chore: Initial commit

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XPovRHpejR4zRxuhjY4Qs3

test/screens/contacts_tab_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/models/channel.dart';
+import 'package:meshcore_sar_app/models/contact.dart';
+import 'package:meshcore_sar_app/models/contact_group.dart';
+import 'package:meshcore_sar_app/models/device_info.dart' as device_info;
+import 'package:meshcore_sar_app/providers/app_provider.dart';
+import 'package:meshcore_sar_app/providers/channels_provider.dart';
+import 'package:meshcore_sar_app/providers/connection_provider.dart';
+import 'package:meshcore_sar_app/providers/contacts_provider.dart';
+import 'package:meshcore_sar_app/providers/drawing_provider.dart';
+import 'package:meshcore_sar_app/providers/image_provider.dart'
+    as image_provider;
+import 'package:meshcore_sar_app/providers/map_provider.dart';
+import 'package:meshcore_sar_app/providers/messages_provider.dart';
+import 'package:meshcore_sar_app/providers/voice_provider.dart';
+import 'package:meshcore_sar_app/screens/contacts_tab.dart';
+import 'package:meshcore_sar_app/services/profiles_feature_service.dart';
+import 'package:meshcore_sar_app/services/voice_codec_service.dart';
+import 'package:meshcore_sar_app/services/voice_player_service.dart';
+import 'package:meshcore_sar_app/utils/contact_grouping.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class _FakeConnectionProvider extends ConnectionProvider {
+  _FakeConnectionProvider({required bool isConnected})
+    : _isConnected = isConnected;
+
+  final bool _isConnected;
+
+  @override
+  device_info.DeviceInfo get deviceInfo => device_info.DeviceInfo(
+    connectionState: _isConnected
+        ? device_info.ConnectionState.connected
+        : device_info.ConnectionState.disconnected,
+  );
+}
+
+class _FakeMessagesProvider extends MessagesProvider {
+  @override
+  bool get isInitialized => true;
+}
+
+class _FakeDrawingProvider extends DrawingProvider {
+  @override
+  bool get isInitialized => true;
+}
+
+void main() {
+  String? clipboardText;
+
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+    ProfileStorageScope.setScope(
+      profilesEnabled: false,
+      activeProfileId: 'default',
+    );
+    clipboardText = null;
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(SystemChannels.platform, (call) async {
+          switch (call.method) {
+            case 'Clipboard.setData':
+              clipboardText =
+                  (call.arguments as Map<dynamic, dynamic>)['text'] as String?;
+              return null;
+            case 'Clipboard.getData':
+              return <String, dynamic>{'text': clipboardText};
+          }
+          return null;
+        });
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(SystemChannels.platform, null);
+  });
+
+  Contact buildChannel({required String name, required int channelIndex}) {
+    final publicKey = Uint8List(32);
+    publicKey[0] = 0xFF;
+    publicKey[1] = channelIndex;
+
+    return Contact(
+      publicKey: publicKey,
+      type: ContactType.channel,
+      flags: 0,
+      outPathLen: -1,
+      outPath: Uint8List(0),
+      advName: name,
+      lastAdvert: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      advLat: 0,
+      advLon: 0,
+      lastMod: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    );
+  }
+
+  Contact buildRepeater({required int seed, required String name}) {
+    final publicKey = Uint8List(32);
+    publicKey[0] = seed;
+    publicKey[1] = seed + 1;
+
+    return Contact(
+      publicKey: publicKey,
+      type: ContactType.repeater,
+      flags: 0,
+      outPathLen: -1,
+      outPath: Uint8List(0),
+      advName: name,
+      lastAdvert: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      advLat: 46056000 + seed,
+      advLon: 14505000 + seed,
+      lastMod: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    );
+  }
+
+  Contact buildSensor({required int seed, required String name}) {
+    final publicKey = Uint8List(32);
+    publicKey[0] = seed;
+    publicKey[1] = seed + 1;
+
+    return Contact(
+      publicKey: publicKey,
+      type: ContactType.sensor,
+      flags: 0,
+      outPathLen: -1,
+      outPath: Uint8List(0),
+      advName: name,
+      lastAdvert: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      advLat: 46056000 + seed,
+      advLon: 14505000 + seed,
+      lastMod: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+    );
+  }
+
+  Future<void> pumpContactsTab(
+    WidgetTester tester, {
+    List<Contact> contacts = const [],
+    List<SavedContactGroup> savedGroups = const [],
+    ConnectionProvider? connectionProvider,
+  }) async {
+    final contactsProvider = ContactsProvider();
+    final resolvedConnectionProvider =
+        connectionProvider ?? ConnectionProvider();
+    final messagesProvider = _FakeMessagesProvider();
+    final drawingProvider = _FakeDrawingProvider();
+    final channelsProvider = ChannelsProvider();
+    final voiceProvider = VoiceProvider(
+      codec: VoiceCodecService(),
+      player: VoicePlayerService(),
+    );
+    final imageProvider = image_provider.ImageProvider();
+    final appProvider = AppProvider(
+      connectionProvider: resolvedConnectionProvider,
+      contactsProvider: contactsProvider,
+      messagesProvider: messagesProvider,
+      drawingProvider: drawingProvider,
+      channelsProvider: channelsProvider,
+      voiceProvider: voiceProvider,
+      imageProvider: imageProvider,
+    );
+    for (final contact in contacts) {
+      contactsProvider.addOrUpdateContact(contact);
+    }
+    if (savedGroups.isNotEmpty) {
+      await contactsProvider.replaceAutoGroupsForSection(
+        'repeaters',
+        savedGroups,
+      );
+    }
+
+    await tester.pumpWidget(
+      MultiProvider(
+        providers: [
+          ChangeNotifierProvider<ContactsProvider>(
+            create: (_) => contactsProvider,
+          ),
+          ChangeNotifierProvider<ConnectionProvider>(
+            create: (_) => resolvedConnectionProvider,
+          ),
+          ChangeNotifierProvider<MessagesProvider>(
+            create: (_) => messagesProvider,
+          ),
+          ChangeNotifierProvider(create: (_) => MapProvider()),
+          ChangeNotifierProvider<AppProvider>(create: (_) => appProvider),
+        ],
