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1// Flags: --expose-gc --no-warnings
2'use strict';
3
4// Test that a runtime warning is emitted when a FileHandle object
5// is allowed to close on garbage collection. In the future, this
6// test should verify that closing on garbage collection throws a
7// process fatal exception.
8
9const common = require('../common');
10const assert = require('assert');
11const { promises: fs } = require('fs');
12
13const warning =
14  'Closing a FileHandle object on garbage collection is deprecated. ' +
15  'Please close FileHandle objects explicitly using ' +
16  'FileHandle.prototype.close(). In the future, an error will be ' +
17  'thrown if a file descriptor is closed during garbage collection.';
18
19async function doOpen() {
20  const fh = await fs.open(__filename);
21
22  common.expectWarning({
23    Warning: [[`Closing file descriptor ${fh.fd} on garbage collection`]],
24    DeprecationWarning: [[warning, 'DEP0137']]
25  });
26
27  return fh;
28}
29
30doOpen().then(common.mustCall((fd) => {
31  assert.strictEqual(typeof fd, 'object');
32})).then(common.mustCall(() => {
33  setImmediate(() => {
34    // The FileHandle should be out-of-scope and no longer accessed now.
35    global.gc();
36
37    // Wait an extra event loop turn, as the warning is emitted from the
38    // native layer in an unref()'ed setImmediate() callback.
39    setImmediate(common.mustCall());
40  });
41}));
42