Make sure that a PopupMenuDivider doesn't crash in 0x0 environment (flutter#177445)

This is my attempt to handle
flutter#6537 for the PopupMenuDivider
widget.

Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

Author: ahmedsameha1

packages/flutter/test/material/popup_menu_test.dart

@@ -4851,6 +4851,15 @@ void main() {
     checkPopupMenu(popupMenuTheme2);
   });
 
+  testWidgets('PopupMenuDivider does not crash at zero area', (WidgetTester tester) async {
+    await tester.pumpWidget(
+      const MaterialApp(
+        home: Center(child: SizedBox.shrink(child: PopupMenuDivider())),
+      ),
+    );
+    expect(tester.getSize(find.byType(PopupMenuDivider)), Size.zero);
+  });
+
   // Regression test for https://github.com/flutter/flutter/issues/177003
   testWidgets('PopupMenu semantics for mismatched platforms', (WidgetTester tester) async {
     Future<void> pumpPopupMenuWithTheme(TargetPlatform themePlatform) async {