+        child: MaterialApp(
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const Scaffold(body: ContactsTab()),
+        ),
+      ),
+    );
+
+    await tester.pumpAndSettle();
+  }
+
+  testWidgets('private channel activity card shows delete action in sheet', (
+    tester,
+  ) async {
+    await pumpContactsTab(
+      tester,
+      contacts: [buildChannel(name: 'Ops', channelIndex: 3)],
+    );
+
+    expect(find.text('Ops'), findsOneWidget);
+    await tester.tap(find.text('Ops'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Export psk_base64'), findsNothing);
+    expect(find.text('Delete Channel'), findsOneWidget);
+
+    await tester.tap(find.text('Delete Channel'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Delete Channel'), findsWidgets);
+    expect(
+      find.text(
+        'Are you sure you want to delete channel "Ops"? This action cannot be undone.',
+      ),
+      findsOneWidget,
+    );
+  });
+
+  testWidgets('hash channel activity card exports psk_base64', (tester) async {
+    await pumpContactsTab(
+      tester,
+      contacts: [buildChannel(name: '#ops', channelIndex: 3)],
+    );
+
+    expect(find.text('#ops'), findsOneWidget);
+    await tester.tap(find.text('#ops'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Export psk_base64'), findsOneWidget);
+
+    await tester.tap(find.text('Export psk_base64'));
+    await tester.pump();
+    await tester.pump(const Duration(milliseconds: 300));
+
+    expect(clipboardText, Channel.pskBase64ForHashChannelName('#ops'));
+    expect(find.text('psk_base64 copied to clipboard'), findsOneWidget);
+  });
+
+  testWidgets('repeaters show Others group when multiple groups exist', (
+    tester,
+  ) async {
+    final repeaters = [
+      buildRepeater(seed: 10, name: 'AL-1'),
+      buildRepeater(seed: 11, name: 'AL-2'),
+      buildRepeater(seed: 12, name: 'AL-3'),
+      buildRepeater(seed: 13, name: 'AL-4'),
+      buildRepeater(seed: 20, name: 'BR-1'),
+      buildRepeater(seed: 21, name: 'BR-2'),
+      buildRepeater(seed: 22, name: 'BR-3'),
+      buildRepeater(seed: 23, name: 'BR-4'),
+      buildRepeater(seed: 30, name: 'Lone Relay'),
+    ];
+    final inferredGroups = ContactGrouping.inferGroups(repeaters);
+    final savedGroups = inferredGroups
+        .map(
+          (group) => SavedContactGroup(
+            id: 'repeaters_${group.key}',
+            sectionKey: 'repeaters',
+            label: group.label,
+            query: group.label,
+            createdAt: DateTime(2026, 3, 13, 10),
+            matchPrefixes: group.matchPrefixes,
+            isAutoGroup: true,
+          ),
+        )
+        .toList();
+
+    await pumpContactsTab(
+      tester,
+      contacts: repeaters,
+      savedGroups: savedGroups,
+    );
+
+    expect(find.text('AL-'), findsOneWidget);
+    expect(find.text('BR-'), findsOneWidget);
+    expect(find.text('Others'), findsOneWidget);
+    expect(find.text('Lone Relay'), findsNothing);
+  });
+
+  testWidgets('repeaters stay flat when only one group exists', (tester) async {
+    final repeaters = [
+      buildRepeater(seed: 40, name: 'AL-1'),
+      buildRepeater(seed: 41, name: 'AL-2'),
+      buildRepeater(seed: 42, name: 'AL-3'),
+      buildRepeater(seed: 43, name: 'AL-4'),
+      buildRepeater(seed: 50, name: 'Lone Relay'),
+    ];
+    final inferredGroups = ContactGrouping.inferGroups(repeaters);
+    final savedGroups = inferredGroups
+        .map(
+          (group) => SavedContactGroup(
+            id: 'repeaters_${group.key}',
+            sectionKey: 'repeaters',
+            label: group.label,
+            query: group.label,
+            createdAt: DateTime(2026, 3, 13, 10),
+            matchPrefixes: group.matchPrefixes,
+            isAutoGroup: true,
+          ),
+        )
+        .toList();
+
+    await pumpContactsTab(
+      tester,
+      contacts: repeaters,
+      savedGroups: savedGroups,
+    );
+
+    expect(find.text('AL-'), findsOneWidget);
+    expect(find.text('Others'), findsNothing);
+    expect(find.text('Lone Relay'), findsOneWidget);
+  });
+
+  testWidgets('sensor contacts render in their own section', (tester) async {
+    await pumpContactsTab(
+      tester,
+      contacts: [buildSensor(seed: 60, name: 'WX Station')],
+    );
+
+    expect(find.text('Sensors'), findsWidgets);
+    expect(find.text('WX Station'), findsOneWidget);
+  });
+
+  testWidgets(
+    'contacts sections do not show sensor or repeater discovery actions',
+    (tester) async {
+      await pumpContactsTab(
+        tester,
+        contacts: [
+          buildRepeater(seed: 70, name: 'Relay 1'),
+          buildSensor(seed: 71, name: 'WX Station'),
+        ],
+        connectionProvider: _FakeConnectionProvider(isConnected: true),
+      );
+
+      expect(find.byTooltip('Discover repeaters'), findsNothing);
+      expect(find.byTooltip('Discover sensors'), findsNothing);
+      expect(find.byIcon(Icons.radar), findsNothing);
+    },
+  );
+}

test/screens/device_config_screen_test.dart

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+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/models/device_info.dart' as device_info;
+import 'package:meshcore_sar_app/providers/channels_provider.dart';
+import 'package:meshcore_sar_app/providers/connection_provider.dart';
+import 'package:meshcore_sar_app/providers/contacts_provider.dart';
+import 'package:meshcore_sar_app/screens/device_config_screen.dart';
+import 'package:provider/provider.dart';
+
+class _FakeConnectionProvider extends ChangeNotifier
+    implements ConnectionProvider {
+  _FakeConnectionProvider(this._deviceInfo);
+
+  device_info.DeviceInfo _deviceInfo;
+
+  @override
+  device_info.DeviceInfo get deviceInfo => _deviceInfo;
+
+  void updateDeviceInfo(device_info.DeviceInfo nextDeviceInfo) {
+    _deviceInfo = nextDeviceInfo;
+    notifyListeners();
+  }
+
+  @override
+  Future<Map<String, String>> getCustomVars() async => const {};
+
+  @override
+  Future<void> getBatteryAndStorage() async {}
+
+  @override
+  Future<void> getAutoaddConfig() async {}
+
+  @override
+  Future<void> getAllowedRepeatFreq() async {}
+
+  @override
+  dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
+}
+
+Future<void> _pumpDeviceConfigScreen(
+  WidgetTester tester, {
+  required ConnectionProvider connectionProvider,
