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'use strict';
const common = require('../common');
const assert = require('assert');
const Stream = require('stream');
const Readable = Stream.Readable;
const r = new Readable();
const N = 256;
let reads = 0;
r._read = function(n) {
return r.push(++reads === N ? null : Buffer.allocUnsafe(1));
};
r.on('end', common.mustCall(function() {}));
const w = new Stream();
w.writable = true;
let buffered = 0;
w.write = function(c) {
buffered += c.length;
process.nextTick(drain);
return false;
};
function drain() {
assert(buffered <= 3);
buffered = 0;
w.emit('drain');
}
w.end = common.mustCall(function() {});
// Just for kicks, let's mess with the drain count.
// This verifies that even if it gets negative in the
// pipe() cleanup function, we'll still function properly.
r.on('readable', function() {
w.emit('drain');
});
r.pipe(w);
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