nodejs/test/parallel/test-fs-long-path.js

// Copyright Joyent, Inc. and other Node contributors.
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'use strict';
const common = require('../common');
if (!common.isWindows)
  common.skip('this test is Windows-specific.');

const fs = require('fs');
const path = require('path');

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

// Make a path that will be at least 260 chars long.
const fileNameLen = Math.max(260 - tmpdir.path.length - 1, 1);
const fileName = tmpdir.resolve('x'.repeat(fileNameLen));
const fullPath = path.resolve(fileName);

tmpdir.refresh();

console.log({
  filenameLength: fileName.length,
  fullPathLength: fullPath.length
});

fs.writeFile(fullPath, 'ok', common.mustSucceed(() => {
  fs.stat(fullPath, common.mustSucceed());

  // Tests https://github.com/nodejs/node/issues/39721
  fs.realpath.native(fullPath, common.mustSucceed());

  // Tests https://github.com/nodejs/node/issues/51031
  fs.promises.realpath(fullPath).then(common.mustCall(), common.mustNotCall());
}));