src/main/java/com/google/devtools/build/docgen/templates/attributes/test/size.html

<p><code>String "enormous", "large" "medium" or "small",
default is "medium"; optional</code></p>

<p>How "heavy" the test is.</p>

<p>A classification of the test's "heaviness": how much time/resources
it needs to run.</p>

<p>Unittests are considered "small", integration tests "medium", and end-to-end tests "large" or
"enormous". Bazel uses the size to determine a default timeout (which can be overridden using the
<code>timeout</code> attribute) and the amount of resources that have to be acquired for the test to
run. Test sizes correspond to the following resources and default timeouts:</p>

<table style="width: 100%">
  <tr>
    <th>Size</th>
    <th>RAM (in MB)</th>
    <th>CPU (in CPU cores)</th>
    <th>Default timeout</th>
  </tr>
  <tr>
    <td>small</td>
    <td>20</td>
    <td>1</td>
    <td>short (1 minute)</td>
  </tr>
  <tr>
    <td>medium</td>
    <td>100</td>
    <td>1</td>
    <td>moderate (5 minutes)</td>
  </tr>
  <tr>
    <td>large</td>
    <td>300</td>
    <td>1</td>
    <td>long (15 minutes)</td>
  </tr>
  <tr>
    <td>enormous</td>
    <td>800</td>
    <td>1</td>
    <td>eternal (60 minutes)</td>
  </tr>
</table>