test: increase fs promise coverage

1. Signal aborted while writing file
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L278

2. Signal aborted on first tick
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L301

3. Validate file size is withing range for reading
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L312

4. Signal aborted right before buffer read
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L321

5. Use fallback buffer allocation when input not buffer
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L374

6. Specify symlink type
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L539

7. Set modification times with lutimes
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L635

8. Use fallback encoding when input is null
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L665

9. Use fallback flag when input is null
Refs: https://coverage.nodejs.org/coverage-0b6d3070a176d437/lib/internal/fs/promises.js.html#L681

PR-URL: #36813
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/parallel/test-fs-promises-file-handle-readFile.js

@@ -1,3 +1,4 @@
+// Flags: --experimental-abortcontroller
 'use strict';
 
 const common = require('../common');
@@ -6,9 +7,15 @@ const common = require('../common');
 // FileHandle.readFile method.
 
 const fs = require('fs');
-const { open } = fs.promises;
+const {
+  open,
+  readFile,
+  writeFile,
+  truncate
+} = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
+const tick = require('../common/tick');
 const assert = require('assert');
 const tmpDir = tmpdir.path;
 
@@ -45,6 +52,70 @@ async function validateReadFileProc() {
   assert.ok(hostname.length > 0);
 }
 
+async function doReadAndCancel() {
+  // Signal aborted from the start
+  {
+    const filePathForHandle = path.resolve(tmpDir, 'dogs-running.txt');
+    const fileHandle = await open(filePathForHandle, 'w+');
+    const buffer = Buffer.from('Dogs running'.repeat(10000), 'utf8');
+    fs.writeFileSync(filePathForHandle, buffer);
+    const controller = new AbortController();
+    const { signal } = controller;
+    controller.abort();
+    await assert.rejects(readFile(fileHandle, { signal }), {
+      name: 'AbortError'
+    });
+  }
+
+  // Signal aborted on first tick
+  {
+    const filePathForHandle = path.resolve(tmpDir, 'dogs-running1.txt');
+    const fileHandle = await open(filePathForHandle, 'w+');
+    const buffer = Buffer.from('Dogs running'.repeat(10000), 'utf8');
+    fs.writeFileSync(filePathForHandle, buffer);
+    const controller = new AbortController();
+    const { signal } = controller;
+    tick(1, () => controller.abort());
+    await assert.rejects(readFile(fileHandle, { signal }), {
+      name: 'AbortError'
+    });
+  }
+
+  // Signal aborted right before buffer read
+  {
+    const newFile = path.resolve(tmpDir, 'dogs-running2.txt');
+    const buffer = Buffer.from('Dogs running'.repeat(1000), 'utf8');
+    fs.writeFileSync(newFile, buffer);
+
+    const fileHandle = await open(newFile, 'r');
+
+    const controller = new AbortController();
+    const { signal } = controller;
+    tick(2, () => controller.abort());
+    await assert.rejects(fileHandle.readFile({ signal, encoding: 'utf8' }), {
+      name: 'AbortError'
+    });
+  }
+
+  // Validate file size is within range for reading
+  {
+    // Variable taken from https://github.com/nodejs/node/blob/master/lib/internal/fs/promises.js#L5
+    const kIoMaxLength = 2 ** 31 - 1;
+
+    const newFile = path.resolve(tmpDir, 'dogs-running3.txt');
+    await writeFile(newFile, Buffer.from('0'));
+    await truncate(newFile, kIoMaxLength + 1);
+
+    const fileHandle = await open(newFile, 'r');
+
+    await assert.rejects(fileHandle.readFile(), {
+      name: 'RangeError',
+      code: 'ERR_FS_FILE_TOO_LARGE'
+    });
+  }
+}
+
 validateReadFile()
-  .then(() => validateReadFileProc())
+  .then(validateReadFileProc)
+  .then(doReadAndCancel)
   .then(common.mustCall());

test/parallel/test-fs-promises-file-handle-writeFile.js

@@ -1,12 +1,13 @@
+// Flags: --experimental-abortcontroller
 'use strict';
 
 const common = require('../common');
 
