FakePermissionPlatform class

An in-memory OS for tests: drive the whole permission flow — dialogs included — in a widget test, with no device and no method channel.

final os = FakePermissionPlatform()
  ..whenRequested(Permission.camera, PermissionStatus.permanentlyDenied)
  ..onOpenAppSettings = (os) => os.setStatus(
    Permission.camera,
    PermissionStatus.granted,
  );
final permissions = os.createHandler();

It mimics the OS behaviours the package works around, so tests exercise the same paths real devices do:

• Android hides permanent denial from status checks. After a request returns permanentlyDenied, status reports denied, as Android does. iOS reports it as is.
• A permanently denied or restricted permission never prompts. A request returns the current status without consuming a scripted answer.
• iOS reports location as permanentlyDenied while Location Services are off (setService on Permission.location), and a request then returns at once.
• iOS reports locationAlways as permanentlyDenied once locationWhenInUse is granted, before the upgrade was ever asked for. A request still shows the upgrade prompt.

An unscripted request is answered granted — the user tapped Allow.