+}) async {
+  tester.view.physicalSize = const Size(1440, 4000);
+  tester.view.devicePixelRatio = 1;
+  addTearDown(tester.view.reset);
+
+  await tester.pumpWidget(
+    MultiProvider(
+      providers: [
+        ChangeNotifierProvider<ConnectionProvider>.value(
+          value: connectionProvider,
+        ),
+        ChangeNotifierProvider<ChannelsProvider>(
+          create: (_) => ChannelsProvider()..initializePublicChannel(),
+        ),
+        ChangeNotifierProvider<ContactsProvider>(
+          create: (_) => ContactsProvider(),
+        ),
+      ],
+      child: MaterialApp(
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: const DeviceConfigScreen(),
+      ),
+    ),
+  );
+
+  await tester.pump();
+}
+
+void main() {
+  testWidgets(
+    'matches a preset when bandwidth arrives as raw Hz',
+    (tester) async {
+      final connectionProvider = _FakeConnectionProvider(
+        device_info.DeviceInfo(
+          connectionState: device_info.ConnectionState.connected,
+          radioFreq: 869618,
+          radioBw: 62500,
+          radioSf: 8,
+          radioCr: 8,
+        ),
+      );
+
+      await _pumpDeviceConfigScreen(
+        tester,
+        connectionProvider: connectionProvider,
+      );
+
+      expect(find.byKey(const ValueKey('eu_uk_narrow')), findsOneWidget);
+      expect(find.text('EU/UK (Narrow)'), findsWidgets);
+    },
+  );
+
+  testWidgets(
+    're-syncs the preset dropdown when device info changes',
+    (tester) async {
+      final connectionProvider = _FakeConnectionProvider(
+        device_info.DeviceInfo(
+          connectionState: device_info.ConnectionState.connected,
+        ),
+      );
+
+      await _pumpDeviceConfigScreen(
+        tester,
+        connectionProvider: connectionProvider,
+      );
+
+      expect(find.byKey(const ValueKey('custom')), findsOneWidget);
+
+      connectionProvider.updateDeviceInfo(
+        device_info.DeviceInfo(
+          connectionState: device_info.ConnectionState.connected,
+          radioFreq: 869618,
+          radioBw: 62500,
+          radioSf: 8,
+          radioCr: 8,
+        ),
+      );
+      await tester.pump();
+
+      expect(find.byKey(const ValueKey('eu_uk_narrow')), findsOneWidget);
+    },
+  );
+}

test/screens/discovery_screen_test.dart

@@ -0,0 +1,206 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/models/device_info.dart' as device_info;
+import 'package:meshcore_sar_app/providers/connection_provider.dart';
+import 'package:meshcore_sar_app/providers/contacts_provider.dart';
+import 'package:meshcore_sar_app/screens/discovery_screen.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class _FakeConnectionProvider extends ConnectionProvider {
+  _FakeConnectionProvider({required bool isConnected})
+    : _isConnected = isConnected;
+
+  final bool _isConnected;
+  final List<int> discoveredAdvertTypes = <int>[];
+
+  @override
+  device_info.DeviceInfo get deviceInfo => device_info.DeviceInfo(
+    connectionState: _isConnected
+        ? device_info.ConnectionState.connected
+        : device_info.ConnectionState.disconnected,
+  );
+
+  @override
+  Future<void> discoverNodeType({
+    required int advertType,
+    bool prefixOnly = false,
+    int since = 0,
+  }) async {
+    discoveredAdvertTypes.add(advertType);
+  }
+}
+
+Future<void> _pumpDiscoveryScreen(
+  WidgetTester tester, {
+  ContactsProvider? contactsProvider,
+  ConnectionProvider? connectionProvider,
+  DiscoveryScreen screen = const DiscoveryScreen(),
+}) async {
+  final resolvedContactsProvider = contactsProvider ?? ContactsProvider();
+  final resolvedConnectionProvider =
+      connectionProvider ?? _FakeConnectionProvider(isConnected: true);
+
+  await tester.pumpWidget(
+    MultiProvider(
+      providers: [
+        ChangeNotifierProvider<ContactsProvider>.value(
+          value: resolvedContactsProvider,
+        ),
+        ChangeNotifierProvider<ConnectionProvider>.value(
+          value: resolvedConnectionProvider,
+        ),
+      ],
+      child: MaterialApp(
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: screen,
+      ),
+    ),
+  );
+
+  await tester.pumpAndSettle();
+}
+
+Uint8List _publicKey(int seed) {
+  final bytes = Uint8List(32);
+  bytes[0] = seed;
+  bytes[1] = seed + 1;
+  bytes[2] = seed + 2;
+  return bytes;
+}
+
+void main() {
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+  });
+
+  testWidgets(
+    'discovery actions are shown in the summary card instead of overflow menu',
+    (tester) async {
+      tester.view.physicalSize = const Size(375, 812);
+      tester.view.devicePixelRatio = 1;
+      addTearDown(tester.view.reset);
+
+      final connectionProvider = _FakeConnectionProvider(isConnected: true);
+
+      await _pumpDiscoveryScreen(
+        tester,
+        connectionProvider: connectionProvider,
+      );
+
+      expect(tester.takeException(), isNull);
+      expect(find.text('Discover repeaters'), findsOneWidget);
+      expect(find.text('Discover sensors'), findsOneWidget);
+      expect(find.text('Resolve all'), findsOneWidget);
+      expect(find.text('Clear all'), findsOneWidget);
+      expect(find.text('Search discovered nodes'), findsNothing);
+      expect(find.byIcon(Icons.more_vert), findsNothing);
+      expect(
+        find.text(
+          'Use the discovery actions above to find repeaters and sensors on the mesh.',
+        ),
+        findsOneWidget,
+      );
+
+      await tester.tap(find.text('Discover repeaters'));
+      await tester.pump();
+
+      expect(connectionProvider.discoveredAdvertTypes, [2]);
+      expect(find.text('Repeater discovery sent'), findsOneWidget);
+    },
+  );
+
+  testWidgets('auto discovery can trigger repeater discovery on open', (
+    tester,
+  ) async {
+    final connectionProvider = _FakeConnectionProvider(isConnected: true);
+
+    await _pumpDiscoveryScreen(
+      tester,
+      connectionProvider: connectionProvider,
+      screen: const DiscoveryScreen(autoDiscoverRepeatersOnOpen: true),
+    );
+
+    expect(connectionProvider.discoveredAdvertTypes, [2]);
+    expect(find.text('Repeater discovery sent'), findsOneWidget);
+  });
+
+  testWidgets('search and inline type filters narrow discovered nodes', (
+    tester,
+  ) async {
+    tester.view.physicalSize = const Size(390, 1400);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.reset);
