test: Add tests around state and on exit

packages/go_router/test/on_exit_test.dart

@@ -244,7 +244,7 @@ void main() {
     expect(await router.routerDelegate.popRoute(), false);
   });
 
-  testWidgets('It should provide the correct state to the onExit callback',
+  testWidgets('It should provide the correct uri to the onExit callback',
       (WidgetTester tester) async {
     final UniqueKey home = UniqueKey();
     final UniqueKey page1 = UniqueKey();
@@ -314,4 +314,161 @@ void main() {
     expect(find.byKey(home), findsOneWidget);
     expect(onExitState1.uri.toString(), '/1');
   });
+
+  testWidgets(
+    'It should provide the correct path parameters to the onExit callback',
+    (WidgetTester tester) async {
+      final UniqueKey page0 = UniqueKey();
+      final UniqueKey page1 = UniqueKey();
+      final UniqueKey page2 = UniqueKey();
+      final UniqueKey page3 = UniqueKey();
+      late final GoRouterState onExitState1;
+      late final GoRouterState onExitState2;
+      late final GoRouterState onExitState3;
+      final List<GoRoute> routes = <GoRoute>[
+        GoRoute(
+          path: '/route-0/:id0',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: page0),
+        ),
+        GoRoute(
+          path: '/route-1/:id1',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: page1),
+          onExit: (BuildContext context, GoRouterState state) {
+            onExitState1 = state;
+            return true;
+          },
+        ),
+        GoRoute(
+          path: '/route-2/:id2',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: page2),
+          onExit: (BuildContext context, GoRouterState state) {
+            onExitState2 = state;
+            return true;
+          },
+        ),
+        GoRoute(
+          path: '/route-3/:id3',
+          builder: (BuildContext context, GoRouterState state) {
+            return DummyScreen(key: page3);
+          },
+          onExit: (BuildContext context, GoRouterState state) {
+            onExitState3 = state;
+            return true;
+          },
+        ),
+      ];
+
+      final GoRouter router = await createRouter(
+        routes,
+        tester,
+        initialLocation: '/route-0/0?param0=0',
+      );
+      unawaited(router.push('/route-1/1?param1=1'));
+      unawaited(router.push('/route-2/2?param2=2'));
+      unawaited(router.push('/route-3/3?param3=3'));
+
+      await tester.pumpAndSettle();
+      expect(find.byKey(page3), findsOne);
+
+      router.pop();
+      await tester.pumpAndSettle();
+      expect(find.byKey(page2), findsOne);
+      expect(onExitState3.uri.toString(), '/route-3/3?param3=3');
+      expect(onExitState3.pathParameters, const <String, String>{'id3': '3'});
+      expect(onExitState3.fullPath, '/route-3/:id3');
+
+      router.pop();
+      await tester.pumpAndSettle();
+      expect(find.byKey(page1), findsOne);
+      expect(onExitState2.uri.toString(), '/route-2/2?param2=2');
+      expect(onExitState2.pathParameters, const <String, String>{'id2': '2'});
+      expect(onExitState2.fullPath, '/route-2/:id2');
+
+      router.pop();
+      await tester.pumpAndSettle();
+      expect(find.byKey(page0), findsOne);
+      expect(onExitState1.uri.toString(), '/route-1/1?param1=1');
+      expect(onExitState1.pathParameters, const <String, String>{'id1': '1'});
+      expect(onExitState1.fullPath, '/route-1/:id1');
+    },
+  );
+
+  testWidgets(
+    'It should provide the correct path parameters to the onExit callback during a go',
+    (WidgetTester tester) async {
+      final UniqueKey page0 = UniqueKey();
+      final UniqueKey page1 = UniqueKey();
+      final UniqueKey page2 = UniqueKey();
+      final UniqueKey page3 = UniqueKey();
+      late final GoRouterState onExitState0;
+      late final GoRouterState onExitState1;
+      late final GoRouterState onExitState2;
+      final List<GoRoute> routes = <GoRoute>[
+        GoRoute(
+          path: '/route-0/:id0',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: page0),
+          onExit: (BuildContext context, GoRouterState state) {
+            onExitState0 = state;
+            return true;
+          },
+        ),
+        GoRoute(
+          path: '/route-1/:id1',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: page1),
+          onExit: (BuildContext context, GoRouterState state) {
+            onExitState1 = state;
+            return true;
+          },
+        ),
+        GoRoute(
+          path: '/route-2/:id2',
+          builder: (BuildContext context, GoRouterState state) =>
+              DummyScreen(key: page2),
+          onExit: (BuildContext context, GoRouterState state) {
+            onExitState2 = state;
+            return true;
+          },
+        ),
+        GoRoute(
+          path: '/route-3/:id3',
+          builder: (BuildContext context, GoRouterState state) {
+            return DummyScreen(key: page3);
+          },
+        ),
+      ];
+
+      final GoRouter router = await createRouter(
+        routes,
+        tester,
+        initialLocation: '/route-0/0?param0=0',
+      );
+      expect(find.byKey(page0), findsOne);
+
+      router.go('/route-1/1?param1=1');
+      await tester.pumpAndSettle();
+      expect(find.byKey(page1), findsOne);
+      expect(onExitState0.uri.toString(), '/route-0/0?param0=0');
+      expect(onExitState0.pathParameters, const <String, String>{'id0': '0'});
+      expect(onExitState0.fullPath, '/route-0/:id0');
+
+      router.go('/route-2/2?param2=2');
+      await tester.pumpAndSettle();
+      expect(find.byKey(page2), findsOne);
+      expect(onExitState1.uri.toString(), '/route-1/1?param1=1');
+      expect(onExitState1.pathParameters, const <String, String>{'id1': '1'});
+      expect(onExitState1.fullPath, '/route-1/:id1');
+
+      router.go('/route-3/3?param3=3');
+      await tester.pumpAndSettle();
+      expect(find.byKey(page3), findsOne);
+      expect(onExitState2.uri.toString(), '/route-2/2?param2=2');
+      expect(onExitState2.pathParameters, const <String, String>{'id2': '2'});
+      expect(onExitState2.fullPath, '/route-2/:id2');
+    },
+  );
 }