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test-fs-readfile-flags.js
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test-fs-readfile-flags.js
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'use strict';
// Test of fs.readFile with different flags.
const common = require('../common');
const fs = require('fs');
const assert = require('assert');
const path = require('path');
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
{
const emptyFile = path.join(tmpdir.path, 'empty.txt');
fs.closeSync(fs.openSync(emptyFile, 'w'));
fs.readFile(
emptyFile,
// With `a+` the file is created if it does not exist
{ encoding: 'utf8', flag: 'a+' },
common.mustCall((err, data) => { assert.strictEqual(data, ''); })
);
fs.readFile(
emptyFile,
// Like `a+` but fails if the path exists.
{ encoding: 'utf8', flag: 'ax+' },
common.mustCall((err, data) => { assert.strictEqual(err.code, 'EEXIST'); })
);
}
{
const willBeCreated = path.join(tmpdir.path, 'will-be-created');
fs.readFile(
willBeCreated,
// With `a+` the file is created if it does not exist
{ encoding: 'utf8', flag: 'a+' },
common.mustCall((err, data) => { assert.strictEqual(data, ''); })
);
}
{
const willNotBeCreated = path.join(tmpdir.path, 'will-not-be-created');
fs.readFile(
willNotBeCreated,
// Default flag is `r`. An exception occurs if the file does not exist.
{ encoding: 'utf8' },
common.mustCall((err, data) => { assert.strictEqual(err.code, 'ENOENT'); })
);
}