+
+    final contactsProvider = ContactsProvider()
+      ..addOrUpdatePendingAdvertMetadata(
+        publicKey: _publicKey(0x10),
+        typeValue: 2,
+        advName: 'Relay Alpha',
+      )
+      ..addOrUpdatePendingAdvertMetadata(
+        publicKey: _publicKey(0x20),
+        typeValue: 4,
+        advName: 'WX Station',
+      )
+      ..addOrUpdatePendingAdvertMetadata(
+        publicKey: _publicKey(0x30),
+        typeValue: 3,
+        advName: 'Ops Room',
+      );
+
+    await _pumpDiscoveryScreen(
+      tester,
+      contactsProvider: contactsProvider,
+      connectionProvider: _FakeConnectionProvider(isConnected: true),
+    );
+
+    expect(find.text('Search discovered nodes'), findsOneWidget);
+    expect(find.text('All'), findsOneWidget);
+    expect(find.text('Repeaters'), findsOneWidget);
+    expect(find.text('Sensors'), findsOneWidget);
+    expect(find.text('Others'), findsOneWidget);
+
+    expect(find.text('Relay Alpha'), findsOneWidget);
+    expect(find.text('WX Station'), findsOneWidget);
+    expect(find.text('Ops Room'), findsOneWidget);
+
+    await tester.tap(find.text('Sensors'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Relay Alpha'), findsNothing);
+    expect(find.text('WX Station'), findsOneWidget);
+    expect(find.text('Ops Room'), findsNothing);
+    expect(find.text('Discovered nodes (1/3)'), findsOneWidget);
+
+    await tester.tap(find.text('Others'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Relay Alpha'), findsNothing);
+    expect(find.text('WX Station'), findsNothing);
+    expect(find.text('Ops Room'), findsOneWidget);
+
+    await tester.enterText(find.byType(TextField), 'relay');
+    await tester.pumpAndSettle();
+
+    expect(find.text('No matches'), findsOneWidget);
+
+    await tester.tap(find.text('All'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Relay Alpha'), findsOneWidget);
+    expect(find.text('Ops Room'), findsNothing);
+
+    await tester.enterText(find.byType(TextField), 'ops');
+    await tester.pumpAndSettle();
+
+    expect(find.text('Relay Alpha'), findsNothing);
+    expect(find.text('WX Station'), findsNothing);
+    expect(find.text('Ops Room'), findsOneWidget);
+    expect(find.text('Discovered nodes (1/3)'), findsOneWidget);
+  });
+}

test/screens/live_traffic_screen_test.dart

@@ -0,0 +1,367 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/models/channel.dart';
+import 'package:meshcore_sar_app/models/ble_packet_log.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/providers/channels_provider.dart';
+import 'package:meshcore_sar_app/screens/live_traffic_screen.dart';
+import 'package:provider/provider.dart';
+
+BlePacketLog _log({
+  required DateTime timestamp,
+  required PacketDirection direction,
+  required List<int> rawData,
+  int? responseCode,
+  double? snrDb,
+  int? rssiDbm,
+}) {
+  return BlePacketLog(
+    timestamp: timestamp,
+    rawData: Uint8List.fromList(rawData),
+    direction: direction,
+    responseCode: responseCode ?? (rawData.isEmpty ? null : rawData.first),
+    logRxDataInfo: snrDb == null && rssiDbm == null
+        ? null
+        : LogRxDataInfo(
+            entropy: 0,
+            isLikelyEncrypted: false,
+            snrDb: snrDb,
+            rssiDbm: rssiDbm,
+          ),
+  );
+}
+
+List<int> _multiHopRaw({
+  required List<int> hops,
+  int payloadType = 0x01,
+  int hashSize = 2,
+}) {
+  final hopCount = hops.length ~/ hashSize;
+  final pathDescriptor = ((hashSize - 1) << 6) | hopCount;
+  return [
+    0x88,
+    0x00,
+    0x00,
+    payloadType << 2,
+    0x00,
+    0x00,
+    0x00,
+    0x00,
+    pathDescriptor,
+    ...hops,
+  ];
+}
+
+Widget _testApp(Widget child, {ChannelsProvider? channelsProvider}) {
+  final app = MaterialApp(
+    localizationsDelegates: AppLocalizations.localizationsDelegates,
+    supportedLocales: AppLocalizations.supportedLocales,
+    home: child,
+  );
+  if (channelsProvider == null) {
+    return app;
+  }
+  return ChangeNotifierProvider.value(value: channelsProvider, child: app);
+}
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  final launchedUrls = <String>[];
+
+  setUp(() {
+    launchedUrls.clear();
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(
+          const MethodChannel('plugins.flutter.io/url_launcher'),
+          (call) async {
+            switch (call.method) {
+              case 'canLaunch':
+                return true;
+              case 'launch':
+                final arguments = Map<dynamic, dynamic>.from(
+                  call.arguments as Map<dynamic, dynamic>,
+                );
+                launchedUrls.add(arguments['url'] as String);
+                return true;
+            }
+            return null;
+          },
+        );
+  });
+
+  tearDown(() {
+    TestDefaultBinaryMessengerBinding.instance.defaultBinaryMessenger
+        .setMockMethodCallHandler(
+          const MethodChannel('plugins.flutter.io/url_launcher'),
+          null,
+        );
+  });
+
+  testWidgets('shows empty state before traffic arrives', (tester) async {
+    final logs = <BlePacketLog>[];
+    final refresh = ValueNotifier<int>(0);
+    DateTime now = DateTime(2026, 3, 12, 12, 0, 0);
+
+    await tester.pumpWidget(
+      _testApp(
+        LiveTrafficScreen(
+          logReader: () => logs,
+          refreshListenable: refresh,
+          now: () => now,
+        ),
+      ),
+    );
+
+    expect(find.text('No packets for this filter'), findsOneWidget);
+    expect(find.text('Quiet'), findsOneWidget);
+  });
+
+  testWidgets('updates summary and stream for incoming live traffic', (
+    tester,
+  ) async {
+    final logs = <BlePacketLog>[];
+    final refresh = ValueNotifier<int>(0);
+    DateTime now = DateTime(2026, 3, 12, 12, 0, 0);
+
+    await tester.pumpWidget(
+      _testApp(
+        LiveTrafficScreen(
+          logReader: () => logs,
+          refreshListenable: refresh,
+          now: () => now,
+        ),
+      ),
+    );
+
+    logs.addAll([
+      _log(
+        timestamp: now.subtract(const Duration(seconds: 10)),
+        direction: PacketDirection.rx,
+        rawData: _multiHopRaw(hops: [0xC0, 0x10, 0x63, 0x01, 0x68, 0xD9]),
+        responseCode: 0x88,
+        snrDb: 13.5,
+        rssiDbm: -84,
+      ),
+      _log(
