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87 lines
3.1 KiB
87 lines
3.1 KiB
'use strict';
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const common = require('../common');
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const assert = require('assert');
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const fs = require('fs');
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const path = require('path');
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// Basic usage tests.
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assert.throws(function() {
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fs.watchFile('./some-file');
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}, /^Error: "watchFile\(\)" requires a listener function$/);
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assert.throws(function() {
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fs.watchFile('./another-file', {}, 'bad listener');
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}, /^Error: "watchFile\(\)" requires a listener function$/);
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assert.throws(function() {
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fs.watchFile(new Object(), common.mustNotCall());
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}, common.expectsError({ code: 'ERR_INVALID_ARG_TYPE', type: TypeError }));
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const enoentFile = path.join(common.tmpDir, 'non-existent-file');
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const expectedStatObject = new fs.Stats(
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0, // dev
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0, // mode
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0, // nlink
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0, // uid
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0, // gid
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0, // rdev
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common.isWindows ? undefined : 0, // blksize
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0, // ino
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0, // size
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common.isWindows ? undefined : 0, // blocks
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Date.UTC(1970, 0, 1, 0, 0, 0), // atime
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Date.UTC(1970, 0, 1, 0, 0, 0), // mtime
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Date.UTC(1970, 0, 1, 0, 0, 0), // ctime
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Date.UTC(1970, 0, 1, 0, 0, 0) // birthtime
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);
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common.refreshTmpDir();
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// If the file initially didn't exist, and gets created at a later point of
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// time, the callback should be invoked again with proper values in stat object
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let fileExists = false;
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fs.watchFile(enoentFile, { interval: 0 }, common.mustCall(function(curr, prev) {
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if (!fileExists) {
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// If the file does not exist, all the fields should be zero and the date
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// fields should be UNIX EPOCH time
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assert.deepStrictEqual(curr, expectedStatObject);
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assert.deepStrictEqual(prev, expectedStatObject);
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// Create the file now, so that the callback will be called back once the
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// event loop notices it.
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fs.closeSync(fs.openSync(enoentFile, 'w'));
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fileExists = true;
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} else {
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// If the ino (inode) value is greater than zero, it means that the file is
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// present in the filesystem and it has a valid inode number.
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assert(curr.ino > 0);
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// As the file just got created, previous ino value should be lesser than
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// or equal to zero (non-existent file).
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assert(prev.ino <= 0);
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// Stop watching the file
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fs.unwatchFile(enoentFile);
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}
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}, 2));
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// Watch events should callback with a filename on supported systems.
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// Omitting AIX. It works but not reliably.
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if (common.isLinux || common.isOSX || common.isWindows) {
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const dir = path.join(common.tmpDir, 'watch');
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fs.mkdir(dir, common.mustCall(function(err) {
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if (err) assert.fail(err);
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fs.watch(dir, common.mustCall(function(eventType, filename) {
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clearInterval(interval);
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this._handle.close();
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assert.strictEqual(filename, 'foo.txt');
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}));
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const interval = setInterval(() => {
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fs.writeFile(path.join(dir, 'foo.txt'), 'foo', common.mustCall((err) => {
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if (err) assert.fail(err);
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}));
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}, 1);
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}));
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}
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