BadNote/test/vault_service_test.dart

// Proves the Phase-0 vault root recording: the path persists through
// SharedPreferences, vaultRootValid() is true ONLY when a path is set AND its
// directory exists, and clearVaultRoot() forgets it. Uses a real temp dir for
// existence checks and a mock SharedPreferences for persistence.

import 'dart:io';

import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:badnote/services/vault_service.dart';

void main() {
  TestWidgetsFlutterBinding.ensureInitialized();

  late Directory tempDir;

  setUp(() async {
    SharedPreferences.setMockInitialValues({});
    tempDir = await Directory.systemTemp.createTemp('vault_service_test');
  });

  tearDown(() async {
    if (await tempDir.exists()) {
      await tempDir.delete(recursive: true);
    }
  });

  Future<VaultService> makeService() async {
    final prefs = await SharedPreferences.getInstance();
    return VaultService.forTest(prefs);
  }

  test('starts with no vault root and is invalid', () async {
    final vault = await makeService();
    expect(vault.vaultRoot, isNull);
    expect(await vault.vaultRootValid(), isFalse);
  });

  test('setVaultRoot persists the path', () async {
    final vault = await makeService();
    await vault.setVaultRoot(tempDir.path);
    expect(vault.vaultRoot, tempDir.path);

    // Re-read through a fresh service over the SAME prefs store: persisted.
    final prefs = await SharedPreferences.getInstance();
    expect(prefs.getString(VaultService.vaultRootKey), tempDir.path);
    final reopened = VaultService.forTest(prefs);
    expect(reopened.vaultRoot, tempDir.path);
  });

  test('vaultRootValid is true only when set AND the dir exists', () async {
    final vault = await makeService();

    // Set to an existing dir → valid.
    await vault.setVaultRoot(tempDir.path);
    expect(await vault.vaultRootValid(), isTrue);

    // Point at a path that does not exist → invalid (folder went missing).
    final missing = '${tempDir.path}${Platform.pathSeparator}gone';
    await vault.setVaultRoot(missing);
    expect(vault.vaultRoot, missing);
    expect(await vault.vaultRootValid(), isFalse);
  });

  test('clearVaultRoot forgets the path and becomes invalid', () async {
    final vault = await makeService();
    await vault.setVaultRoot(tempDir.path);
    expect(await vault.vaultRootValid(), isTrue);

    await vault.clearVaultRoot();
    expect(vault.vaultRoot, isNull);
    expect(await vault.vaultRootValid(), isFalse);
  });

  test('empty stored path is treated as invalid', () async {
    final vault = await makeService();
    await vault.setVaultRoot('');
    expect(await vault.vaultRootValid(), isFalse);
  });
}