n> <span style="color:#a6e22e">StatefulTest</span> <span style="color:#66d9ef">extends</span> <span style="color:#a6e22e">TestSuite</span> <span style="color:#66d9ef">with</span> <span style="color:#a6e22e">State</span><span style="color:#f92672">[</span><span style="color:#66d9ef">Cart</span><span style="color:#f92672">]</span><span style="color:#66d9ef">:</span>
  <span style="color:#960050;background-color:#1e0010">&#34;</span><span style="color:#66d9ef">an</span> <span style="color:#66d9ef">empty</span>