EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK - WindowsException was thrown running a test: Error 0x00000000 - whilst running a widget test

This is the error message:

The following WindowsException was thrown running a test:
Error 0x00000000: The operation completed successfully.

I am trying to pumpWidget using a ChangeNotifierProvider.

await tester.pumpWidget(
      ChangeNotifierProvider<PageViewModel>(
        create: (_) => PageViewModel(),
        child: MaterialApp(
          home: Scaffold(
            body: Page(),
          ),
        ),
      ),
    );

Reason I am doing the above is because in my Page() I return a Consumer

 return Consumer<PageViewModel>(
      builder: (context, model, child) => Scaffold()

I don't understand what am I doing wrong.

I have split my problem into parts to understand what was I missing until I bumpped into this and I honestly cannot get out of it. e.g Returning just the MaterialApp and calling my page. I read the error message and I have fixed it with the guide flutter was giving.