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'use strict';
/*
* This test makes sure that `writeFile()` always writes from the current
* position of the file, instead of truncating the file, when used with file
* descriptors.
*/
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const join = require('path').join;
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
{
/* writeFileSync() test. */
const filename = join(tmpdir.path, 'test.txt');
/* Open the file descriptor. */
const fd = fs.openSync(filename, 'w');
/* Write only five characters, so that the position moves to five. */
assert.deepStrictEqual(fs.writeSync(fd, 'Hello'), 5);
assert.deepStrictEqual(fs.readFileSync(filename).toString(), 'Hello');
/* Write some more with writeFileSync(). */
fs.writeFileSync(fd, 'World');
/* New content should be written at position five, instead of zero. */
assert.deepStrictEqual(fs.readFileSync(filename).toString(), 'HelloWorld');
/* Close the file descriptor. */
fs.closeSync(fd);
}
{
/* writeFile() test. */
const file = join(tmpdir.path, 'test1.txt');
/* Open the file descriptor. */
fs.open(file, 'w', common.mustCall((err, fd) => {
assert.ifError(err);
/* Write only five characters, so that the position moves to five. */
fs.write(fd, 'Hello', common.mustCall((err, bytes) => {
assert.ifError(err);
assert.strictEqual(bytes, 5);
assert.deepStrictEqual(fs.readFileSync(file).toString(), 'Hello');
/* Write some more with writeFile(). */
fs.writeFile(fd, 'World', common.mustCall((err) => {
assert.ifError(err);
/* New content should be written at position five, instead of zero. */
assert.deepStrictEqual(fs.readFileSync(file).toString(), 'HelloWorld');
/* Close the file descriptor. */
fs.closeSync(fd);
}));
}));
}));
}
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