nodejs/test/simple/test-fs-exists.js

// Copyright Joyent, Inc. and other Node contributors.
//
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// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
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// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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var common = require('../common');
var assert = require('assert');
var fs = require('fs');
var f = __filename;
var exists;
var doesNotExist;

fs.exists(f, function(y) {
  exists = y;
});

fs.exists(f + '-NO', function(y) {
  doesNotExist = y;
});

assert(fs.existsSync(f));
assert(!fs.existsSync(f + '-NO'));

process.on('exit', function() {
  assert.strictEqual(exists, true);
  assert.strictEqual(doesNotExist, false);
});