+        timestamp: now.subtract(const Duration(seconds: 3)),
+        direction: PacketDirection.tx,
+        rawData: [0x05, 0x01, 0x02],
+        responseCode: 0x88,
+      ),
+      _log(
+        timestamp: now.subtract(const Duration(seconds: 2)),
+        direction: PacketDirection.rx,
+        rawData: [0x05, 0x01, 0x02],
+        responseCode: 0x05,
+      ),
+    ]);
+    refresh.value += 1;
+    await tester.pump();
+
+    expect(find.text('1 pkt/min'), findsOneWidget);
+    expect(find.text('Device total 1'), findsOneWidget);
+    expect(find.text('FLOOD RESPONSE'), findsOneWidget);
+    expect(find.text('-84 dBm'), findsOneWidget);
+    expect(find.textContaining('Hash:'), findsOneWidget);
+    expect(
+      find.textContaining('Path: 3 hops [c010,6301,68d9]'),
+      findsOneWidget,
+    );
+    expect(find.textContaining('Path Hashes: 2-byte per hop'), findsOneWidget);
+  });
+
+  testWidgets('clear live view only resets transient screen state', (
+    tester,
+  ) async {
+    final logs = <BlePacketLog>[];
+    final refresh = ValueNotifier<int>(0);
+    DateTime now = DateTime(2026, 3, 12, 12, 0, 0);
+
+    logs.add(
+      _log(
+        timestamp: now.subtract(const Duration(seconds: 4)),
+        direction: PacketDirection.rx,
+        rawData: _multiHopRaw(hops: [0xC0, 0x10, 0x63, 0x01]),
+        responseCode: 0x88,
+      ),
+    );
+
+    await tester.pumpWidget(
+      _testApp(
+        LiveTrafficScreen(
+          logReader: () => logs,
+          refreshListenable: refresh,
+          now: () => now,
+        ),
+      ),
+    );
+
+    expect(find.text('FLOOD RESPONSE'), findsOneWidget);
+
+    await tester.tap(find.byTooltip('Clear live view'));
+    await tester.pump();
+
+    expect(find.text('No packets for this filter'), findsOneWidget);
+
+    now = now.add(const Duration(seconds: 2));
+    logs.add(
+      _log(
+        timestamp: now,
+        direction: PacketDirection.tx,
+        rawData: [0x03, 0x04],
+        responseCode: 0x88,
+      ),
+    );
+    logs.add(
+      _log(
+        timestamp: now,
+        direction: PacketDirection.rx,
+        rawData: [0x88, 0x00, 0x00],
+        responseCode: 0x88,
+      ),
+    );
+    refresh.value += 1;
+    await tester.pump();
+
+    expect(find.text('No packets for this filter'), findsNothing);
+    expect(find.textContaining('Size: 3 bytes'), findsOneWidget);
+  });
+
+  testWidgets('shows known channel name for group traffic', (tester) async {
+    final logs = <BlePacketLog>[];
+    final refresh = ValueNotifier<int>(0);
+    final channel = Channel.create(index: 3, name: '#ops');
+    final channelsProvider = ChannelsProvider()
+      ..initializePublicChannel()
+      ..addOrUpdateChannelObject(channel);
+    final now = DateTime(2026, 3, 12, 12, 0, 0);
+
+    logs.add(
+      _log(
+        timestamp: now.subtract(const Duration(seconds: 4)),
+        direction: PacketDirection.rx,
+        rawData: [
+          ..._multiHopRaw(hops: [0xC0, 0x10], payloadType: 0x05),
+          channel.hashByte,
+        ],
+        responseCode: 0x88,
+      ),
+    );
+
+    await tester.pumpWidget(
+      _testApp(
+        LiveTrafficScreen(
+          logReader: () => logs,
+          refreshListenable: refresh,
+          now: () => now,
+        ),
+        channelsProvider: channelsProvider,
+      ),
+    );
+
+    expect(find.text('#ops'), findsOneWidget);
+    expect(find.text('Channel: #ops (${channel.hashHex})'), findsOneWidget);
+    expect(find.text('FLOOD GROUP_TEXT'), findsNothing);
+  });
+
+  testWidgets('shows packet type help sheet from the app bar', (tester) async {
+    final logs = <BlePacketLog>[];
+    final refresh = ValueNotifier<int>(0);
+    final now = DateTime(2026, 3, 12, 12, 0, 0);
+
+    await tester.pumpWidget(
+      _testApp(
+        LiveTrafficScreen(
+          logReader: () => logs,
+          refreshListenable: refresh,
+          now: () => now,
+        ),
+      ),
+    );
+
+    await tester.tap(find.byTooltip('Packet type help'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Packet Types'), findsOneWidget);
+    await tester.scrollUntilVisible(
+      find.text('FLOOD RETURNED_PATH'),
+      300,
+      scrollable: find.byType(Scrollable).last,
+    );
+    await tester.pumpAndSettle();
+    expect(find.text('FLOOD RETURNED_PATH'), findsOneWidget);
+    expect(
+      find.textContaining('stores that returned path as the peer\'s direct out-path'),
+      findsOneWidget,
+    );
+    await tester.scrollUntilVisible(
+      find.text('FLOOD CONTROL'),
+      300,
+      scrollable: find.byType(Scrollable).last,
+    );
+    await tester.pumpAndSettle();
+    expect(find.text('FLOOD CONTROL'), findsOneWidget);
+  });
+
+  testWidgets('opens public stats from the app bar', (tester) async {
+    final logs = <BlePacketLog>[];
+    final refresh = ValueNotifier<int>(0);
+    final now = DateTime(2026, 3, 12, 12, 0, 0);
+
+    await tester.pumpWidget(
+      _testApp(
+        LiveTrafficScreen(
+          logReader: () => logs,
+          refreshListenable: refresh,
+          now: () => now,
+        ),
+      ),
+    );
+
+    await tester.tap(find.byTooltip('View public stats'));
+    await tester.pump();
+
+    expect(launchedUrls, ['https://mcstats.dz0ny.dev']);
+  });
+
+  testWidgets('summary metrics expand across wide layouts', (tester) async {
+    tester.view.physicalSize = const Size(1200, 900);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.reset);
+
+    final now = DateTime(2026, 3, 12, 12, 0, 0);
+    final logs = [
+      _log(
+        timestamp: now.subtract(const Duration(seconds: 10)),
+        direction: PacketDirection.rx,
+        rawData: _multiHopRaw(hops: [0xC0, 0x10, 0x63, 0x01]),
+        responseCode: 0x88,
+        snrDb: 9.5,
+        rssiDbm: -82,
+      ),
+    ];
+
+    await tester.pumpWidget(
+      _testApp(LiveTrafficScreen(logReader: () => logs, now: () => now)),
+    );
+
+    expect(
+      tester
+              .getSize(
+                find.byKey(const ValueKey('liveTrafficMetric:rxPackets')),
+              )
+              .width >
+          200,
+      isTrue,
+    );
+    expect(
+      tester
+              .getSize(find.byKey(const ValueKey('liveTrafficMetric:multihop')))
+              .width >
+          200,
+      isTrue,
+    );
+  });
+}

