[federated_plugin_sample] modify the sample to expose battery API instead of geolocation API (#526)

experimental/federated_plugin/federated_plugin_web/.gitignore

@@ -67,6 +67,9 @@ build/
 **/ios/ServiceDefinitions.json
 **/ios/Runner/GeneratedPluginRegistrant.*
 
+# Web related
+lib/generated_plugin_registrant.dart
+
 # Exceptions to above rules.
 !**/ios/**/default.mode1v3
 !**/ios/**/default.mode2v3

experimental/federated_plugin/federated_plugin_web/lib/federated_plugin_web.dart

@@ -5,17 +5,17 @@
 import 'dart:html' as html;
 
 import 'package:federated_plugin_platform_interface/federated_plugin_platform_interface.dart';
-import 'package:federated_plugin_platform_interface/location_model.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_web_plugins/flutter_web_plugins.dart';
 
-/// Web Implementation of [FederatedPluginInterface] to provide location.
+/// Web Implementation of [FederatedPluginInterface] to retrieve current battery
+/// level of device.
 class FederatedPlugin extends FederatedPluginInterface {
-  final html.Geolocation _geolocation;
+  final html.Navigator _navigator;
 
-  /// Constructor to override the geolocation object for testing purpose.
-  FederatedPlugin({html.Geolocation geolocation})
-      : _geolocation = geolocation ?? html.window.navigator.geolocation;
+  /// Constructor to override the navigator object for testing purpose.
+  FederatedPlugin({html.Navigator navigator})
+      : _navigator = navigator ?? html.window.navigator;
 
   /// Method to register the plugin which sets [FederatedPlugin] to be the default
   /// instance of [FederatedPluginInterface].
@@ -23,21 +23,20 @@ class FederatedPlugin extends FederatedPluginInterface {
     FederatedPluginInterface.instance = FederatedPlugin();
   }
 
-  /// Returns [Location] to provide latitude and longitude.
+  /// Returns the current battery level of device.
   ///
-  /// If any error, it's assume that user has denied the permission forever.
+  /// If any error, it's assume that the BatteryManager API is not supported by
+  /// browser.
   @override
-  Future<Location> getLocation() async {
+  Future<int> getBatteryLevel() async {
     try {
-      final geoPosition = await _geolocation.getCurrentPosition();
-      return Location(
-        longitude: geoPosition.coords.longitude.toDouble(),
-        latitude: geoPosition.coords.latitude.toDouble(),
-      );
+      final battery = await _navigator.getBattery() as html.BatteryManager;
+      // The battery level retrieved is in range of 0.0 to 1.0.
+      return battery.level * 100 as int;
     } catch (error) {
       throw PlatformException(
-        code: 'PERMISSION_DENIED',
-        message: 'Permission denied from User',
+        code: 'STATUS_UNAVAILABLE',
+        message: 'The plugin is not supported by the browser.',
         details: null,
       );
     }

experimental/federated_plugin/federated_plugin_web/pubspec.yaml

@@ -1,5 +1,5 @@
 name: federated_plugin_web
-description: Web implementation of federated_plugin to provide location.
+description: Web implementation of federated_plugin to retrieve current battery level.
 version: 0.0.1
 homepage:
 publish_to: none

experimental/federated_plugin/federated_plugin_web/test_driver/federated_plugin_web_e2e.dart

@@ -9,45 +9,35 @@ import 'package:federated_plugin_web/federated_plugin_web.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/mockito.dart';
 
-const kLatitude = 4;
-const kLongitude = 3;
+const kBatteryLevel = 0.49;
 
-class GeoLocationMock extends Mock implements Geolocation {}
+class NavigatorMock extends Mock implements Navigator {}
 
-class GeoPositionMock extends Mock implements Geoposition {
+class BatteryManagerMock extends Mock implements BatteryManager {
   @override
-  Coordinates get coords => MockCoordinates();
-}
-
-class MockCoordinates extends Mock implements Coordinates {
-  @override
-  num get latitude => kLatitude;
-
-  @override
-  num get longitude => kLongitude;
+  num get level => kBatteryLevel;
 }
 
 void main() {
   E2EWidgetsFlutterBinding.ensureInitialized();
 
   group('FederatedPlugin test', () {
-    final geoLocationMock = GeoLocationMock();
+    final navigatorMock = NavigatorMock();
 
     setUp(() {
-      when(geoLocationMock.getCurrentPosition())
-          .thenAnswer((realInvocation) async => GeoPositionMock());
+      when(navigatorMock.getBattery())
+          .thenAnswer((realInvocation) async => BatteryManagerMock());
     });
 
-    testWidgets('getLocation Method', (tester) async {
-      final federatedPlugin = FederatedPlugin(geolocation: geoLocationMock);
-      final location = await federatedPlugin.getLocation();
+    testWidgets('getBatteryLevel Method', (tester) async {
+      final federatedPlugin = FederatedPlugin(navigator: navigatorMock);
+      final batteryLevel = await federatedPlugin.getBatteryLevel();
 
-      // Verify that getCurrentPosition was called.
-      verify(geoLocationMock.getCurrentPosition());
+      // Verify that getBattery was called.
+      verify(navigatorMock.getBattery());
 
-      // Verify the values of Location.longitude and Location.latitude.
-      expect(location.longitude, kLongitude);
-      expect(location.latitude, kLatitude);
+      // Verify the battery level.
+      expect(batteryLevel, kBatteryLevel * 100);
     });
   });
 }