added unit testing, and started implementing unit tests...phew

node_modules/node-environment-flags/shim.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const getPolyfill = require('./polyfill');
+
+module.exports = () => {
+  const polyfill = getPolyfill();
+  if (polyfill !== process.allowedNodeEnvironmentFlags) {
+    Object.defineProperty(process, 'allowedNodeEnvironmentFlags', {
+      writable: true,
+      enumerable: true,
+      configurable: true,
+      value: polyfill
+    });
+  }
+  return polyfill;
+};