n> <span class="p">(</span><span class="n">error</span><span class="p">)</span> <span class="k">in</span>
    <span class="k">guard</span> <span class="k">let</span> <span class="nv">error</span> <span class="o">=</span> <span class="n">error</span> <span class="k">else</span> <span class="p">{</span> <span class="k">return</span> <span class="p">}</span>
    <span class="kt">XCTFail</span><span class="p">(</span><span class="s">"Error: </span><span class="se">\(</span><span class="n">error</span><span clas