Rewrite frontend using create-react-app

scripts/test.js

@@ -0,0 +1,21 @@
+'use strict';
+
+process.env.NODE_ENV = 'test';
+process.env.PUBLIC_URL = '';
+
+// Load environment variables from .env file. Suppress warnings using silent
+// if this file is missing. dotenv will never modify any environment variables
+// that have already been set.
+// https://github.com/motdotla/dotenv
+require('dotenv').config({silent: true});
+
+const jest = require('jest');
+const argv = process.argv.slice(2);
+
+// Watch unless on CI or in coverage mode
+if (!process.env.CI && argv.indexOf('--coverage') < 0) {
+  argv.push('--watch');
+}
+
+
+jest.run(argv);