Buildkite RSpec JUnit Example

This example pipeline shows you how to annotate your builds with RSpec Junit error information and the buildkite-agent annotate CLI command (requires buildkite-agent v3.0-beta.23 or newer).

How does it work?

Test annotations use 2 features within Buildkite:

1. The buildkite-agent annotate command that allows you add arbiraty HTML and Markdown to the top of a build page
2. A wait step with continue_on_failure: true which tells the pipeline to continue in the event of a failed step

The pipeline.yml file can be seen here: https://github.com/buildkite/rspec-junit-example/blob/master/.buildkite/pipeline.yml

Here's the first step:

- label: ":rspec:"
  artifact_paths: "tmp/rspec-*.xml"
  commands:
    - "bundle"
    - "rspec --format progress --format RspecJunitFormatter --out tmp/rspec-$BUILDKITE_JOB_ID.xml"
  plugins:
    - docker#v1.0.0:
        image: "ruby:2.4"
        workdir: /app

This step runs our "rspec" command within a Ruby docker container, and stores the JUnit XML data to an artifact at "tmp/rspec-f59b96d7-5d75-42a6-ab9b-d4cea59db2b2.xml"

The next step:

 - wait: ~
   continue_on_failure: true

Tells Buildkite that if there's a failure in the previous stage of the pipeline (in this case, the "RSpec" tests) that it should continue the pipeline. Usually, the wait step will fail the pipeline at this point since there was an error - but this option changes that behaviour.

- label: ":junit:"
  commands:
    - .buildkite/junit.sh

The last step is the one that parses our JUnit XML files, and turns them into a Buildkite annotation. Here's the script that creates the actual annotation:

#!/bin/bash

set -euo pipefail

mkdir -p tmp

echo "--- :junit: Download the junits"
buildkite-agent artifact download tmp/rspec-*.xml tmp

echo "--- :junit::ruby: Processing the junits"
docker run --rm -v "$(pwd):/app" ruby:2.4 bash -c "cd /app && gem install nokogiri --quiet --silent && ruby /app/.buildkite/lib/junit.rb /app/tmp/*.xml" > tmp/annotation.md

echo "--- :buildkite: Creating annotation"
buildkite-agent annotate --context junit --style error < tmp/annotation.md

We wrote our JUnit XML parser in Ruby (you can write it in what ever language you like), but all it does it parse all the rspec-*.xml files, grabs the errors, and turns it some HTML that looks like this:

<p>There were 3 failures:</p>

<details>
<summary><code>Calculator#multiply multiplies numbers together in spec.lib.calculator_spec</code></summary>

<code><pre>expected: 8
     got: 6

(compared using eql?)

./spec/lib/calculator_spec.rb:21:in `block (3 levels) in '</pre></code>

in <a href="#f59b96d7-5d75-42a6-ab9b-d4cea59db2b2">Job #f59b96d7-5d75-42a6-ab9b-d4cea59db2b2</a>
</details>

...
</div>

We then pipe that HTML into the buildkite-agent annotate command and change the style of annotation to error so it shows up as red and with a cross in the Buildkite UI.

- wait

- command: ".buildkite/deploy.sh"
  label: ":rocket:"

The final 2 steps demonstrate that the pipeline doesn't continue any further since there was an error in one of the previous stages. If this wait step also had continue_on_failure: true then it would also continue.

License

See License.md (MIT)