update unit test mocks and restructure test dir structure

__tests__/App.test.jsx

@@ -0,0 +1,37 @@
+import React from 'react';
+import { shallow, mount } from 'enzyme';
+import App from '../src/App';
+import api from '../src/api';
+import Dashboard from '../src/pages/Dashboard';
+import Login from '../src/pages/Login';
+
+describe('<App />', () => {
+  test('renders without crashing', () => {
+    const appWrapper = shallow(<App />);
+    expect(appWrapper.length).toBe(1);
+  });
+
+  test('renders login page when not authenticated', () => {
+    api.isAuthenticated = jest.fn();
+    api.isAuthenticated.mockReturnValue(false);
+
+    const appWrapper = mount(<App />);
+
+    const login = appWrapper.find(Login);
+    expect(login.length).toBe(1);
+    const dashboard = appWrapper.find(Dashboard);
+    expect(dashboard.length).toBe(0);
+  });
+
+  test('renders dashboard when authenticated', () => {
+    api.isAuthenticated = jest.fn();
+    api.isAuthenticated.mockReturnValue(true);
+
+    const appWrapper = mount(<App />);
+
+    const dashboard = appWrapper.find(Dashboard);
+    expect(dashboard.length).toBe(1);
+    const login = appWrapper.find(Login);
+    expect(login.length).toBe(0);
+  });
+});