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test-stream-duplex-from.js
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test-stream-duplex-from.js
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'use strict';
const common = require('../common');
const assert = require('assert');
const { Duplex, Readable, Writable, pipeline } = require('stream');
{
const d = Duplex.from({
readable: new Readable({
read() {
this.push('asd');
this.push(null);
}
})
});
assert.strictEqual(d.readable, true);
assert.strictEqual(d.writable, false);
d.once('readable', common.mustCall(function() {
assert.strictEqual(d.read().toString(), 'asd');
}));
d.once('end', common.mustCall(function() {
assert.strictEqual(d.readable, false);
}));
}
{
const d = Duplex.from(new Readable({
read() {
this.push('asd');
this.push(null);
}
}));
assert.strictEqual(d.readable, true);
assert.strictEqual(d.writable, false);
d.once('readable', common.mustCall(function() {
assert.strictEqual(d.read().toString(), 'asd');
}));
d.once('end', common.mustCall(function() {
assert.strictEqual(d.readable, false);
}));
}
{
let ret = '';
const d = Duplex.from(new Writable({
write(chunk, encoding, callback) {
ret += chunk;
callback();
}
}));
assert.strictEqual(d.readable, false);
assert.strictEqual(d.writable, true);
d.end('asd');
d.on('finish', common.mustCall(function() {
assert.strictEqual(d.writable, false);
assert.strictEqual(ret, 'asd');
}));
}
{
let ret = '';
const d = Duplex.from({
writable: new Writable({
write(chunk, encoding, callback) {
ret += chunk;
callback();
}
})
});
assert.strictEqual(d.readable, false);
assert.strictEqual(d.writable, true);
d.end('asd');
d.on('finish', common.mustCall(function() {
assert.strictEqual(d.writable, false);
assert.strictEqual(ret, 'asd');
}));
}
{
let ret = '';
const d = Duplex.from({
readable: new Readable({
read() {
this.push('asd');
this.push(null);
}
}),
writable: new Writable({
write(chunk, encoding, callback) {
ret += chunk;
callback();
}
})
});
assert.strictEqual(d.readable, true);
assert.strictEqual(d.writable, true);
d.once('readable', common.mustCall(function() {
assert.strictEqual(d.read().toString(), 'asd');
}));
d.once('end', common.mustCall(function() {
assert.strictEqual(d.readable, false);
}));
d.end('asd');
d.once('finish', common.mustCall(function() {
assert.strictEqual(d.writable, false);
assert.strictEqual(ret, 'asd');
}));
}
{
const d = Duplex.from(Promise.resolve('asd'));
assert.strictEqual(d.readable, true);
assert.strictEqual(d.writable, false);
d.once('readable', common.mustCall(function() {
assert.strictEqual(d.read().toString(), 'asd');
}));
d.once('end', common.mustCall(function() {
assert.strictEqual(d.readable, false);
}));
}
{
// https://github.com/nodejs/node/issues/40497
pipeline(
['abc\ndef\nghi'],
Duplex.from(async function * (source) {
let rest = '';
for await (const chunk of source) {
const lines = (rest + chunk.toString()).split('\n');
rest = lines.pop();
for (const line of lines) {
yield line;
}
}
yield rest;
}),
async function * (source) { // eslint-disable-line require-yield
let ret = '';
for await (const x of source) {
ret += x;
}
assert.strictEqual(ret, 'abcdefghi');
},
common.mustCall(() => {}),
);
}