdir /library_under_test \
  docker.pkg.github.com/arduino-ci/action/ubuntu

In this situation, you have a custom library that can't be installed by the library manager. Fortunately, you've supplied an install.sh script that will download and unpack a library to the current working directory (which Arduino CI's test runner will run from inside the container's Arduino libraries directory). Note the relative path used for install.sh.

docker run --rm \
  -v "/pathTo/Arduino/libraries/mylib:/library_under_test" \
  --workdir /library_under_test \
  --env CUSTOM_INIT_SCRIPT=install.sh \
  docker.pkg.github.com/arduino-ci/action/ubuntu

All the bells and whistles. Note that the relative path of install.sh is considered after the USE_SUBDIR directory has been applied.

docker run --rm \
  -v "/pathTo/Monorepo:/library_under_test" \
  --workdir /library_under_test \
  --env USE_SUBDIR=mylib \
  --env CUSTOM_INIT_SCRIPT=install.sh \
  docker.pkg.github.com/arduino-ci/action/ubuntu

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