> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/open-source/use-harness-open-source/pipelines-1/samples/crystal.md).

# Crystal

This guide covers configuring continuous integration pipelines for Crystal projects.

## Build and Test <a href="#build-and-test" id="build-and-test"></a>

In the below example we demonstrate a pipeline that executes `shards install` and `crystal spec` commands. These commands are executed inside the crystal Docker container, downloaded at runtime from DockerHub.

```yaml
kind: pipeline
spec:
  stages:
  - type: ci
    spec:
      steps:
      - name: test
        type: run
        spec:
          container: crystallang/crystal
          script: |-
            shards install
            crystal spec
```

Please note that you can use any Docker image in your pipeline from any Docker registry. You can use the official crystal [images](https://hub.docker.com/r/crystallang/crystal/), or your can bring your own.