Add how to setup and run test locally

CONTRIBUTING.md

@@ -9,3 +9,57 @@ https://help.github.com/articles/using-pull-requests
 You should fork the project into your own repo, create a topic branch
 there and then make one or more pull requests back to the openstreetmap/chef repository.
 Your pull requests will then be reviewed and discussed.
+
+## Running the Infrastructure Tests locally
+
+- **[Cookstyle](https://docs.chef.io/workstation/cookstyle/)** is used for linting, ensuring that our Chef recipes follow style guidelines and best practices.
+- **[Test Kitchen](https://kitchen.ci/)** combined with **InSpec** and [Dokken](https://github.com/test-kitchen/kitchen-dokken) is used to verify the functionality of our Chef code, ensuring it behaves as expected.
+
+The following guidelines are to help set up and run these checks locally:
+
+#### **1. Install Docker**
+- Visit [Docker's official site](https://www.docker.com/products/docker-desktop) to download and install Docker Desktop for Mac.
+
+#### **2. Install Homebrew (Apple MacOS only)**
+- Install Homebrew by following the instructions [here](https://brew.sh/).
+
+#### **3. Install rbenv (recommended)**
+- Install rbenv by following the instructions [here](https://github.com/rbenv/rbenv#installation).
+
+rbenv is a ruby version manager. rbenv allows projects to use a different version of ruby than the version of install with your operating system.
+
+> *Note on rbenv: While we recommend using rbenv for managing Ruby versions, it's not strictly necessary. If you have Ruby already installed feel free to use that. If you're not using rbenv, simply omit the `rbenv exec` prefix from the commands below.*
+
+#### **4. Install Required Ruby Version (recommended)**
+Navigate to the git checkout of the OpenStreetMap chef repo and run:
+```bash
+rbenv install
+```
+This will install the recommended version of ruby for running the tests. The recommended version of ruby is defined in the [.ruby-version](.ruby-version) file.
+
+#### **5. Install Dependencies with Bundler**
+```bash
+rbenv exec gem install bundler
+rbenv exec bundler install
+```
+This will install the [bundler](https://bundler.io/), the ruby gem packages manager, and then uses `bundler`` to install the required gem packages for the tests.
+
+#### **6. Run Cookstyle for Linting and Style Checks**
+```bash
+rbenv exec bundle exec cookstyle
+```
+This will run [cookstyle](https://docs.chef.io/workstation/cookstyle/) a linting tool which reports on any linting issues.
+
+> *Automatically run cookstyle lint: We have a sample [git pre-commit hook](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks) in the `hooks/pre-commit` file which can be copied to the local checkout of this repo to the file `.git/hooks/pre-commit`  to ensure the lint passes when running a git commit.*
+
+#### **7. List Available Tests**
+```bash
+rbenv exec bundler exec kitchen list
+```
+This lists the [Test Kitchen](https://kitchen.ci/) tests which are available. The list of tests is generated from the definitions in the [.kitchen.yml](.kitchen.yml) file. The individual tests are written in [InSpec](https://docs.chef.io/inspec/) and are stored in the `test/integration/` directory.
+
+#### **8. Run an Example Test**
+```bash
+rbenv exec bundler exec kitchen test dns-ubuntu-2204
+```
+This runs the [Test Kitchen](https://kitchen.ci/) [InSpec](https://docs.chef.io/inspec/) `dns` tests using the `Ubuntu 22.04` platform. The tests are run inside a Docker container using the Test Kitchen [Dokken driver](https://github.com/test-kitchen/kitchen-dokken).

README.md

@@ -37,9 +37,10 @@ We use the 'Organization Repository' approach, where we have all our cookbooks i
 
 # Contributing
 
-Contributions are welcome! Please see [CONTRIBUTING.md](CONTRIBUTING.md) for more details.
+Contributions are welcome! Please see [CONTRIBUTING.md](CONTRIBUTING.md) for more details. The guide also includes details on how to run the tests locally.
 
 # Contact Us
 
 * Twitter: [@OSM_Tech](https://twitter.com/OSM_Tech)
+* Mastodon / Fediverse: [@OSM_Tech](https://en.osm.town/@osm_tech)
 * IRC: [#OSM-Dev on irc.oftc.net](https://irc.openstreetmap.org/)