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In Flutter, when writing unit tests, you might encounter situations where you want to stub or skip global functions. Since Dart does not have built-in support for mocking global functions, you can use packages like `mocktail` to help with this.

Here's a general approach to unit testing with `mocktail`, along with an example of how to stub a global function.

### Step 1: Add Dependencies

First, ensure you have the `mocktail` package in your `pubspec.yaml` file:

```yaml
dev_dependencies:
  flutter_test:
    sdk: flutter
  mocktail: ^0.3.0
```

### Step 2: Create a Wrapper for the Global Function

Since you cannot directly mock global functions, a common approach is to wrap the global function in a class or a function that you can mock. For example:

```dart
// global_functions.dart
library global_functions;

String fetchData() {
  // Imagine this function fetches data from a network or database
  return "Real Data";
}

// wrapper.dart
import 'global_functions.dart';

class GlobalFunctionWrapper {
  String fetchData() => global_functions.fetchData();
}
```

### Step 3: Use the Wrapper in Your Code

Now, instead of calling the global function directly, use the wrapper:

```dart
// my_service.dart
import 'wrapper.dart';

class MyService {
  final GlobalFunctionWrapper _wrapper;

  MyService(this._wrapper);

  String get
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}
```

### Step 4: Write Your Unit Test

Now, you can easily mock the `fetchData` method using `mocktail`:

```dart
// my_service_test.dart
import 'package:flutter_test/flutter_test.dart';
import 'package:mocktail/mocktail.dart';
import 'my_service.dart';
import 'wrapper.dart';

class MockGlobalFunctionWrapper extends Mock implements GlobalFunctionWrapper {}

void main() {
  group('MyService', () {
    late MyService myService;
    late MockGlobalFunctionWrapper mockWrapper;

    setUp(() {
      mockWrapper = MockGlobalFunctionWrapper();
      myService = MyService(mockWrapper);
    });

    test('getData returns mocked data', () {
      when(() => mockWrapper.fetchData()).thenReturn('Mocked Data');
      expect(myService.data, 'Mocked Data');
    });
  });
}
```

This example shows how to create a wrapper for the global function and then mock that wrapper in your test.  This allows you to isolate your unit tests and ensure they are testing the logic of `MyService` without depending on the actual implementation of the global `fetchData` function.  This approach is preferable to trying to directly mock global functions, which is generally not possible in Dart.

Remember to run `flutter pub get` after adding the `mocktail` dependency to your `pubspec.yaml`.  This solution provides a clean and maintainable way to handle global functions in your unit tests.  You can adapt this pattern for other global functions you might need to interact with in your tests.  The key is to always wrap the global function and then mock the wrapper.

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User: how do i mock getStorage in flutter
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