Re-add tests deleted by accident

shell/platform/darwin/macos/framework/Source/FlutterEngineTest.mm

@@ -1097,6 +1097,57 @@ + (void)registerWithRegistrar:(id<FlutterPluginRegistrar>)registrar {
   [NSApplication sharedApplication].delegate = previousDelegate;
 }
 
+TEST_F(FlutterEngineTest, RunWithEntrypointUpdatesDisplayConfig) {
+  BOOL updated = NO;
+  FlutterEngine* engine = GetFlutterEngine();
+  auto original_update_displays = engine.embedderAPI.NotifyDisplayUpdate;
+  engine.embedderAPI.NotifyDisplayUpdate = MOCK_ENGINE_PROC(
+      NotifyDisplayUpdate, ([&updated, &original_update_displays](
+                                auto engine, auto update_type, auto* displays, auto display_count) {
+        updated = YES;
+        return original_update_displays(engine, update_type, displays, display_count);
+      }));
+
+  EXPECT_TRUE([engine runWithEntrypoint:@"main"]);
+  EXPECT_TRUE(updated);
+
+  updated = NO;
+  [[NSNotificationCenter defaultCenter]
+      postNotificationName:NSApplicationDidChangeScreenParametersNotification
+                    object:nil];
+  EXPECT_TRUE(updated);
+}
+
+TEST_F(FlutterEngineTest, NotificationsUpdateDisplays) {
+  BOOL updated = NO;
+  FlutterEngine* engine = GetFlutterEngine();
+  auto original_set_viewport_metrics = engine.embedderAPI.SendWindowMetricsEvent;
+  engine.embedderAPI.SendWindowMetricsEvent = MOCK_ENGINE_PROC(
+      SendWindowMetricsEvent,
+      ([&updated, &original_set_viewport_metrics](auto engine, auto* window_metrics) {
+        updated = YES;
+        return original_set_viewport_metrics(engine, window_metrics);
+      }));
+
+  EXPECT_TRUE([engine runWithEntrypoint:@"main"]);
+
+  updated = NO;
+  [[NSNotificationCenter defaultCenter] postNotificationName:NSWindowDidChangeScreenNotification
+                                                      object:nil];
+  // No VC.
+  EXPECT_FALSE(updated);
+
+  FlutterViewController* viewController = [[FlutterViewController alloc] initWithEngine:engine
+                                                                                nibName:nil
+                                                                                 bundle:nil];
+  [viewController loadView];
+  viewController.flutterView.frame = CGRectMake(0, 0, 800, 600);
+
+  [[NSNotificationCenter defaultCenter] postNotificationName:NSWindowDidChangeScreenNotification
+                                                      object:nil];
+  EXPECT_TRUE(updated);
+}
+
 }  // namespace flutter::testing
 
 // NOLINTEND(clang-analyzer-core.StackAddressEscape)