test/screens/messages_tab_test.dart

@@ -0,0 +1,435 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/models/contact.dart';
+import 'package:meshcore_sar_app/models/message.dart';
+import 'package:meshcore_sar_app/providers/app_provider.dart';
+import 'package:meshcore_sar_app/providers/channels_provider.dart';
+import 'package:meshcore_sar_app/providers/connection_provider.dart';
+import 'package:meshcore_sar_app/providers/contacts_provider.dart';
+import 'package:meshcore_sar_app/providers/drawing_provider.dart';
+import 'package:meshcore_sar_app/providers/image_provider.dart' as ip;
+import 'package:meshcore_sar_app/providers/map_provider.dart';
+import 'package:meshcore_sar_app/providers/messages_provider.dart';
+import 'package:meshcore_sar_app/providers/voice_provider.dart';
+import 'package:meshcore_sar_app/screens/messages_tab.dart';
+import 'package:meshcore_sar_app/services/message_destination_preferences.dart';
+import 'package:meshcore_sar_app/services/voice_codec_service.dart';
+import 'package:meshcore_sar_app/services/voice_player_service.dart';
+import 'package:provider/provider.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import 'dart:typed_data';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  Contact buildContact({
+    required String name,
+    required ContactType type,
+    int secondByte = 1,
+  }) {
+    final publicKey = Uint8List(32);
+    publicKey[0] = secondByte;
+    publicKey[1] = secondByte;
+
+    return Contact(
+      publicKey: publicKey,
+      type: type,
+      flags: 0,
+      outPathLen: 0,
+      outPath: Uint8List(64),
+      advName: name,
+      lastAdvert: 0,
+      advLat: 0,
+      advLon: 0,
+      lastMod: 0,
+    );
+  }
+
+  setUp(() {
+    SharedPreferences.setMockInitialValues({});
+  });
+
+  testWidgets('marks public channel as read after 5 seconds of viewing', (
+    tester,
+  ) async {
+    final connectionProvider = ConnectionProvider();
+    final contactsProvider = ContactsProvider();
+    final messagesProvider = MessagesProvider();
+    final mapProvider = MapProvider();
+    final drawingProvider = DrawingProvider();
+    final channelsProvider = ChannelsProvider()..initializePublicChannel();
+    final voiceProvider = VoiceProvider(
+      codec: VoiceCodecService(),
+      player: VoicePlayerService(),
+    );
+    final imageProvider = ip.ImageProvider();
+    final appProvider = AppProvider(
+      connectionProvider: connectionProvider,
+      contactsProvider: contactsProvider,
+      messagesProvider: messagesProvider,
+      drawingProvider: drawingProvider,
+      channelsProvider: channelsProvider,
+      voiceProvider: voiceProvider,
+      imageProvider: imageProvider,
+    );
+
+    messagesProvider.addMessage(
+      Message(
+        id: 'public-unread',
+        messageType: MessageType.channel,
+        pathLen: 1,
+        textType: MessageTextType.plain,
+        senderTimestamp: 1700000100,
+        text: 'Unread on public channel',
+        receivedAt: DateTime.now(),
+        channelIdx: 0,
+      ),
+    );
+
+    await tester.pumpWidget(
+      MultiProvider(
+        providers: [
+          ChangeNotifierProvider.value(value: connectionProvider),
+          ChangeNotifierProvider.value(value: contactsProvider),
+          ChangeNotifierProvider.value(value: messagesProvider),
+          ChangeNotifierProvider.value(value: mapProvider),
+          ChangeNotifierProvider.value(value: drawingProvider),
+          ChangeNotifierProvider.value(value: channelsProvider),
+          ChangeNotifierProvider.value(value: voiceProvider),
+          ChangeNotifierProvider.value(value: imageProvider),
+          ChangeNotifierProvider.value(value: appProvider),
+        ],
+        child: MaterialApp(
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const Scaffold(body: MessagesTab(isActive: true)),
+        ),
+      ),
+    );
+
+    await tester.pump();
+
+    expect(messagesProvider.unreadCount, 1);
+
+    await tester.pump(const Duration(seconds: 4));
+    expect(messagesProvider.unreadCount, 1);
+
+    await tester.pump(const Duration(seconds: 1));
+    await tester.pump();
+
+    expect(messagesProvider.unreadCount, 0);
+
+    appProvider.dispose();
+    voiceProvider.dispose();
+    imageProvider.dispose();
+    drawingProvider.dispose();
+    mapProvider.dispose();
+    messagesProvider.dispose();
+    contactsProvider.dispose();
+    connectionProvider.dispose();
+    channelsProvider.dispose();
+  });
+
+  testWidgets('shows mention overlay above composer and inserts selection', (
+    tester,
+  ) async {
+    final connectionProvider = ConnectionProvider();
+    final contactsProvider = ContactsProvider();
+    final messagesProvider = MessagesProvider();
+    final mapProvider = MapProvider();
+    final drawingProvider = DrawingProvider();
+    await messagesProvider.initialize();
+    await drawingProvider.initialize();
+    final channelsProvider = ChannelsProvider()..initializePublicChannel();
+    final voiceProvider = VoiceProvider(
+      codec: VoiceCodecService(),
+      player: VoicePlayerService(),
+    );
+    final imageProvider = ip.ImageProvider();
+    final appProvider = AppProvider(
+      connectionProvider: connectionProvider,
+      contactsProvider: contactsProvider,
+      messagesProvider: messagesProvider,
+      drawingProvider: drawingProvider,
+      channelsProvider: channelsProvider,
+      voiceProvider: voiceProvider,
+      imageProvider: imageProvider,
+    );
+
+    contactsProvider.addContacts([
+      buildContact(name: 'Tim', type: ContactType.chat, secondByte: 2),
+      buildContact(name: 'Slane', type: ContactType.chat, secondByte: 3),
+    ]);
+
+    await tester.pumpWidget(
+      MultiProvider(
+        providers: [
+          ChangeNotifierProvider.value(value: connectionProvider),
+          ChangeNotifierProvider.value(value: contactsProvider),
+          ChangeNotifierProvider.value(value: messagesProvider),
+          ChangeNotifierProvider.value(value: mapProvider),
+          ChangeNotifierProvider.value(value: drawingProvider),
+          ChangeNotifierProvider.value(value: channelsProvider),
+          ChangeNotifierProvider.value(value: voiceProvider),
+          ChangeNotifierProvider.value(value: imageProvider),
+          ChangeNotifierProvider.value(value: appProvider),
