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| Current File : //proc/self/root/proc/self/root/home/ubuntu/node-v16.18.1/test/parallel/test-stream-promises.js |
'use strict';
const common = require('../common');
const stream = require('stream');
const {
Readable,
Writable,
promises,
} = stream;
const {
finished,
pipeline,
} = require('stream/promises');
const fs = require('fs');
const assert = require('assert');
const { promisify } = require('util');
assert.strictEqual(promises.pipeline, pipeline);
assert.strictEqual(promises.finished, finished);
assert.strictEqual(pipeline, promisify(stream.pipeline));
assert.strictEqual(finished, promisify(stream.finished));
// pipeline success
{
let finished = false;
const processed = [];
const expected = [
Buffer.from('a'),
Buffer.from('b'),
Buffer.from('c'),
];
const read = new Readable({
read() { }
});
const write = new Writable({
write(data, enc, cb) {
processed.push(data);
cb();
}
});
write.on('finish', () => {
finished = true;
});
for (let i = 0; i < expected.length; i++) {
read.push(expected[i]);
}
read.push(null);
pipeline(read, write).then(common.mustCall((value) => {
assert.ok(finished);
assert.deepStrictEqual(processed, expected);
}));
}
// pipeline error
{
const read = new Readable({
read() { }
});
const write = new Writable({
write(data, enc, cb) {
cb();
}
});
read.push('data');
setImmediate(() => read.destroy());
pipeline(read, write).catch(common.mustCall((err) => {
assert.ok(err, 'should have an error');
}));
}
// finished success
{
async function run() {
const rs = fs.createReadStream(__filename);
let ended = false;
rs.resume();
rs.on('end', () => {
ended = true;
});
await finished(rs);
assert(ended);
}
run().then(common.mustCall());
}
// finished error
{
const rs = fs.createReadStream('file-does-not-exist');
assert.rejects(finished(rs), {
code: 'ENOENT'
}).then(common.mustCall());
}
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