fix!: Updates for Flutter 3.16.0/Dart 3.2

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}
@@ -67,13 +78,18 @@ class MockNavigator extends Mock
     with _MockNavigatorDiagnosticsMixin
     implements NavigatorState {
   /// {@macro mock_navigator}
-  MockNavigator() {
+  ///
+  /// [canPop()] is automatically stubbed to return the value of
+  /// [initialCanPop].
+  MockNavigator({bool initialCanPop = false}) {
     registerFallbackValue(_FakeRoute<dynamic>());
     registerFallbackValue(_FakeRoute<Object>());
     registerFallbackValue(_FakeRoute<void>());
     registerFallbackValue(_FakeRoute<bool>());
     registerFallbackValue(_FakeRoute<String>());
     registerFallbackValue(_FakeRoute<num>());
+
+    when(canPop).thenReturn(initialCanPop);
   }
 
   final _routes = <_MockMaterialPageRoute>[];

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/mock_navigator_test.dart

@@ -198,6 +198,8 @@ void main() {
         ),
       );
 
+      // Called by NavigatorState.didChangeDependencies initially
+      verify(() => navigator.canPop()).called(1);
       await tester.tap(find.byType(TextButton));
       verify(() => navigator.canPop()).called(1);
     });