+        ],
+        child: MaterialApp(
+          localizationsDelegates: AppLocalizations.localizationsDelegates,
+          supportedLocales: AppLocalizations.supportedLocales,
+          home: const Scaffold(body: MessagesTab(isActive: true)),
+        ),
+      ),
+    );
+
+    await tester.pumpAndSettle();
+    await tester.pump(const Duration(milliseconds: 60));
+
+    await tester.tap(find.byType(TextField).first);
+    await tester.enterText(find.byType(TextField).first, '@t');
+    await tester.pumpAndSettle();
+
+    expect(find.text('Tim'), findsOneWidget);
+    expect(find.text('Slane'), findsNothing);
+
+    await tester.tap(find.text('Tim'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('@[Tim] '), findsOneWidget);
+    expect(find.text('Tim'), findsNothing);
+
+    appProvider.dispose();
+    voiceProvider.dispose();
+    imageProvider.dispose();
+    drawingProvider.dispose();
+    mapProvider.dispose();
+    messagesProvider.dispose();
+    contactsProvider.dispose();
+    connectionProvider.dispose();
+    channelsProvider.dispose();
+  });
+
+  testWidgets(
+    'locks messages tab to the configured channel and removes the selector affordance',
+    (tester) async {
+      final lockedChannel = buildContact(
+        name: '#ops',
+        type: ContactType.channel,
+        secondByte: 2,
+      );
+      SharedPreferences.setMockInitialValues({
+        'message_locked_destination_enabled': true,
+        'message_locked_destination_type':
+            MessageDestinationPreferences.destinationTypeChannel,
+        'message_locked_recipient_public_key': lockedChannel.publicKeyHex,
+      });
+
+      final connectionProvider = ConnectionProvider();
+      final contactsProvider = ContactsProvider();
+      final messagesProvider = MessagesProvider();
+      final mapProvider = MapProvider();
+      final drawingProvider = DrawingProvider();
+      await messagesProvider.initialize();
+      await drawingProvider.initialize();
+      final channelsProvider = ChannelsProvider()..initializePublicChannel();
+      final voiceProvider = VoiceProvider(
+        codec: VoiceCodecService(),
+        player: VoicePlayerService(),
+      );
+      final imageProvider = ip.ImageProvider();
+      final appProvider = AppProvider(
+        connectionProvider: connectionProvider,
+        contactsProvider: contactsProvider,
+        messagesProvider: messagesProvider,
+        drawingProvider: drawingProvider,
+        channelsProvider: channelsProvider,
+        voiceProvider: voiceProvider,
+        imageProvider: imageProvider,
+      );
+
+      contactsProvider.addContacts([lockedChannel]);
+      messagesProvider.addMessage(
+        Message(
+          id: 'public-message',
+          messageType: MessageType.channel,
+          pathLen: 1,
+          textType: MessageTextType.plain,
+          senderTimestamp: 1700000200,
+          text: 'Public chatter',
+          receivedAt: DateTime.now(),
+          channelIdx: 0,
+        ),
+      );
+      messagesProvider.addMessage(
+        Message(
+          id: 'locked-message',
+          messageType: MessageType.channel,
+          pathLen: 1,
+          textType: MessageTextType.plain,
+          senderTimestamp: 1700000201,
+          text: 'Ops chatter',
+          receivedAt: DateTime.now(),
+          channelIdx: 2,
+        ),
+      );
+
+      await tester.pumpWidget(
+        MultiProvider(
+          providers: [
+            ChangeNotifierProvider.value(value: connectionProvider),
+            ChangeNotifierProvider.value(value: contactsProvider),
+            ChangeNotifierProvider.value(value: messagesProvider),
+            ChangeNotifierProvider.value(value: mapProvider),
+            ChangeNotifierProvider.value(value: drawingProvider),
+            ChangeNotifierProvider.value(value: channelsProvider),
+            ChangeNotifierProvider.value(value: voiceProvider),
+            ChangeNotifierProvider.value(value: imageProvider),
+            ChangeNotifierProvider.value(value: appProvider),
+          ],
+          child: MaterialApp(
+            localizationsDelegates: AppLocalizations.localizationsDelegates,
+            supportedLocales: AppLocalizations.supportedLocales,
+            home: const Scaffold(body: MessagesTab(isActive: true)),
+          ),
+        ),
+      );
+
+      await tester.pumpAndSettle();
+
+      expect(find.text('Ops chatter'), findsOneWidget);
+      expect(find.text('Public chatter'), findsNothing);
+      expect(
+        find.byKey(const ValueKey('messages_composer_destination_locked')),
+        findsOneWidget,
+      );
+      expect(
+        find.byKey(const ValueKey('messages_composer_destination_selector')),
+        findsNothing,
+      );
+
+      appProvider.dispose();
+      voiceProvider.dispose();
+      imageProvider.dispose();
+      drawingProvider.dispose();
+      mapProvider.dispose();
+      messagesProvider.dispose();
+      contactsProvider.dispose();
+      connectionProvider.dispose();
+      channelsProvider.dispose();
+    },
+  );
+
+  testWidgets(
+    'contact navigation temporarily overrides the lock while keeping the selector hidden',
+    (tester) async {
+      final directContact = buildContact(
+        name: 'Tim',
+        type: ContactType.chat,
+        secondByte: 9,
+      );
+      SharedPreferences.setMockInitialValues({
+        'message_locked_destination_enabled': true,
+        'message_locked_destination_type':
+            MessageDestinationPreferences.destinationTypeChannel,
+      });
+
+      final connectionProvider = ConnectionProvider();
+      final contactsProvider = ContactsProvider();
+      final messagesProvider = MessagesProvider();
+      final mapProvider = MapProvider();
+      final drawingProvider = DrawingProvider();
+      await messagesProvider.initialize();
+      await drawingProvider.initialize();
+      final channelsProvider = ChannelsProvider()..initializePublicChannel();
+      final voiceProvider = VoiceProvider(
+        codec: VoiceCodecService(),
+        player: VoicePlayerService(),
+      );
+      final imageProvider = ip.ImageProvider();
+      final appProvider = AppProvider(
+        connectionProvider: connectionProvider,
+        contactsProvider: contactsProvider,
+        messagesProvider: messagesProvider,
