feat(proj): init

mobile/widgetbook/test/catalog_smoke_test.dart

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+import 'package:flutter/cupertino.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:google_fonts/google_fonts.dart';
+import 'package:intl/date_symbol_data_local.dart';
+import 'package:please_pay_me/theme/theme.dart';
+import 'package:please_pay_me_widgetbook/catalog.dart';
+import 'package:widgetbook/widgetbook.dart';
+
+List<WidgetbookUseCase> _collectUseCases() {
+  final useCases = <WidgetbookUseCase>[];
+
+  void walk(WidgetbookNode node) {
+    if (node is WidgetbookUseCase) useCases.add(node);
+    for (final child in node.children ?? const <WidgetbookNode>[]) {
+      walk(child);
+    }
+  }
+
+  for (final root in buildCatalogDirectories()) {
+    walk(root);
+  }
+
+  return useCases;
+}
+
+/// Knobs read `WidgetbookState` from the context, so use-cases can only be
+/// pumped inside a scope.
+Widget _host({required CupertinoThemeData theme, required WidgetbookUseCase useCase}) {
+  return WidgetbookScope(
+    state: WidgetbookState(
+      path: useCase.path,
+      root: WidgetbookRoot(children: buildCatalogDirectories()),
+    ),
+    child: CupertinoApp(
+      theme: theme,
+      locale: const Locale('ru'),
+      home: Builder(builder: useCase.builder),
+    ),
+  );
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+  // No network access in tests — fall back to the default font instead.
+  GoogleFonts.config.allowRuntimeFetching = false;
+
+  setUpAll(() => initializeDateFormatting('ru'));
+
+  test('catalog directories are non-empty', () {
+    expect(buildCatalogDirectories(), isNotEmpty);
+  });
+
+  test('every use-case has a name and a builder', () {
+    final useCases = _collectUseCases();
+
+    for (final useCase in useCases) {
+      expect(useCase.name, isNotEmpty);
+      expect(useCase.builder, isNotNull);
+    }
+
+    expect(useCases.length, greaterThanOrEqualTo(20));
+  });
+
+  test('expected category folders exist', () {
+    final names = buildCatalogDirectories().map((n) => n.name).toSet();
+    expect(
+      names,
+      containsAll(<String>{'Atoms', 'Molecules', 'Navigation', 'Feedback', 'Screens'}),
+    );
+  });
+
+  group('use-cases render', () {
+    final themes = <String, CupertinoThemeData Function()>{
+      'Light': buildLightTheme,
+      'Dark': buildDarkTheme,
+    };
+
+    for (final entry in themes.entries) {
+      for (final useCase in _collectUseCases()) {
+        testWidgets('${useCase.path} (${entry.key})', (tester) async {
+          await tester.pumpWidget(_host(theme: entry.value(), useCase: useCase));
+          await tester.pump(const Duration(milliseconds: 300));
+
+          expect(tester.takeException(), isNull);
+        });
+      }
+    }
+  });
+}

mobile/widgetbook/test/widget_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:please_pay_me_widgetbook/app.dart';
+
+void main() {
+  testWidgets('WidgetbookRoot builds', (WidgetTester tester) async {
+    await tester.pumpWidget(const WidgetbookRoot());
+    await tester.pump();
+    expect(find.byType(WidgetbookRoot), findsOneWidget);
+  });
+}