feat(auth): add create oauth app link to enterprise route

src/routes/LoginEnterprise.test.tsx

@@ -2,6 +2,7 @@ import { fireEvent, render, screen } from '@testing-library/react';
 import { MemoryRouter } from 'react-router-dom';
 import * as TestRenderer from 'react-test-renderer';
 const { ipcRenderer } = require('electron');
+import { shell } from 'electron';
 import { mockedEnterpriseAccounts } from '../__mocks__/mockedData';
 import { AppContext } from '../context/App';
 import type { AuthState } from '../types';
@@ -14,6 +15,8 @@ jest.mock('react-router-dom', () => ({
 }));
 
 describe('routes/LoginEnterprise.tsx', () => {
+  const openExternalMock = jest.spyOn(shell, 'openExternal');
+
   const mockAccounts: AuthState = {
     enterpriseAccounts: [],
     user: null,
@@ -75,6 +78,40 @@ describe('routes/LoginEnterprise.tsx', () => {
     expect(validate(values).clientSecret).toBe('Invalid client secret.');
   });
 
+  describe("'Create new OAuth App' button", () => {
+    it('should be disabled if no hostname configured', async () => {
+      render(
+        <AppContext.Provider value={{ accounts: mockAccounts }}>
+          <MemoryRouter>
+            <LoginEnterpriseRoute />
+          </MemoryRouter>
+        </AppContext.Provider>,
+      );
+
+      fireEvent.click(screen.getByText('Create new OAuth App'));
+
+      expect(openExternalMock).toHaveBeenCalledTimes(0);
+    });
+
+    it('should open if hostname configured', async () => {
+      render(
+        <AppContext.Provider value={{ accounts: mockAccounts }}>
+          <MemoryRouter>
+            <LoginEnterpriseRoute />
+          </MemoryRouter>
+        </AppContext.Provider>,
+      );
+
+      fireEvent.change(screen.getByLabelText('Hostname'), {
+        target: { value: 'company.github.com' },
+      });
+
+      fireEvent.click(screen.getByText('Create new OAuth App'));
+
+      expect(openExternalMock).toHaveBeenCalledTimes(1);
+    });
+  });
+
   it('should receive a logged-in enterprise account', () => {
     const { rerender } = render(
       <AppContext.Provider value={{ accounts: mockAccounts }}>