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'use strict'; const common = require('../common'); // This test ensures that Readable stream will continue to call _read // for streams with highWaterMark === 0 once the stream returns data // by calling push() asynchronously. const { Readable } = require('stream'); let count = 5; const r = new Readable({ // Called 6 times: First 5 return data, last one signals end of stream. read: common.mustCall(() => { process.nextTick(common.mustCall(() => { if (count--) r.push('a'); else r.push(null); })); }, 6), highWaterMark: 0, }); r.on('end', common.mustCall()); r.on('data', common.mustCall(5));