I'm using Blob in node.js (v8.10.0) for creating a dummy file for the unit test. Below is my code `const Blob = require('blob');` `let dummyFileData = new Uint8Array( [ 137, 80, 78, 71, 130 ] );` `let dummyFileBlob = new Blob([ dummyFileData ], { type: 'image/png' });` 