/span><span class="op">(</span><span class="st">"annotate_cell_types returns expected format"</span>, <span class="op">{</span></span>
<span>  <span class="co"># Setup test data</span></span>
<span>  <span class="va">test_markers</span> <span class="op">&lt;-</span> <span class="fu"><a href="https://rdrr.io/r/base/data.frame.html" class="external-link">data.frame</a></span><span class="op">(</span></span>
<span>    cluster <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" cl