n style="color:#66d9ef">:</span>
          cart <span style="color:#66d9ef">=&gt;</span> expect<span style="color:#f92672">(</span>cart<span style="color:#f92672">.</span>totalQuantity<span style="color:#f92672">).</span>toEqual<span style="color:#f92672">(</span><span style="color:#ae81ff">5</span><span style="color:#f92672">)</span>

<span style="color:#66d9ef">case</span> <span style="color:#66d9ef">class</span> <span style="color:#a6e22e">CartItem</span><span style="color:#f92672">(</span>artNo<span sty