fix: Updates for Flutter 3.16.0/Dart 3.2 (#65)

* MockNavigator.canPop() is now stubbed automatically

- Default `false`

* Mock OverlayState during hackOverlays to control `mounted`

* Fixed failing test

* Set flutter to `>=3.16.0` in pubspec.yaml

* Removed default stubbing of `canPop`

* Fixed failing example tests

---------

Co-authored-by: Bas Rops <bas.rops@knowingo.com>

README.md

@@ -77,6 +77,7 @@ class MySettingsPage extends StatelessWidget {
 void main() {
   testWidgets('pushes SettingsPage when TextButton is tapped', (tester) async {
     final navigator = MockNavigator();
+    when(navigator.canPop).thenReturn(true);
     when(() => navigator.push<void>(any())).thenAnswer((_) async {});
 
     await tester.pumpWidget(

example/test/ui/home_screen_test.dart

@@ -24,6 +24,7 @@ void main() {
 
     setUp(() {
       navigator = MockNavigator();
+      when(() => navigator.canPop()).thenReturn(true);
       when(() => navigator.push<String?>(any())).thenAnswer((_) async => null);
       when(
         () => navigator.push<QuizOption>(any()),

example/test/ui/pincode_screen_test.dart

@@ -14,6 +14,7 @@ void main() {
 
     setUp(() {
       navigator = MockNavigator();
+      when(() => navigator.canPop()).thenReturn(true);
     });
 
     testWidgets('.route renders PincodeScreen', (tester) async {

example/test/ui/quiz_dialog_test.dart

@@ -14,6 +14,7 @@ void main() {
 
     setUp(() {
       navigator = MockNavigator();
+      when(() => navigator.canPop()).thenReturn(true);
     });
 
     testWidgets('.show opens dialog', (tester) async {

lib/src/mock_navigator.dart

@@ -6,7 +6,8 @@ class _MockMaterialPageRoute extends MaterialPageRoute<void> {
 
   void hackOverlays() {
     for (var i = 0; i < overlayEntries.length; i++) {
-      final state = OverlayState();
+      // Entry can only be inserted when the state is mounted
+      final state = _MockOverlayState().._mounted = true;
       final entry = OverlayEntry(builder: (_) => const SizedBox());
       try {
         // We need to call insert since that is the only way to populate the
@@ -17,11 +18,21 @@ class _MockMaterialPageRoute extends MaterialPageRoute<void> {
         // so we just ignore the error and the hack will do its job.
         state.insert(entry);
       } catch (_) {}
+      // Set mounted back to false to make sure the state doesn't get
+      // marked as dirty during OverlayEntry.remove().
+      state._mounted = false;
       overlayEntries[i] = entry;
     }
   }
 }
 
+class _MockOverlayState extends OverlayState {
+  late bool _mounted;
+
+  @override
+  bool get mounted => _mounted;
+}
+
 class _FakeRoute<T> extends Fake implements Route<T> {}
 
 /// {@template mock_navigator_provider}

pubspec.yaml

@@ -5,7 +5,7 @@ homepage: https://github.com/VeryGoodOpenSource/mockingjay
 
 environment:
   sdk: ">=2.18.0 <4.0.0"
-  flutter: ">=3.7.3"
+  flutter: ">=3.16.0"
 
 dependencies:
   flutter:

test/src/example_test.dart

@@ -35,6 +35,7 @@ class MySettingsPage extends StatelessWidget {
 void main() {
   testWidgets('pushes SettingsPage when TextButton is tapped', (tester) async {
     final navigator = MockNavigator();
+    when(navigator.canPop).thenReturn(true);
     when(() => navigator.push<void>(any())).thenAnswer((_) async {});
 
     await tester.pumpWidget(

test/src/mock_navigator_test.dart

@@ -45,6 +45,7 @@ void main() {
 
     setUp(() {
       navigator = MockNavigator();
+      when(() => navigator.canPop()).thenReturn(true);
     });
 
     test('toString returns normally', () {
@@ -198,6 +199,8 @@ void main() {
         ),
       );
 
+      // Called by NavigatorState.didChangeDependencies initially
+      verify(() => navigator.canPop()).called(1);
       await tester.tap(find.byType(TextButton));
       verify(() => navigator.canPop()).called(1);
     });