web/web_widget_slickroom/templates/assets.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2017 LasLabs Inc.
     License LGPL-3.0 or later (http://www.gnu.org/licenses/lgpl). -->

<odoo>
    <template id="assets_slickroom" inherit_id="web.assets_backend">
        <xpath expr="//script[last()]" position="after">
            <link rel="stylesheet"
                  type="text/less"
                  href="/web_widget_slickroom/static/src/less/web_widget_slickroom.less"
                  />
            <script type="application/javascript"
                    src="/web_widget_slickroom/static/src/js/web_widget_slickroom.js"
                    />
        </xpath>
    </template>

    <template id="qunit_suite" inherit_id="web.qunit_suite">
        <xpath expr="//t[@t-set='head']" position="inside">
            <script type="application/javascript"
                    src="/web_widget_slickroom/static/tests/js/web_widget_slickroom.js"
                    />
        </xpath>
    </template>
</odoo>