anchor.diff:      volumes:
         - ".:/plugin:ro"
   ```
  +{: codeblock-file="docker-compose.yml"
   
   You can now run the tests using the following command:
   
  
positive.code:     volumes:
        - ".:/plugin:ro"
  ```
  
  You can now run the tests using the following command:
  
  
negative.code: 
  ### Add a plugin.yml
  
  Next we'll create `plugin.yml` to describes how the plugin appears in the [Buildkite Plugin Directory](/docs/plugins/directory).
  
  ```yaml
  name: File Counter
  