Okay, thank you

I changed the tests to random ones, however I do not quite understand how Preloaded works. Can I insert this code in Preloaded?

  const usercode = require('fs').readFileSync('/home/codewarrior/solution.txt', 'utf8');  
	if (/Math\.pow/.test(usercode)) {
		throw new SyntaxError("You can't use Math.pow()");
	} else if (/\*\*/.test(usercode)) {
		throw new SyntaxError("You can't use ** ");
	}

Please tell me how to do this