init

src/App.test.js

@@ -0,0 +1,9 @@
+import React from "react";
+import ReactDOM from "react-dom";
+import App from "./App";
+
+it("renders without crashing", () => {
+    const div = document.createElement("div");
+    ReactDOM.render(<App />, div);
+    ReactDOM.unmountComponentAtNode(div);
+});