bump jest and make tests pass

node_modules/safe-buffer/index.js

@@ -1,3 +1,4 @@
+/*! safe-buffer. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */
 /* eslint-disable node/no-deprecated-api */
 var buffer = require('buffer')
 var Buffer = buffer.Buffer
@@ -20,6 +21,8 @@ function SafeBuffer (arg, encodingOrOffset, length) {
   return Buffer(arg, encodingOrOffset, length)
 }
 
+SafeBuffer.prototype = Object.create(Buffer.prototype)
+
 // Copy static methods from Buffer
 copyProps(Buffer, SafeBuffer)