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'use strict'; const { mustNotMutateObjectDeep } = 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), mustNotMutateObjectDeep(options)); }