Included isRunning test

src/App.tsx

@@ -2,7 +2,7 @@ import React from 'react';
 import { Form } from './components/LoginForm/LoginForm';
 
 export const App: React.FC = () => (
-  <div className="App">
+  <div className="App" data-testid="App">
     <header className="App-header">
       <Form />
     </header>