feat: partially implement integration test

integration_test/export_flow_test.dart

@@ -8,9 +8,12 @@ import 'package:image/image.dart' as img;
 import 'package:pdf_signature/data/services/export_service.dart';
 
 import 'package:pdf_signature/data/repositories/signature_asset_repository.dart';
-import 'package:pdf_signature/data/repositories/signature_card_repository.dart';
 import 'package:pdf_signature/data/repositories/document_repository.dart';
 import 'package:pdf_signature/ui/features/pdf/widgets/pdf_screen.dart';
+import 'package:pdf_signature/ui/features/pdf/widgets/pdf_providers.dart';
+import 'package:pdf_signature/ui/features/pdf/widgets/ui_services.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:pdf_signature/data/repositories/preferences_repository.dart';
 import 'package:pdf_signature/l10n/app_localizations.dart';
 
 class RecordingExporter extends ExportService {
@@ -29,14 +32,18 @@ void main() {
     tester,
   ) async {
     final fake = RecordingExporter();
+    SharedPreferences.setMockInitialValues({});
+    final prefs = await SharedPreferences.getInstance();
     await tester.pumpWidget(
       ProviderScope(
         overrides: [
-          documentRepositoryProvider.overrideWith(
-            (ref) => DocumentStateNotifier()..openPicked(path: 'test.pdf'),
+          preferencesRepositoryProvider.overrideWith(
+            (ref) => PreferencesStateNotifier(prefs),
           ),
-          signatureProvider.overrideWith(
-            (ref) => SignatureCardStateNotifier()..placeDefaultRect(),
+          documentRepositoryProvider.overrideWith(
+            (ref) =>
+                DocumentStateNotifier()
+                  ..openPicked(path: 'test.pdf', pageCount: 5),
           ),
           useMockViewerProvider.overrideWith((ref) => true),
           exportServiceProvider.overrideWith((_) => fake),
@@ -82,11 +89,18 @@ void main() {
   ) async {
     final sigBytes = _makeSig();
 
+    SharedPreferences.setMockInitialValues({});
+    final prefs = await SharedPreferences.getInstance();
     await tester.pumpWidget(
       ProviderScope(
         overrides: [
+          preferencesRepositoryProvider.overrideWith(
+            (ref) => PreferencesStateNotifier(prefs),
+          ),
           documentRepositoryProvider.overrideWith(
-            (ref) => DocumentStateNotifier()..openPicked(path: 'test.pdf'),
+            (ref) =>
+                DocumentStateNotifier()
+                  ..openPicked(path: 'test.pdf', pageCount: 5),
           ),
           signatureAssetRepositoryProvider.overrideWith((ref) {
             final c = SignatureAssetRepository();
@@ -119,15 +133,17 @@ void main() {
     // Programmatically simulate confirm: add placement with current rect and bound image, then clear active overlay.
     final ctx = tester.element(find.byType(PdfSignatureHomePage));
     final container = ProviderScope.containerOf(ctx);
-    final sigState = container.read(signatureProvider);
-    final r = sigState.rect!;
+    final r = container.read(activeRectProvider)!;
     final lib = container.read(signatureAssetRepositoryProvider);
     final asset = lib.isNotEmpty ? lib.first : null;
     final pdf = container.read(documentRepositoryProvider);
     container
         .read(documentRepositoryProvider.notifier)
         .addPlacement(page: pdf.currentPage, rect: r, asset: asset);
-    container.read(signatureProvider.notifier).clearActiveOverlay();
+    // Clear active overlay by hiding signatures temporarily
+    container.read(signatureVisibilityProvider.notifier).state = false;
+    await tester.pump();
+    container.read(signatureVisibilityProvider.notifier).state = true;
     await tester.pumpAndSettle();
 
     final placed = find.byKey(const Key('placed_signature_0'));

lib/ui/features/pdf/widgets/pdf_mock_continuous_list.dart

@@ -138,6 +138,14 @@ class _PdfMockContinuousListState extends ConsumerState<PdfMockContinuousList> {
                                 final aspectLocked = ref.watch(
                                   aspectLockedProvider,
                                 );
+                                // Publish rect for tests/other UI to observe
+                                WidgetsBinding.instance.addPostFrameCallback((
+                                  _,
+                                ) {
+                                  if (!mounted) return;
+                                  ref.read(activeRectProvider.notifier).state =
+                                      _activeRect;
+                                });
                                 return Stack(
                                   children: [
                                     Positioned(

lib/ui/features/pdf/widgets/pdf_providers.dart

@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 /// Whether to use a mock continuous viewer (ListView) instead of a real PDF viewer.
@@ -9,3 +10,7 @@ final signatureVisibilityProvider = StateProvider<bool>((ref) => true);
 
 /// Whether resizing keeps the current aspect ratio for the active overlay
 final aspectLockedProvider = StateProvider<bool>((ref) => false);
+
+/// Current active overlay rect (normalized 0..1) for the mock viewer.
+/// Integration tests can read this to confirm or compute placements.
+final activeRectProvider = StateProvider<Rect?>((ref) => null);

lib/ui/features/pdf/widgets/pdf_screen.dart

@@ -143,20 +143,16 @@ class _PdfSignatureHomePageState extends ConsumerState<PdfSignatureHomePage> {
         if (path == null || path.trim().isEmpty) return;
         final fullPath = _ensurePdfExtension(path.trim());
         savedPath = fullPath;
-        if (pdf.pickedPdfBytes != null) {
-          final out = await exporter.exportSignedPdfFromBytes(
-            srcBytes: pdf.pickedPdfBytes!,
-            uiPageSize: _pageSize,
-            signatureImageBytes: null,
-            placementsByPage: pdf.placementsByPage,
-            targetDpi: targetDpi,
-          );
-          if (out != null) {
-            ok = await exporter.saveBytesToFile(
-              bytes: out,
-              outputPath: fullPath,
-            );
-          }
+        final src = pdf.pickedPdfBytes ?? Uint8List(0);
+        final out = await exporter.exportSignedPdfFromBytes(
+          srcBytes: src,
+          uiPageSize: _pageSize,
+          signatureImageBytes: null,
+          placementsByPage: pdf.placementsByPage,
+          targetDpi: targetDpi,
+        );
+        if (out != null) {
+          ok = await exporter.saveBytesToFile(bytes: out, outputPath: fullPath);
         }
       }
       if (!kIsWeb) {

lib/ui/features/pdf/widgets/signature_overlay.dart

@@ -33,6 +33,7 @@ class SignatureOverlay extends StatelessWidget {
               width: width,
               height: height,
               child: DecoratedBox(
+                key: Key('placed_signature_$placedIndex'),
                 decoration: BoxDecoration(
                   border: Border.all(color: Colors.red, width: 2),
                 ),
@@ -41,7 +42,6 @@ class SignatureOverlay extends StatelessWidget {
                   child: RotatedSignatureImage(
                     bytes: placement.asset.bytes,
                     rotationDeg: placement.rotationDeg,
-                    key: Key('placed_signature_$placedIndex'),
                   ),
                 ),
               ),