1 files changed, 112 insertions, 0 deletions
diff --git a/tests/node_compat/test/parallel/test-fs-watchfile.js b/tests/node_compat/test/parallel/test-fs-watchfile.js
new file mode 100644
index 000000000..3a77fb56d
--- /dev/null
+++ b/tests/node_compat/test/parallel/test-fs-watchfile.js
@@ -0,0 +1,112 @@
+// deno-fmt-ignore-file
+// deno-lint-ignore-file
+
+// Copyright Joyent and Node contributors. All rights reserved. MIT license.
+// Taken from Node 18.12.1
+// This file is automatically generated by `tools/node_compat/setup.ts`. Do not modify this file manually.
+
+'use strict';
+const common = require('../common');
+
+const assert = require('assert');
+const fs = require('fs');
+const path = require('path');
+
+const tmpdir = require('../common/tmpdir');
+
+// Basic usage tests.
+assert.throws(
+  () => {
+    fs.watchFile('./some-file');
+  },
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    name: 'TypeError'
+  });
+
+assert.throws(
+  () => {
+    fs.watchFile('./another-file', {}, 'bad listener');
+  },
+  {
+    code: 'ERR_INVALID_ARG_TYPE',
+    name: 'TypeError'
+  });
+
+assert.throws(() => {
+  fs.watchFile(new Object(), common.mustNotCall());
+}, { code: 'ERR_INVALID_ARG_TYPE', name: 'TypeError' });
+
+const enoentFile = path.join(tmpdir.path, 'non-existent-file');
+const expectedStatObject = new fs.Stats(
+  0,                                        // dev
+  0,                                        // mode
+  0,                                        // nlink
+  0,                                        // uid
+  0,                                        // gid
+  0,                                        // rdev
+  0,                                        // blksize
+  0,                                        // ino
+  0,                                        // size
+  0,                                        // blocks
+  Date.UTC(1970, 0, 1, 0, 0, 0),            // atime
+  Date.UTC(1970, 0, 1, 0, 0, 0),            // mtime
+  Date.UTC(1970, 0, 1, 0, 0, 0),            // ctime
+  Date.UTC(1970, 0, 1, 0, 0, 0)             // birthtime
+);
+
+tmpdir.refresh();
+
+// If the file initially didn't exist, and gets created at a later point of
+// time, the callback should be invoked again with proper values in stat object
+let fileExists = false;
+
+const watcher =
+  fs.watchFile(enoentFile, { interval: 0 }, common.mustCall((curr, prev) => {
+    if (!fileExists) {
+      // If the file does not exist, all the fields should be zero and the date
+      // fields should be UNIX EPOCH time
+      assert.deepStrictEqual(curr, expectedStatObject);
+      assert.deepStrictEqual(prev, expectedStatObject);
+      // Create the file now, so that the callback will be called back once the
+      // event loop notices it.
+      fs.closeSync(fs.openSync(enoentFile, 'w'));
+      fileExists = true;
+    } else {
+      // If the ino (inode) value is greater than zero, it means that the file
+      // is present in the filesystem and it has a valid inode number.
+      assert(curr.ino > 0);
+      // As the file just got created, previous ino value should be lesser than
+      // or equal to zero (non-existent file).
+      assert(prev.ino <= 0);
+      // Stop watching the file
+      fs.unwatchFile(enoentFile);
+      watcher.stop();  // Stopping a stopped watcher should be a noop
+    }
+  }, 2));
+
+// 'stop' should only be emitted once - stopping a stopped watcher should
+// not trigger a 'stop' event.
+watcher.on('stop', common.mustCall());
+
+// Watch events should callback with a filename on supported systems.
+// Omitting AIX. It works but not reliably.
+if (common.isLinux || common.isOSX || common.isWindows) {
+  const dir = path.join(tmpdir.path, 'watch');
+
+  fs.mkdir(dir, common.mustCall(function(err) {
+    if (err) assert.fail(err);
+
+    fs.watch(dir, common.mustCall(function(eventType, filename) {
+      clearInterval(interval);
+      this._handle.close();
+      assert.strictEqual(filename, 'foo.txt');
+    }));
+
+    const interval = setInterval(() => {
+      fs.writeFile(path.join(dir, 'foo.txt'), 'foo', common.mustCall((err) => {
+        if (err) assert.fail(err);
+      }));
+    }, 1);
+  }));
+}