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43 lines
1.2 KiB
JavaScript
43 lines
1.2 KiB
JavaScript
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// deno-fmt-ignore-file
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// deno-lint-ignore-file
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// Copyright Joyent and Node contributors. All rights reserved. MIT license.
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// Taken from Node 18.12.1
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// This file is automatically generated by `tests/node_compat/runner/setup.ts`. Do not modify this file manually.
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'use strict';
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// This test makes sure that `writeFile()` always writes from the current
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// position of the file, instead of truncating the file.
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const common = require('../common');
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const assert = require('assert');
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const { readFileSync } = require('fs');
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const { open } = require('fs').promises;
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const tmpdir = require('../common/tmpdir');
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tmpdir.refresh();
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const fn = tmpdir.resolve('test.txt');
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async function writeFileTest() {
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const handle = await open(fn, 'w');
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/* Write only five bytes, so that the position moves to five. */
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const buf = Buffer.from('Hello');
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const { bytesWritten } = await handle.write(buf, 0, 5, null);
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assert.strictEqual(bytesWritten, 5);
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/* Write some more with writeFile(). */
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await handle.writeFile('World');
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/* New content should be written at position five, instead of zero. */
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assert.strictEqual(readFileSync(fn).toString(), 'HelloWorld');
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await handle.close();
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}
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writeFileTest()
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.then(common.mustCall());
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