Automatic generation of Timestamp for Positioned.fromMap if it is not… (#1411)

* Automatic generation of Timestamp for Positioned.fromMap if it is not existent

* Added test - does not pass

* Moved test to the proper location

* Update geolocator_platform_interface_test.dart

Author: guplem

geolocator_platform_interface/lib/src/models/position.dart

@@ -141,9 +141,14 @@ class Position {
           'The supplied map doesn\'t contain the mandatory key `longitude`.');
     }
 
-    final timestamp = DateTime.fromMillisecondsSinceEpoch(
-        positionMap['timestamp'].toInt(),
-        isUtc: true);
+    // Assume that the timestamp is null if the map does not contain one
+    dynamic timestampInMap = positionMap['timestamp'];
+    final timestamp = timestampInMap == null
+        ? DateTime.now()
+        : DateTime.fromMillisecondsSinceEpoch(
+            timestampInMap.toInt(),
+            isUtc: true,
+          );
 
     return Position(
       latitude: positionMap['latitude'],

geolocator_platform_interface/pubspec.yaml

@@ -3,7 +3,7 @@ description: A common platform interface for the geolocator plugin.
 repository: https://github.com/baseflow/flutter-geolocator/tree/main/geolocator_platform_interface
 # NOTE: We strongly prefer non-breaking changes, even at the expense of a
 # less-clean API. See https://flutter.dev/go/platform-interface-breaking-changes
-version: 4.2.0
+version: 4.2.1
 
 dependencies:
   flutter:

geolocator_platform_interface/test/geolocator_platform_interface_test.dart

@@ -324,6 +324,15 @@ void main() {
 
       expect(bearing, -90.0);
     });
+
+    test('generate Position object from map without timestamp', () async {
+      final Position position = Position.fromMap({
+        'latitude': 0.0,
+        'longitude': 0.0,
+      });
+
+      expect(position, isNotNull);
+    });
   });
 }