chore(react-router-v6): revert paralell for tests, as my computer stared over 9000 node processes making my machine grind to a machine babbage would have disapointed with

packages/core-api/src/app/App.tsx

@@ -191,9 +191,7 @@ export class PrivateAppImpl implements BackstageApp {
         <ApiProvider apis={apis}>
           <AppContextProvider app={this}>
             <AppThemeProvider>
-              <Router>
-                <Routes basename={pathname}>{children}</Routes>
-              </Router>
+              <Router>{children}</Router>
             </AppThemeProvider>
           </AppContextProvider>
         </ApiProvider>

packages/core/src/components/Button/Button.test.jsx

@@ -15,26 +15,25 @@
  */
 
 import React from 'react';
-import { render, fireEvent } from '@testing-library/react';
+import { render, fireEvent, act } from '@testing-library/react';
 import { wrapInTestApp } from '@backstage/test-utils';
 import { Button } from './Button';
-import { MemoryRouter, Route } from 'react-router';
-import { act } from 'react-dom/test-utils';
+import { Route } from 'react-router';
 
 describe('<Button />', () => {
   it('navigates using react-router', async () => {
     const testString = 'This is test string';
     const buttonLabel = 'Navigate!';
-    const { getByText } = render(
+    const { getByText, getByRole } = render(
       wrapInTestApp(
-        <MemoryRouter>
+        <>
+          <Route path="/test" element={<p>{testString}</p>} />
           <Button to="/test">{buttonLabel}</Button>
-          <Route path="/test">{testString}</Route>{' '}
-        </MemoryRouter>,
+        </>,
       ),
     );
     expect(() => getByText(testString)).toThrow();
-    await act(async () => fireEvent.click(getByText(buttonLabel)));
+    await act(async () => fireEvent.click(getByRole('button')));
     expect(getByText(testString)).toBeInTheDocument();
   });
 });

packages/core/src/components/Link/Link.test.jsx

@@ -18,7 +18,7 @@ import React from 'react';
 import { render, fireEvent } from '@testing-library/react';
 import { wrapInTestApp } from '@backstage/test-utils';
 import { Link } from './Link';
-import { MemoryRouter, Route } from 'react-router';
+import { Route } from 'react-router';
 import { act } from 'react-dom/test-utils';
 
 describe('<Link />', () => {
@@ -27,14 +27,15 @@ describe('<Link />', () => {
     const linkText = 'Navigate!';
     const { getByText } = render(
       wrapInTestApp(
-        <MemoryRouter>
+        <>
           <Link to="/test">{linkText}</Link>
           <Route path="/test">{testString}</Route>
-        </MemoryRouter>,
+        </>,
       ),
     );
     expect(() => getByText(testString)).toThrow();
     await act(async () => fireEvent.click(getByText(linkText)));
+
     expect(getByText(testString)).toBeInTheDocument();
   });
 });