r:#ae81ff">1</span>
expect<span style="color:#f92672">(</span><span style="color:#a6e22e">Some</span><span style="color:#f92672">(</span><span style="color:#ae81ff">42</span><span style="color:#f92672">)).</span>toEqual<span style="color:#f92672">(</span><span style="color:#a6e22e">Some</span><span style="color:#f92672">(</span><span style="color:#ae81ff">43</span><span style="color:#f92672">))</span>
</code></pre></div><p>In this case, a custom equality definition for <code>Int</code> says that two values
