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| Current File : //proc/thread-self/root/home/ubuntu/node-v16.18.1/test/parallel/test-stream-readable-hwm-0.js |
'use strict';
const common = require('../common');
// This test ensures that Readable stream will call _read() for streams
// with highWaterMark === 0 upon .read(0) instead of just trying to
// emit 'readable' event.
const assert = require('assert');
const { Readable } = require('stream');
const r = new Readable({
// Must be called only once upon setting 'readable' listener
read: common.mustCall(),
highWaterMark: 0,
});
let pushedNull = false;
// This will trigger read(0) but must only be called after push(null)
// because the we haven't pushed any data
r.on('readable', common.mustCall(() => {
assert.strictEqual(r.read(), null);
assert.strictEqual(pushedNull, true);
}));
r.on('end', common.mustCall());
process.nextTick(() => {
assert.strictEqual(r.read(), null);
pushedNull = true;
r.push(null);
});
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