node/test/parallel/test-console-clear.js

'use strict';

const common = require('../common');
const assert = require('assert');

const stdoutWrite = process.stdout.write;

// The sequence for moving the cursor to 0,0 and clearing screen down
const check = '\u001b[1;1H\u001b[0J';

function doTest(isTTY, check) {
  let buf = '';
  process.stdout.isTTY = isTTY;
  process.stdout.write = (string) => buf += string;
  console.clear();
  process.stdout.write = stdoutWrite;
  assert.strictEqual(buf, check);
}

// Fake TTY
if (!common.isDumbTerminal) {
  doTest(true, check);
}
doTest(false, '');