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test-fs-read-optional-params.js
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test-fs-read-optional-params.js
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'use strict';
const common = require('../common');
const fixtures = require('../common/fixtures');
const fs = require('fs');
const assert = require('assert');
const filepath = fixtures.path('x.txt');
const fd = fs.openSync(filepath, 'r');
const expected = Buffer.from('xyz\n');
const defaultBufferAsync = Buffer.alloc(16384);
const bufferAsOption = Buffer.allocUnsafe(expected.length);
// Test passing in an empty options object
fs.read(fd, { position: 0 }, common.mustCall((err, bytesRead, buffer) => {
assert.strictEqual(bytesRead, expected.length);
assert.deepStrictEqual(defaultBufferAsync.length, buffer.length);
}));
// Test not passing in any options object
fs.read(fd, common.mustCall((err, bytesRead, buffer) => {
assert.strictEqual(bytesRead, expected.length);
assert.deepStrictEqual(defaultBufferAsync.length, buffer.length);
}));
// Test passing in options
fs.read(fd, {
buffer: bufferAsOption,
offset: 0,
length: bufferAsOption.length,
position: 0
},
common.mustCall((err, bytesRead, buffer) => {
assert.strictEqual(bytesRead, expected.length);
assert.deepStrictEqual(bufferAsOption.length, buffer.length);
}));