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test-fs-readSync-optional-params.js
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test-fs-readSync-optional-params.js
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'use strict';
require('../common');
const fixtures = require('../common/fixtures');
const fs = require('fs');
const assert = require('assert');
const filepath = fixtures.path('x.txt');
const expected = Buffer.from('xyz\n');
function runTest(defaultBuffer, options) {
let fd;
try {
fd = fs.openSync(filepath, 'r');
const result = fs.readSync(fd, defaultBuffer, options);
assert.strictEqual(result, expected.length);
assert.deepStrictEqual(defaultBuffer, expected);
} finally {
if (fd != null) fs.closeSync(fd);
}
}
for (const options of [
// Test options object
{ offset: 0 },
{ length: expected.length },
{ position: 0 },
{ offset: 0, length: expected.length },
{ offset: 0, position: 0 },
{ length: expected.length, position: 0 },
{ offset: 0, length: expected.length, position: 0 },
{ offset: null },
{ position: null },
{ position: -1 },
{ position: 0n },
// Test default params
{},
null,
undefined,
// Test if bad params are interpreted as default (not mandatory)
false,
true,
Infinity,
42n,
Symbol(),
// Test even more malicious corner cases
'4'.repeat(expected.length),
new String('4444'),
[4, 4, 4, 4],
]) {
runTest(Buffer.allocUnsafe(expected.length), options);
}