refactoring with hook and added more tests

Author: dhewzulla

__mocks__/qrcode.react.js

@@ -0,0 +1,13 @@
+import React from 'react';
+
+
+let tracker=Object.create(null);
+const QRCode = ({value,level,size})=>{
+       
+    tracker.lastCall={value,level,size};
+    return (<div data-testid="mock-qr-code">{value}</div>);
+}
+export {tracker};
+export default QRCode 
+
+

babel.config.js

@@ -1,5 +1,8 @@
   const presets = [
-      ['@babel/preset-env'],
+      ['@babel/preset-env',{
+        "targets": { "browsers": ["last 2 chrome versions"] },
+      //  "useBuiltIns": "entry"
+      }],
       ["@babel/preset-react"]
   ];
   plugins=["@babel/plugin-proposal-class-properties"]

jest.config.js

@@ -0,0 +1,4 @@
+module.exports = {
+    verbose: true,
+    setupFiles:['jest-canvas-mock', "<rootDir>/setupJest.js"]
+};