47   const dir = fs.opendirSync(testDir);  constant
49     const dirent = dir.readSync();
55   // dir.read should return null when no more entries exist
56   assert.strictEqual(dir.readSync(), null);
59   assert.strictEqual(dir.path, testDir);
61   dir.closeSync();
63   assert.throws(() => dir.readSync(), dirclosedError);
64   assert.throws(() => dir.closeSync(), dirclosedError);
68 fs.opendir(testDir, common.mustSucceed((dir) => {
70   dir.read(common.mustCall((err, dirent) => {
79     dir.read(common.mustCall((err, dirent) => {
83       dir.close(common.mustSucceed());
123   const dir = await fs.promises.opendir(testDir);
128     const dirent = await dir.read();
135   // dir.read should return null when no more entries exist
136   assert.strictEqual(await dir.read(), null);
138   await dir.close();
159   const dir = await fs.promises.opendir(testDir);
160   for await (const dirent of dir) { // eslint-disable-line no-unused-vars
164   await assert.rejects(async () => dir.read(), dirclosedError);
169   const dir = await fs.promises.opendir(testDir);
171     for await (const dirent of dir) { // eslint-disable-line no-unused-vars
176   await assert.rejects(async () => dir.read(), dirclosedError);
181   const dir = await fs.promises.opendir(testDir);
183     for await (const dirent of dir) { // eslint-disable-line no-unused-vars
192   await assert.rejects(async () => dir.read(), dirclosedError);
214   const dir = fs.opendirSync(testDir, { bufferSize: 1024 });  constant
215   assertDirent(dir.readSync());
216   dir.close();
221   const dir = await fs.promises.opendir(testDir);
222   assert.throws(() => dir.close('not function'), invalidCallbackObj);
228   const dir = await fs.promises.opendir(testDir);
229   await dir.close();
230   await assert.rejects(() => dir.close(), dirclosedError);
236   const dir = await fs.promises.opendir(testDir);
237   const promise = dir.read();
239   assert.throws(() => dir.closeSync(), dirconcurrentError);
240   assert.throws(() => dir.readSync(), dirconcurrentError);
243   dir.closeSync();
249   const dir = fs.opendirSync(testDir);  constant
250   assert.throws(() => dir.read('INVALID_CALLBACK'), /ERR_INVALID_CALLBACK/);
255   const dir = await fs.promises.opendir(testDir);
256   const promise1 = dir.read();
257   const promise2 = dir.read();
261   dir.closeSync();
267   const dir = await fs.promises.opendir(testDir);
268   const promise1 = dir.read();
269   const promise2 = dir.close();
278   const dir = fs.opendirSync(testDir);  constant
279   dir.closeSync();
280   dir.close(common.mustCall((error) => {
287   const dir = fs.opendirSync(testDir);  constant
288   dir.closeSync();
289   assert.rejects(dir.close(), dirclosedError).then(common.mustCall());