How to find children of nodes using BeautifulSoup

I want to get all the <a> tags which are children of <li>:

<div>
<li class="test">
    <a>link1</a>
    <ul> 
       <li>  
          <a>link2</a> 
       </li>
    </ul>
</li>
</div>

I know how to find element with particular class like this:

soup.find("li", { "class" : "test" }) 

But I don't know how to find all <a> which are children of <li class=test> but not any others.

Like I want to select:

<a>link1</a>