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'use strict';
const common = require('../common');
// Regression test for https://github.com/nodejs/node/issues/12718.
// Tests that piping a source stream twice to the same destination stream
// works, and that a subsequent unpipe() call only removes the pipe *once*.
const assert = require('assert');
const { PassThrough, Writable } = require('stream');
{
const passThrough = new PassThrough();
const dest = new Writable({
write: common.mustCall((chunk, encoding, cb) => {
assert.strictEqual(`${chunk}`, 'foobar');
cb();
})
});
passThrough.pipe(dest);
passThrough.pipe(dest);
assert.strictEqual(passThrough._events.data.length, 2);
assert.strictEqual(passThrough._readableState.pipes.length, 2);
assert.strictEqual(passThrough._readableState.pipes[0], dest);
assert.strictEqual(passThrough._readableState.pipes[1], dest);
passThrough.unpipe(dest);
assert.strictEqual(passThrough._events.data.length, 1);
assert.strictEqual(passThrough._readableState.pipes.length, 1);
assert.deepStrictEqual(passThrough._readableState.pipes, [dest]);
passThrough.write('foobar');
passThrough.pipe(dest);
}
{
const passThrough = new PassThrough();
const dest = new Writable({
write: common.mustCall((chunk, encoding, cb) => {
assert.strictEqual(`${chunk}`, 'foobar');
cb();
}, 2)
});
passThrough.pipe(dest);
passThrough.pipe(dest);
assert.strictEqual(passThrough._events.data.length, 2);
assert.strictEqual(passThrough._readableState.pipes.length, 2);
assert.strictEqual(passThrough._readableState.pipes[0], dest);
assert.strictEqual(passThrough._readableState.pipes[1], dest);
passThrough.write('foobar');
}
{
const passThrough = new PassThrough();
const dest = new Writable({
write: common.mustNotCall()
});
passThrough.pipe(dest);
passThrough.pipe(dest);
assert.strictEqual(passThrough._events.data.length, 2);
assert.strictEqual(passThrough._readableState.pipes.length, 2);
assert.strictEqual(passThrough._readableState.pipes[0], dest);
assert.strictEqual(passThrough._readableState.pipes[1], dest);
passThrough.unpipe(dest);
passThrough.unpipe(dest);
assert.strictEqual(passThrough._events.data, undefined);
assert.strictEqual(passThrough._readableState.pipes.length, 0);
passThrough.write('foobar');
}
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