 // The following tests validate base functionality for the fs.promises
-// FileHandle.readFile method.
+// FileHandle.writeFile method.
 
 const fs = require('fs');
-const { open } = fs.promises;
+const { open, writeFile } = fs.promises;
 const path = require('path');
 const tmpdir = require('../common/tmpdir');
 const assert = require('assert');
@@ -26,5 +27,19 @@ async function validateWriteFile() {
   await fileHandle.close();
 }
 
+// Signal aborted while writing file
+async function doWriteAndCancel() {
+  const filePathForHandle = path.resolve(tmpDir, 'dogs-running.txt');
+  const fileHandle = await open(filePathForHandle, 'w+');
+  const buffer = Buffer.from('dogs running'.repeat(10000), 'utf8');
+  const controller = new AbortController();
+  const { signal } = controller;
+  process.nextTick(() => controller.abort());
+  await assert.rejects(writeFile(fileHandle, buffer, { signal }), {
+    name: 'AbortError'
+  });
+}
+
 validateWriteFile()
+  .then(doWriteAndCancel)
   .then(common.mustCall());

test/parallel/test-fs-promises-writefile.js

@@ -32,7 +32,7 @@ async function doWriteWithCancel() {
 }
 
 async function doAppend() {
-  await fsPromises.appendFile(dest, buffer2);
+  await fsPromises.appendFile(dest, buffer2, { flag: null });
   const data = fs.readFileSync(dest);
   const buf = Buffer.concat([buffer, buffer2]);
   assert.deepStrictEqual(buf, data);

test/parallel/test-fs-promises.js

@@ -16,6 +16,7 @@ const {
   link,
   lchmod,
   lstat,
+  lutimes,
   mkdir,
   mkdtemp,
   open,
@@ -140,6 +141,13 @@ async function getHandle(dest) {
       await handle.close();
     }
 
+    // Use fallback buffer allocation when input not buffer
+    {
+      const handle = await getHandle(dest);
+      const ret = await handle.read(0, 0, 0, 0);
+      assert.strictEqual(ret.buffer.length, 16384);
+    }
+
     // Bytes written to file match buffer
     {
       const handle = await getHandle(dest);
@@ -226,6 +234,19 @@ async function getHandle(dest) {
       await handle.close();
     }
 
+    // Set modification times with lutimes
+    {
+      const a_time = new Date();
+      a_time.setMinutes(a_time.getMinutes() - 1);
+      const m_time = new Date();
+      m_time.setHours(m_time.getHours() - 1);
+      await lutimes(dest, a_time, m_time);
+      const stats = await stat(dest);
+
+      assert.strictEqual(a_time.toString(), stats.atime.toString());
+      assert.strictEqual(m_time.toString(), stats.mtime.toString());
+    }
+
     // create symlink
     {
       const newPath = path.resolve(tmpDir, 'baz2.js');
@@ -270,6 +291,15 @@ async function getHandle(dest) {
       }
     }
 
+    // specify symlink type
+    {
+      const dir = path.join(tmpDir, nextdir());
+      await symlink(tmpDir, dir, 'dir');
+      const stats = await lstat(dir);
+      assert.strictEqual(stats.isSymbolicLink(), true);
+      await unlink(dir);
+    }
+
     // create hard link
     {
       const newPath = path.resolve(tmpDir, 'baz2.js');
@@ -296,6 +326,14 @@ async function getHandle(dest) {
       await unlink(newFile);
     }
 
+    // Use fallback encoding when input is null
+    {
+      const newFile = path.resolve(tmpDir, 'dogs_running.js');
+      await writeFile(newFile, 'dogs running', { encoding: null });
+      const fileExists = fs.existsSync(newFile);
+      assert.strictEqual(fileExists, true);
+    }
+
     // `mkdir` when options is number.
     {
       const dir = path.join(tmpDir, nextdir());