halkyon/halkyon_learn_flutter/test/support/fake_file_picker.dart

import 'package:halkyon_learn_flutter/src/core/files/file_picker.dart';

/// A [FilePicker] that "picks" [next], if set, and notes what it was asked
/// for.
class FakeFilePicker() implements FilePicker {
  /// What the next pick gives; null as if the person cancelled.
  PickedFile? next;

  /// What the next pick of several gives; [next] alone if null.
  List<PickedFile>? nextMany;

  /// The extensions of each pick asked for, in order.
  final asked = <List<String>>[];

  @override
  Future<PickedFile?> pick({
    required String label,
    required List<String> extensions,
  }) async {
    asked.add(extensions);
    return next;
  }

  @override
  Future<List<PickedFile>> pickMany({
    required String label,
    required List<String> extensions,
  }) async {
    asked.add(extensions);
    return nextMany ?? [?next];
  }
}