/
test-fs-read-offset-null.js
43 lines (35 loc) · 1.26 KB
/
test-fs-read-offset-null.js
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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
// Test 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);
// Test is done by making sure the first letter in buffer is
// same as first letter in file.
// 66 is the hex for ascii code of letter B
fs.close(fd, common.mustSucceed(() => {}));
}));
}));
let filehandle = null;
// Test for promise api
(async () => {
filehandle = await fsPromises.open(filepath, 'r');
const readObject = await filehandle.read(buf, null, buf.length);
assert.strictEqual(readObject.buffer[0], 120);
})()
.then(common.mustCall())
.finally(async () => {
// Close the file handle if it is opened
if (filehandle)
await filehandle.close();
});