><span class="nf">simpleMehtodThatReturns</span><span class="p">(</span><span class="nv">optionalParam</span><span class="p">:</span> <span class="o">.</span><span class="nf">value</span><span class="p">(</span><span class="kc">nil</span><span class="p">),</span> <span class="nv">willReturn</span><span class="p">:</span> <span class="s">"is nil"</span><span class="p">))</span>

<span class="kt">XCTAssertNotEqual</span><span class="p">(</span><span class="n">mock</span><span class="o">.</span><span class="nf