var less; // Dist fallback for NPM-installed Less (for plugins that do testing) try { less = require('../tmp/less.cjs.js'); } catch (e) { less = require('../dist/less.cjs.js'); } var fs = require('fs'); var input = fs.readFileSync('./test/less/modifyVars/extended.less', 'utf8'); var expectedCss = fs.readFileSync('./test/css/modifyVars/extended.css', 'utf8'); var options = { modifyVars: JSON.parse(fs.readFileSync('./test/less/modifyVars/extended.json', 'utf8')) }; less.render(input, options, function (err, result) { if (err) { console.log(err); } if (result.css === expectedCss) { console.log('PASS'); } else { console.log('FAIL'); } });