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'use strict';
// Test to assert the desired functioning of fs.read
// when {offset:null} is passed as options parameter
const common = require('../common');
const assert = require('assert');
const fs = require('fs');
const fsPromises = fs.promises;
const fixtures = require('../common/fixtures');
const filepath = fixtures.path('x.txt');
const buf = Buffer.alloc(1);
// Reading only one character, hence buffer of one byte is enough.
// Tests are done by making sure the first letter in buffer is
// same as first letter in file.
// 120 is the ascii code of letter x.
// Tests for callback API.
fs.open(filepath, 'r', common.mustSucceed((fd) => {
fs.read(fd, { offset: null, buffer: buf },
common.mustSucceed((bytesRead, buffer) => {
assert.strictEqual(buffer[0], 120);
fs.close(fd, common.mustSucceed(() => {}));
}));
}));
fs.open(filepath, 'r', common.mustSucceed((fd) => {
fs.read(fd, buf, { offset: null },
common.mustSucceed((bytesRead, buffer) => {
assert.strictEqual(buffer[0], 120);
fs.close(fd, common.mustSucceed(() => {}));
}));
}));
let filehandle = null;
// Tests for promises api
(async () => {
filehandle = await fsPromises.open(filepath, 'r');
const readObject = await filehandle.read(buf, { offset: null });
assert.strictEqual(readObject.buffer[0], 120);
})()
.finally(() => filehandle?.close())
.then(common.mustCall());
// Undocumented: omitted position works the same as position === null
(async () => {
filehandle = await fsPromises.open(filepath, 'r');
const readObject = await filehandle.read(buf, null, buf.length);
assert.strictEqual(readObject.buffer[0], 120);
})()
.finally(() => filehandle?.close())
.then(common.mustCall());
(async () => {
filehandle = await fsPromises.open(filepath, 'r');
const readObject = await filehandle.read(buf, null, buf.length, 0);
assert.strictEqual(readObject.buffer[0], 120);
})()
.finally(() => filehandle?.close())
.then(common.mustCall());
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