test/index.html

<!DOCTYPE html>
<html>
<head>
    <title>ol-layerswitcher spec runner</title>
    <meta charset="utf-8">
    <link rel="stylesheet" type="text/css" href="../node_modules/mocha/mocha.css">
    <link rel="stylesheet" href="https://openlayers.org/en/v5.1.3/css/ol.css" />
    <link rel="stylesheet" type="text/css" href="../src/ol-layerswitcher.css">
</head>
<body>
<div id="mocha"></div>
<script type="text/javascript" src="../node_modules/jquery/dist/jquery.js"></script>
<script type="text/javascript" src="../node_modules/expect.js/index.js"></script>
<script type="text/javascript" src="../node_modules/mocha/mocha.js"></script>
<script type="text/javascript" src="../node_modules/lodash/dist/lodash.js"></script>
<script>
    mocha.setup({
        ui: 'bdd',
        bail: false
    });
</script>
<script src="https://openlayers.org/en/v5.1.3/build/ol.js"></script>
<script type="text/javascript" src="../dist/ol-layerswitcher.js"></script>
<script type="text/javascript" src="spec/ol-layerswitcher.js"></script>
<script type="text/javascript" src="spec/twomaps.js"></script>
<script type="text/javascript" src="spec/renderpanel.js"></script>
<script>
    mocha.run();
</script>
</body>
</html>