d00114">TL;DRs</a>
            <ol>
</ol>
      </li>
</ol>
      </li>
  <li data-type="chapter">
    <a href="ch13.html">Test Doubles</a>
            <ol>
  <li data-type="sect1">
    <a href="ch13.html#the_impact_of_test_doubles_on_software">The Impact of Test Doubles on Software Development</a>
            <ol>
</ol>
      </li>
  <li data-type="sect1">
    <a href="ch13.html#test_doubles_at_google">Test Doubles at Google</a>
            <ol>
</ol>
      </li>
  <li data-type="sect1">
    <a href="ch13.