A whole bunch of changes

test/settings_screen_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+
+import 'package:fuel_tax_tracker/screens/data_settings_screen.dart';
+import 'package:fuel_tax_tracker/screens/settings_screen.dart';
+import 'package:fuel_tax_tracker/screens/ui_settings_screen.dart';
+import 'package:fuel_tax_tracker/services/app_state.dart';
+
+/// Covers the Settings landing page's menu wiring: it groups settings into
+/// two submenus — [UiSettingsScreen] (appearance) and [DataSettingsScreen]
+/// (cloud storage, photo syncing/quality, advanced/purge) — plus keeps a
+/// read-only summary on the landing page itself. The submenu screens'
+/// actual contents are covered by theme_toggle_test.dart and
+/// settings_purge_test.dart respectively.
+void main() {
+  Future<void> pumpSettings(WidgetTester tester) async {
+    final appState = AppState()..isLoading = false;
+    await tester.pumpWidget(
+      ChangeNotifierProvider.value(
+        value: appState,
+        child: const MaterialApp(home: SettingsScreen()),
+      ),
+    );
+  }
+
+  testWidgets('shows UI and Data menu entries, plus the summary', (tester) async {
+    await pumpSettings(tester);
+
+    expect(find.text('UI'), findsOneWidget);
+    expect(find.text('Data'), findsOneWidget);
+    expect(find.text('Summary'), findsOneWidget);
+    // None of Data's contents leaked onto the landing page.
+    expect(find.text('Cloud Storage'), findsNothing);
+    expect(find.text('Advanced'), findsNothing);
+  });
+
+  testWidgets('tapping UI opens UiSettingsScreen', (tester) async {
+    await pumpSettings(tester);
+
+    await tester.tap(find.text('UI'));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(UiSettingsScreen), findsOneWidget);
+    expect(find.text('Appearance'), findsOneWidget);
+  });
+
+  testWidgets('tapping Data opens DataSettingsScreen', (tester) async {
+    await pumpSettings(tester);
+
+    await tester.tap(find.text('Data'));
+    await tester.pumpAndSettle();
+
+    expect(find.byType(DataSettingsScreen), findsOneWidget);
+    expect(find.text('Cloud Storage'), findsOneWidget);
+    await tester.scrollUntilVisible(find.text('Advanced'), 200, scrollable: find.byType(Scrollable));
+    expect(find.text('Advanced'), findsOneWidget);
+  });
+}