+        drawingProvider: drawingProvider,
+        channelsProvider: channelsProvider,
+        voiceProvider: voiceProvider,
+        imageProvider: imageProvider,
+      );
+
+      contactsProvider.addContacts([directContact]);
+      messagesProvider.addMessage(
+        Message(
+          id: 'public-message',
+          messageType: MessageType.channel,
+          pathLen: 1,
+          textType: MessageTextType.plain,
+          senderTimestamp: 1700000300,
+          text: 'Public chatter',
+          receivedAt: DateTime.now(),
+          channelIdx: 0,
+        ),
+      );
+      messagesProvider.addMessage(
+        Message(
+          id: 'direct-message',
+          messageType: MessageType.contact,
+          senderPublicKeyPrefix: directContact.publicKey.sublist(0, 6),
+          pathLen: 1,
+          textType: MessageTextType.plain,
+          senderTimestamp: 1700000301,
+          text: 'Direct chatter',
+          receivedAt: DateTime.now(),
+        ),
+      );
+      messagesProvider.navigateToDestination(
+        MessageDestinationPreferences.destinationTypeContact,
+        recipientPublicKeyHex: directContact.publicKeyHex,
+      );
+
+      await tester.pumpWidget(
+        MultiProvider(
+          providers: [
+            ChangeNotifierProvider.value(value: connectionProvider),
+            ChangeNotifierProvider.value(value: contactsProvider),
+            ChangeNotifierProvider.value(value: messagesProvider),
+            ChangeNotifierProvider.value(value: mapProvider),
+            ChangeNotifierProvider.value(value: drawingProvider),
+            ChangeNotifierProvider.value(value: channelsProvider),
+            ChangeNotifierProvider.value(value: voiceProvider),
+            ChangeNotifierProvider.value(value: imageProvider),
+            ChangeNotifierProvider.value(value: appProvider),
+          ],
+          child: MaterialApp(
+            localizationsDelegates: AppLocalizations.localizationsDelegates,
+            supportedLocales: AppLocalizations.supportedLocales,
+            home: const Scaffold(body: MessagesTab(isActive: true)),
+          ),
+        ),
+      );
+
+      await tester.pumpAndSettle();
+
+      expect(find.text('Direct chatter'), findsOneWidget);
+      expect(find.text('Public chatter'), findsNothing);
+      expect(
+        find.byKey(const ValueKey('messages_composer_destination_locked')),
+        findsOneWidget,
+      );
+      expect(
+        find.byKey(const ValueKey('messages_composer_destination_selector')),
+        findsNothing,
+      );
+
+      appProvider.dispose();
+      voiceProvider.dispose();
+      imageProvider.dispose();
+      drawingProvider.dispose();
+      mapProvider.dispose();
+      messagesProvider.dispose();
+      contactsProvider.dispose();
+      connectionProvider.dispose();
+      channelsProvider.dispose();
+    },
+  );
+}

test/screens/sensors_tab_test.dart

@@ -0,0 +1,122 @@
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:meshcore_sar_app/l10n/app_localizations.dart';
+import 'package:meshcore_sar_app/models/contact.dart';
+import 'package:meshcore_sar_app/screens/sensors_tab.dart';
+import 'package:meshcore_sar_app/widgets/sensors/sensor_telemetry_card.dart';
+
+void main() {
+  Contact buildSensorContact({
+    int firstByte = 0x44,
+    String name = 'WX Station',
+  }) {
+    final publicKey = Uint8List(32);
+    publicKey[0] = firstByte;
+
+    return Contact(
+      publicKey: publicKey,
+      type: ContactType.sensor,
+      flags: 0,
+      outPathLen: 0,
+      outPath: Uint8List(64),
+      advName: name,
+      lastAdvert: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      advLat: 0,
+      advLon: 0,
+      lastMod: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      telemetry: ContactTelemetry(
+        batteryPercentage: 84,
+        temperature: 21.5,
+        extraSensorData: const {
+          '__source_channel:battery': 1,
+          '__source_channel:temperature': 1,
+          'illuminance_2': 500.0,
+        },
+        timestamp: DateTime.now().subtract(const Duration(minutes: 1)),
+      ),
+    );
+  }
+
+  testWidgets('metric selector item shows channel-specific preview', (
+    tester,
+  ) async {
+    final contact = buildSensorContact();
+    final option = sensorMetricOptionsFor(contact, labelOverrides: const {})
+        .firstWhere(
+          (entry) => entry.key.contains('illuminance') && entry.channel == 2,
+        );
+
+    await tester.pumpWidget(
+      MaterialApp(
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: Scaffold(
+          body: SensorMetricSelectorItem(
+            option: option,
+            visible: true,
+            span: 1,
+            canMoveUp: false,
+            canMoveDown: false,
+            onToggle: (_) {},
+            onRename: () {},
+            onSpanChanged: (_) {},
+          ),
+        ),
+      ),
+    );
+    await tester.pump();
+
+    expect(
+      find.byKey(ValueKey('sensor_selector_metric_${option.key}')),
+      findsOneWidget,
+    );
+    expect(find.text('Channel 2'), findsOneWidget);
+  });
+
+  testWidgets('add sensor sheet keeps close action available when scrolled', (
+    tester,
+  ) async {
+    tester.view.physicalSize = const Size(320, 480);
+    tester.view.devicePixelRatio = 1;
+    addTearDown(tester.view.reset);
+
+    var didClose = false;
+    final candidates = List<Contact>.generate(
+      20,
+      (index) =>
+          buildSensorContact(firstByte: index + 1, name: 'Sensor ${index + 1}'),
+    );
+
+    await tester.pumpWidget(
+      MaterialApp(
+        localizationsDelegates: AppLocalizations.localizationsDelegates,
+        supportedLocales: AppLocalizations.supportedLocales,
+        home: Scaffold(
+          body: AddSensorSheet(
+            candidates: candidates,
+            onSelect: (_) async {},
+            onClose: () {
+              didClose = true;
+            },
+          ),
+        ),
+      ),
+    );
+    await tester.pump();
+
+    final closeButton = find.byTooltip('Close');
+    expect(closeButton, findsOneWidget);
+
+    await tester.drag(find.byType(ListView).last, const Offset(0, -600));
+    await tester.pump();
+
+    expect(closeButton, findsOneWidget);
+
+    await tester.tap(closeButton);
+    await tester.pump();
+
+    expect(didClose, isTrue);
+  });
+}