Make sure that a Scaffold doesn't crash in 0x0 environment#177722
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This pull request adds a regression test to ensure Scaffold does not crash when rendered in a 0x0 environment. The test is a great addition, but as implemented, it doesn't fully exercise the code path that caused the original crash. I've left a comment with a suggested change to make the test more effective.
Also, as a minor process note, please remember to include the pre-launch checklist in the pull request description as per the repository's contributing guidelines.
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| testWidgets('Scaffold does not crash at zero area', (WidgetTester tester) async { | ||
| await tester.pumpWidget( | ||
| const MaterialApp( | ||
| home: Center(child: SizedBox.shrink(child: Scaffold())), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(Scaffold)), Size.zero); | ||
| }); |
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The current test uses a Scaffold with no body. This means the code path that was causing the crash (_ScaffoldLayout.performLayout's body layout logic) is not executed, as it's guarded by if (hasChild(_ScaffoldSlot.body)). To properly test the fix and prevent regressions, the Scaffold should have at least a body.
Including an appBar would make the test more robust by ensuring layout calculations with non-zero contentTop are also tested under 0x0 size conditions, which was part of the original issue.
Suggested change
| testWidgets('Scaffold does not crash at zero area', (WidgetTester tester) async { | |
| await tester.pumpWidget( | |
| const MaterialApp( | |
| home: Center(child: SizedBox.shrink(child: Scaffold())), | |
| ), | |
| ); | |
| expect(tester.getSize(find.byType(Scaffold)), Size.zero); | |
| }); | |
| testWidgets('Scaffold does not crash at zero area', (WidgetTester tester) async { | |
| await tester.pumpWidget( | |
| const MaterialApp( | |
| home: Center(child: SizedBox.shrink(child: Scaffold(body: SizedBox(), appBar: AppBar()))), | |
| ), | |
| ); | |
| expect(tester.getSize(find.byType(Scaffold)), Size.zero); | |
| }); |
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Checklist:
- The test is in the correct file
- The test name goes “does not crash at zero area”
- The target widget is wrapped by
Center(or is fullscreen) - The target widget does not have an overlay, or the overlay is tested
- The target widget is expected to have a size of exactly
Size.zero
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…77722) This is my attempt to handle flutter#6537 for the Scaffold widget.
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This is my attempt to handle #6537 for the Scaffold widget.