test/parallel/test-stream-pipe-unpipe-streams.js


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'use strict';
const common = require('../common');
const assert = require('assert');

const { Readable, Writable } = require('stream');

const source = Readable({ read: () => {} });
const dest1 = Writable({ write: () => {} });
const dest2 = Writable({ write: () => {} });

source.pipe(dest1);
source.pipe(dest2);

dest1.on('unpipe', common.mustCall());
dest2.on('unpipe', common.mustCall());

assert.strictEqual(source._readableState.pipes[0], dest1);
assert.strictEqual(source._readableState.pipes[1], dest2);
assert.strictEqual(source._readableState.pipes.length, 2);

// Should be able to unpipe them in the reverse order that they were piped.

source.unpipe(dest2);

assert.strictEqual(source._readableState.pipes, dest1);
assert.notStrictEqual(source._readableState.pipes, dest2);

dest2.on('unpipe', common.mustNotCall());
source.unpipe(dest2);

source.unpipe(dest1);

assert.strictEqual(source._readableState.pipes, null);