
<h2>Unit Tests</h2>
<p>Use a fake client: <code>sigs.k8s.io/controller-runtime/pkg/client/fake</code></p>
<h2>Integration Tests</h2>
<p>Some of the tools to facilitate integration tests (ordered by complexity of the test cases.)</p>
<table>
  <thead>
    <tr>
      <th>Tool</th>
      <th>Note</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>kuttl</td>
      <td>only for CRUD</td>
    </tr>
    <tr>
      <td>envtest</td>
      <td>only k8s API server + etcd</td>
    </tr>
    <tr>
      <td>kind</td>
      <td>complete k8s cluster</td>
    </tr>
  </tbody>
</table>
<p>More details:</p>
<ul>
  <li><strong>kuttl</strong>: test k8s operators using only YAML (no Go code), good for CRUD testing.
    <ul>
      <li><a href="https://kuttl.dev/">https://kuttl.dev/</a></li>
    </ul>
  </li>
  <li><strong>envtest</strong>:
    <ul>
      <li>Running locally, only k8s API server + etcd; NO kubelet, controller-manager or other components.</li>
      <li>Good for testing controllers.</li>
      <li>Part of <code>controller-runtime</code> (<code>sigs.k8s.io/controller-runtime/pkg/envtest</code>)</li>
    </ul>
  </li>
  <li><strong>kind</strong>:
    <ul>
      <li><a href="https://kind.sigs.k8s.io/">https://kind.sigs.k8s.io/</a></li>
      <li>creates k8s clusters in docker.</li>
    </ul>
  </li>
</ul>
<h2>E2E Tests</h2>
<p>In a real or simulated environment.</p>
<p>E.g. functional, load &#x26; performance, disaster recovery, upgrade.</p>


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Tool	Note
kuttl	only for CRUD
envtest	only k8s API server + etcd
kind	complete k8s cluster