implemented SettingsScreen golden test

test/screens/settings/settings_screen_golden_test.dart

@@ -0,0 +1,102 @@
+import 'dart:convert';
+
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:golden_toolkit/golden_toolkit.dart';
+import 'package:lightmeter/data/models/ev_source_type.dart';
+import 'package:lightmeter/data/models/metering_screen_layout_config.dart';
+import 'package:lightmeter/data/models/theme_type.dart';
+import 'package:lightmeter/data/shared_prefs_service.dart';
+import 'package:lightmeter/providers/user_preferences_provider.dart';
+import 'package:lightmeter/screens/settings/flow_settings.dart';
+import 'package:m3_lightmeter_iap/m3_lightmeter_iap.dart';
+import 'package:package_info_plus/package_info_plus.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../../application_mock.dart';
+
+class _SettingsScreenConfig {
+  final IAPProductStatus iapProductStatus;
+
+  _SettingsScreenConfig(this.iapProductStatus);
+
+  @override
+  String toString() {
+    final buffer = StringBuffer();
+    buffer.write(iapProductStatus.toString().split('.')[1]);
+    return buffer.toString();
+  }
+}
+
+final _testScenarios = [IAPProductStatus.purchased, IAPProductStatus.purchasable].map(
+  (iapProductStatus) => _SettingsScreenConfig(iapProductStatus),
+);
+
+void main() {
+  Future<void> setTheme(WidgetTester tester, Key scenarioWidgetKey, ThemeType themeType) async {
+    final flow = find.descendant(
+      of: find.byKey(scenarioWidgetKey),
+      matching: find.byType(SettingsFlow),
+    );
+    final BuildContext context = tester.element(flow);
+    UserPreferencesProvider.of(context).setThemeType(themeType);
+    await tester.pumpAndSettle();
+  }
+
+  setUpAll(() {
+    SharedPreferences.setMockInitialValues({
+      UserPreferencesService.evSourceTypeKey: EvSourceType.camera.index,
+      UserPreferencesService.meteringScreenLayoutKey: json.encode(
+        {
+          MeteringScreenLayoutFeature.equipmentProfiles: true,
+          MeteringScreenLayoutFeature.extremeExposurePairs: true,
+          MeteringScreenLayoutFeature.filmPicker: true,
+        }.toJson(),
+      ),
+    });
+    PackageInfo.setMockInitialValues(
+      appName: 'Lightmeter',
+      packageName: 'com.vodemn.lightmeter',
+      version: '0.18.0',
+      buildNumber: '48',
+      buildSignature: '',
+    );
+  });
+
+  testGoldens(
+    'SettingsScreen golden test',
+    (tester) async {
+      final builder = DeviceBuilder();
+      for (final scenario in _testScenarios) {
+        builder.addScenario(
+          name: scenario.toString(),
+          widget: _MockSettingsFlow(productStatus: scenario.iapProductStatus),
+          onCreate: (scenarioWidgetKey) async {
+            if (scenarioWidgetKey.toString().contains('Dark')) {
+              await setTheme(tester, scenarioWidgetKey, ThemeType.dark);
+            }
+          },
+        );
+      }
+      await tester.pumpDeviceBuilder(builder);
+      await screenMatchesGolden(
+        tester,
+        'settings_screen',
+      );
+    },
+  );
+}
+
+class _MockSettingsFlow extends StatelessWidget {
+  final IAPProductStatus productStatus;
+
+  const _MockSettingsFlow({required this.productStatus});
+
+  @override
+  Widget build(BuildContext context) {
+    return GoldenTestApplicationMock(
+      productStatus: productStatus,
+      child: const SettingsFlow(),
+    );
+  }
+}