o">.</span><span class="n">propertyOptional</span><span class="p">,</span> <span class="kc">nil</span><span class="p">)</span>
<span class="kt">XCTAssertEqual</span><span class="p">(</span><span class="n">mock</span><span class="o">.</span><span class="n">propertyImplicit</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>

<span class="n">mock</span><span class="o">.</span><span class="n">propertyOptional</span> <span class="o">=</span> <span class="mi">2</span>
<span class="kt