node/test/simple/test-regress-GH-4027.js

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var common = require('../common');
var assert = require('assert');
var path = require('path');
var fs = require('fs');

var filename = path.join(common.tmpDir, 'watched');
fs.writeFileSync(filename, 'quis custodiet ipsos custodes');
setTimeout(fs.unlinkSync, 100, filename);

var seenEvent = 0;
process.on('exit', function() {
  assert.equal(seenEvent, 1);
});

fs.watchFile(filename, { interval: 50 }, function(curr, prev) {
  assert.equal(prev.nlink, 1);
  assert.equal(curr.nlink, 0);
  fs.unwatchFile(filename);
  seenEvent++;
});