test: test for make_engines that are aliases referring to a sequence of variants.
<h3>API Search</h3>
<form class="search" action="api/search.html" method="get">
<input type="text" name="q" size="18" /> <input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>