fix: Prevent invalid map bounds #123

test/models/custom_map_config_test.dart

@@ -0,0 +1,37 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:latlong2/latlong.dart';
+import 'package:meshcore_sar_app/models/custom_map_config.dart';
+
+void main() {
+  test('displayBounds stays within valid LatLng limits for tall images', () {
+    const config = CustomMapConfig(
+      filePath: '/tmp/map.png',
+      displayName: 'Tall Map',
+      mapId: 'map-id',
+      imageWidth: 2400,
+      imageHeight: 3213,
+    );
+
+    expect(config.displayBounds.north, lessThanOrEqualTo(90));
+    expect(config.displayBounds.south, greaterThanOrEqualTo(-90));
+    expect(config.displayBounds.east, lessThanOrEqualTo(180));
+    expect(config.displayBounds.west, greaterThanOrEqualTo(-180));
+  });
+
+  test('display point conversion preserves stored coordinates', () {
+    const config = CustomMapConfig(
+      filePath: '/tmp/map.png',
+      displayName: 'Tall Map',
+      mapId: 'map-id',
+      imageWidth: 2400,
+      imageHeight: 3213,
+    );
+    const storedPoint = LatLng(1600, 1200);
+
+    final displayPoint = config.toDisplayPoint(storedPoint);
+    final roundTrip = config.fromDisplayPoint(displayPoint);
+
+    expect(roundTrip.latitude, closeTo(storedPoint.latitude, 0.001));
+    expect(roundTrip.longitude, closeTo(storedPoint.longitude, 0.001));
+  });
+}

test/services/mesh_map_nodes_service_test.dart

@@ -94,4 +94,37 @@ void main() {
     expect(await MeshMapNodesService.loadCachedNodes(), isEmpty);
     expect(await MeshMapNodesService.cachedAt(), isNull);
   });
+
+  test('fetchNodes ignores nodes with invalid coordinates', () async {
+    final client = MockClient(
+      (_) async => http.Response(
+        jsonEncode({
+          'nodes': [
+            {
+              'type': 1,
+              'name': 'Broken',
+              'public_key': 'bad123',
+              'latitude': 3213.0,
+              'longitude': 14.50,
+              'updated_at': 123456,
+            },
+            {
+              'type': 1,
+              'name': 'Alpha',
+              'public_key': 'aa11bb22',
+              'latitude': 46.05,
+              'longitude': 14.50,
+              'updated_at': 123456,
+            },
+          ],
+        }),
+        200,
+      ),
+    );
+
+    final nodes = await MeshMapNodesService.fetchNodes(client: client);
+
+    expect(nodes, hasLength(1));
+    expect(nodes.first.name, 'Alpha');
+  });
 }