Function cssNormalizeClass

test/lib/testHelper.js:2533–2535

(classes)

    }

    function cssNormalizeClass(classes) {
        return classes.replace(/^\s+|\s+$/g, '').replace(/\s+/g, ' ');
    }

    /**
     * JSON.stringify(obj, null, 2) will vertically layout array, which takes too much space.