for Desbest_Brands not working

config.xml

<?xml version="1.0"?>
<config>
    <modules>
        <Desbest_Brands>
            <version>1</version>
        </Desbest_Brands>
    </modules>
    <frontend>
        <routers>
            <brands>
                <use>standard</use>
                <args>
                    <module>Desbest_Brands</module>
                    <frontName>brands</frontName>
                </args>
            </brands>
        </routers>
        <layout>
            <updates>
                <test>
                    <file>Desbest_Brands/layout.xml</file>
                </test>
            </updates>
        </layout>
    </frontend>
    <global>
        <blocks>
            <brands>
                <class>Desbest_Brands_Block</class>
            </brands>
        </blocks>
        <helpers>
            <brands>
                <class>Desbest_Brands_Helper</class>  
            </brands>
        </helpers>
    </global>
    <admin>
        <routers>
            <brands>
                <use>admin</use>
                <args>
                    <module>Desbest_Brands</module>
                    <frontName>brands</frontName>
                </args>
            </brands>
        </routers>
    </admin>
    <adminhtml>
        <layout>
        <updates>
            <brands>
                <files>Desbest_Brands/adminlayout.xml</files>
            </brands>
        </updates>
        </layout>
    </adminhtml>
</config>