'use strict'; const common = require('../common'); const assert = require('assert'); const fs = require('fs'); const path = require('path'); const stream = require('stream'); const encoding = 'base64'; const example = path.join(common.fixturesDir, 'x.txt'); const assertStream = new stream.Writable({ write: function(chunk, enc, next) { const expected = Buffer.from('xyz'); assert(chunk.equals(expected)); } }); assertStream.setDefaultEncoding(encoding); fs.createReadStream(example, encoding).pipe(assertStream);