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

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+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const { open, readFile } = require('fs').promises;
+const tmpdir = require('../common/tmpdir');
+
+tmpdir.refresh();
+
+async function validateTruncate() {
+  const text = 'Hello world';
+  const filename = tmpdir.resolve('truncate-file.txt');
+  const fileHandle = await open(filename, 'w+');
+
+  const buffer = Buffer.from(text, 'utf8');
+  await fileHandle.write(buffer, 0, buffer.length);
+
+  assert.strictEqual((await readFile(filename)).toString(), text);
+
+  await fileHandle.truncate(5);
+  assert.strictEqual((await readFile(filename)).toString(), 'Hello');
+
+  await fileHandle.close();
+}
+
+validateTruncate().then(common.mustCall());