8ef68e66d0
PR-URL: https://github.com/nodejs/node/pull/28858 Reviewed-By: Rich Trott <rtrott@gmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
39 lines
1020 B
JavaScript
39 lines
1020 B
JavaScript
'use strict';
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/*
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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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*/
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const common = require('../common');
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const assert = require('assert');
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const path = require('path');
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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 = path.join(tmpdir.path, '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.deepStrictEqual(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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