[google_maps_flutter] Adds traffic layer tests

Author: josh-burton

packages/google_maps_flutter/android/src/main/java/io/flutter/plugins/googlemaps/GoogleMapController.java

@@ -329,6 +329,11 @@ public void onMethodCall(MethodCall call, MethodChannel.Result result) {
           result.success(googleMap.getUiSettings().isMyLocationButtonEnabled());
           break;
         }
+      case "map#isTrafficEnabled":
+        {
+          result.success(googleMap.isTrafficEnabled());
+          break;
+        }
       case "map#setStyle":
         {
           String mapStyle = (String) call.arguments;

packages/google_maps_flutter/example/test_driver/google_map_inspector.dart

@@ -49,4 +49,8 @@ class GoogleMapInspector {
   Future<bool> isMyLocationButtonEnabled() async {
     return await _channel.invokeMethod<bool>('map#isMyLocationButtonEnabled');
   }
+
+  Future<bool> isTrafficEnabled() async {
+    return await _channel.invokeMethod<bool>('map#isTrafficEnabled');
+  }
 }

packages/google_maps_flutter/example/test_driver/google_maps.dart

@@ -375,6 +375,31 @@ void main() {
     expect(secondVisibleRegion.contains(newCenter), isTrue);
   });
 
+  test('testTraffic', () async {
+    final Key key = GlobalKey();
+    final Completer<GoogleMapInspector> inspectorCompleter =
+        Completer<GoogleMapInspector>();
+
+    await pumpWidget(Directionality(
+      textDirection: TextDirection.ltr,
+      child: GoogleMap(
+        key: key,
+        initialCameraPosition: _kInitialCameraPosition,
+        trafficEnabled: true,
+        onMapCreated: (GoogleMapController controller) {
+          final GoogleMapInspector inspector =
+              // ignore: invalid_use_of_visible_for_testing_member
+              GoogleMapInspector(controller.channel);
+          inspectorCompleter.complete(inspector);
+        },
+      ),
+    ));
+
+    final GoogleMapInspector inspector = await inspectorCompleter.future;
+    final bool isTrafficEnabled = await inspector.isTrafficEnabled();
+    expect(isTrafficEnabled, true);
+  });
+
   test('testMyLocationButtonToggle', () async {
     final Key key = GlobalKey();
     final Completer<GoogleMapInspector> inspectorCompleter =

packages/google_maps_flutter/ios/Classes/GoogleMapController.m

@@ -229,6 +229,9 @@ - (void)onMethodCall:(FlutterMethodCall*)call result:(FlutterResult)result {
   } else if ([call.method isEqualToString:@"map#isMyLocationButtonEnabled"]) {
     NSNumber* isMyLocationButtonEnabled = @(_mapView.settings.myLocationButton);
     result(isMyLocationButtonEnabled);
+  } else if ([call.method isEqualToString:@"map#isTrafficEnabled"]) {
+    NSNumber* isTrafficEnabled = @(_mapView.trafficEnabled);
+    result(isTrafficEnabled);
   } else if ([call.method isEqualToString:@"map#setStyle"]) {
     NSString* mapStyle = [call arguments];
     NSString* error = [self setMapStyle:mapStyle];

packages/google_maps_flutter/test/fake_maps_controllers.dart

@@ -47,6 +47,8 @@ class FakePlatformGoogleMap {
 
   bool myLocationEnabled;
 
+  bool trafficEnabled;
+
   bool myLocationButtonEnabled;
 
   List<dynamic> padding;
@@ -341,6 +343,9 @@ class FakePlatformGoogleMap {
     if (options.containsKey('myLocationButtonEnabled')) {
       myLocationButtonEnabled = options['myLocationButtonEnabled'];
     }
+    if (options.containsKey('trafficEnabled')) {
+      trafficEnabled = options['trafficEnabled'];
+    }
     if (options.containsKey('padding')) {
       padding = options['padding'];
     }

packages/google_maps_flutter/test/google_map_test.dart

@@ -498,4 +498,33 @@ void main() {
 
     expect(platformGoogleMap.padding, <double>[60, 50, 80, 70]);
   });
+
+  testWidgets('Can update traffic', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: GoogleMap(
+          initialCameraPosition: CameraPosition(target: LatLng(10.0, 15.0)),
+          trafficEnabled: false,
+        ),
+      ),
+    );
+
+    final FakePlatformGoogleMap platformGoogleMap =
+        fakePlatformViewsController.lastCreatedView;
+
+    expect(platformGoogleMap.trafficEnabled, false);
+
+    await tester.pumpWidget(
+      const Directionality(
+        textDirection: TextDirection.ltr,
+        child: GoogleMap(
+          initialCameraPosition: CameraPosition(target: LatLng(10.0, 15.0)),
+          trafficEnabled: true,
+        ),
+      ),
+    );
+
+    expect(platformGoogleMap.trafficEnabled, true);
+  });
 }