test: add tests for fs/promises.js fileHandle methods

Working to increase test code coverage for fs/promises.js.
Added tests for fileHandle.appendFile and fileHandle.chmod.

PR-URL: https://github.com/nodejs/node/pull/19605
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/test/parallel/test-fs-promises-file-handle-append-file.js b/test/parallel/test-fs-promises-file-handle-append-file.js
new file mode 100644
index 0000000000..38336a2b43
--- /dev/null
+++ b/test/parallel/test-fs-promises-file-handle-append-file.js
@@ -0,0 +1,41 @@
+'use strict';
+
+const common = require('../common');
+
+// The following tests validate base functionality for the fs/promises
+// FileHandle.appendFile method.
+
+const fs = require('fs');
+const { open } = require('fs/promises');
+const path = require('path');
+const tmpdir = require('../common/tmpdir');
+const assert = require('assert');
+const tmpDir = tmpdir.path;
+
+tmpdir.refresh();
+common.crashOnUnhandledRejection();
+
+async function validateAppendBuffer() {
+  const filePath = path.resolve(tmpDir, 'tmp-append-file-buffer.txt');
+  const fileHandle = await open(filePath, 'a');
+  const buffer = Buffer.from('a&Dp'.repeat(100), 'utf8');
+
+  await fileHandle.appendFile(buffer);
+  const appendedFileData = fs.readFileSync(filePath);
+  assert.deepStrictEqual(appendedFileData, buffer);
+}
+
+async function validateAppendString() {
+  const filePath = path.resolve(tmpDir, 'tmp-append-file-string.txt');
+  const fileHandle = await open(filePath, 'a');
+  const string = 'x~yz'.repeat(100);
+
+  await fileHandle.appendFile(string);
+  const stringAsBuffer = Buffer.from(string, 'utf8');
+  const appendedFileData = fs.readFileSync(filePath);
+  assert.deepStrictEqual(appendedFileData, stringAsBuffer);
+}
+
+validateAppendBuffer()
+  .then(validateAppendString)
+  .then(common.mustCall());