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'use strict';
const common = require('../common');
const assert = require('assert');
const Readable = require('_stream_readable');
const Writable = require('_stream_writable');
const EE = require('events').EventEmitter;
function runTest(highWaterMark, objectMode, produce) {
const old = new EE();
const r = new Readable({ highWaterMark: highWaterMark,
objectMode: objectMode });
assert.strictEqual(r, r.wrap(old));
r.on('end', common.mustCall(function() {}));
old.pause = function() {
old.emit('pause');
flowing = false;
};
old.resume = function() {
old.emit('resume');
flow();
};
let flowing;
let chunks = 10;
let oldEnded = false;
const expected = [];
function flow() {
flowing = true;
while (flowing && chunks-- > 0) {
const item = produce();
expected.push(item);
old.emit('data', item);
}
if (chunks <= 0) {
oldEnded = true;
old.emit('end');
}
}
const w = new Writable({ highWaterMark: highWaterMark * 2,
objectMode: objectMode });
const written = [];
w._write = function(chunk, encoding, cb) {
written.push(chunk);
setTimeout(cb, 1);
};
w.on('finish', common.mustCall(function() {
performAsserts();
}));
r.pipe(w);
flow();
function performAsserts() {
assert(oldEnded);
assert.deepStrictEqual(written, expected);
}
}
runTest(100, false, function() { return Buffer.allocUnsafe(100); });
runTest(10, false, function() { return Buffer.from('xxxxxxxxxx'); });
runTest(1, true, function() { return { foo: 'bar' }; });
const objectChunks = [ 5, 'a', false, 0, '', 'xyz', { x: 4 }, 7, [], 555 ];
runTest(1, true, function() { return objectChunks.shift(); });
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