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| Current File : //proc/self/root/home/ubuntu/node-v16.18.1/test/parallel/test-fs-readfile-flags.js |
'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
common.mustNotMutateObjectDeep({ encoding: 'utf8', flag: 'a+' }),
common.mustCall((err, data) => { assert.strictEqual(data, ''); })
);
fs.readFile(
emptyFile,
// Like `a+` but fails if the path exists.
common.mustNotMutateObjectDeep({ 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
common.mustNotMutateObjectDeep({ 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.
common.mustNotMutateObjectDeep({ encoding: 'utf8' }),
common.mustCall((err, data) => { assert.strictEqual(err.code, 'ENOENT'); })
);
}
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