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denoland-deno/tests/node_compat/test/parallel/test-readline-async-iterators.js

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// deno-fmt-ignore-file
// deno-lint-ignore-file
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// Taken from Node 20.11.1
// This file is automatically generated by `tests/node_compat/runner/setup.ts`. Do not modify this file manually.
'use strict';
const common = require('../common');
const fs = require('fs');
const readline = require('readline');
const { Readable } = require('stream');
const assert = require('assert');
const tmpdir = require('../common/tmpdir');
tmpdir.refresh();
const filename = tmpdir.resolve('test.txt');
const testContents = [
'',
'\n',
'line 1',
'line 1\nline 2 南越国是前203年至前111年存在于岭南地区的一个国家\nline 3\ntrailing',
'line 1\nline 2\nline 3 ends with newline\n',
];
async function testSimple() {
for (const fileContent of testContents) {
fs.writeFileSync(filename, fileContent);
const readable = fs.createReadStream(filename);
const rli = readline.createInterface({
input: readable,
crlfDelay: Infinity
});
const iteratedLines = [];
for await (const k of rli) {
iteratedLines.push(k);
}
const expectedLines = fileContent.split('\n');
if (expectedLines[expectedLines.length - 1] === '') {
expectedLines.pop();
}
assert.deepStrictEqual(iteratedLines, expectedLines);
assert.strictEqual(iteratedLines.join(''), fileContent.replace(/\n/g, ''));
}
}
async function testMutual() {
for (const fileContent of testContents) {
fs.writeFileSync(filename, fileContent);
const readable = fs.createReadStream(filename);
const rli = readline.createInterface({
input: readable,
crlfDelay: Infinity
});
const expectedLines = fileContent.split('\n');
if (expectedLines[expectedLines.length - 1] === '') {
expectedLines.pop();
}
const iteratedLines = [];
let iterated = false;
for await (const k of rli) {
// This outer loop should only iterate once.
assert.strictEqual(iterated, false);
iterated = true;
iteratedLines.push(k);
for await (const l of rli) {
iteratedLines.push(l);
}
assert.deepStrictEqual(iteratedLines, expectedLines);
}
assert.deepStrictEqual(iteratedLines, expectedLines);
}
}
async function testSlowStreamForLeaks() {
const message = 'a\nb\nc\n';
const DELAY = 1;
const REPETITIONS = 100;
const warningCallback = common.mustNotCall();
process.on('warning', warningCallback);
function getStream() {
const readable = Readable({
objectMode: true,
});
readable._read = () => {};
let i = REPETITIONS;
function schedule() {
setTimeout(() => {
i--;
if (i < 0) {
readable.push(null);
} else {
readable.push(message);
schedule();
}
}, DELAY);
}
schedule();
return readable;
}
const iterable = readline.createInterface({
input: getStream(),
});
let lines = 0;
// eslint-disable-next-line no-unused-vars
for await (const _ of iterable) {
lines++;
}
assert.strictEqual(lines, 3 * REPETITIONS);
process.off('warning', warningCallback);
}
testSimple()
.then(testMutual)
.then(testSlowStreamForLeaks)
.then(common.mustCall());