Make sure that CupertinoNavigationBar doesn't crash in 0x0 environment #179235
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This pull request adds a regression test to ensure CupertinoNavigationBar does not crash when placed in a zero-sized environment. The test is a good addition to prevent future regressions. However, the original issue seems to be related to _RenderLargeTitle, which is used by CupertinoNavigationBar.large. The added test only covers the standard CupertinoNavigationBar. I recommend adding another test case for CupertinoNavigationBar.large to fully cover the reported issue.
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| testWidgets('CupertinoNavigationBar does not crash at zero area', (WidgetTester tester) async { | ||
| await tester.pumpWidget( | ||
| const CupertinoApp( | ||
| home: Center(child: SizedBox.shrink(child: CupertinoNavigationBar())), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(CupertinoNavigationBar)), Size.zero); | ||
| }); |
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This test covers the standard CupertinoNavigationBar, which is great. However, the issue you're referencing (#6537) specifically mentions a crash within _RenderLargeTitle, which is used by CupertinoNavigationBar.large. To ensure the fix is fully covered and prevent regressions, it would be beneficial to add a similar test case for CupertinoNavigationBar.large.
Here's a suggestion for the additional test:
testWidgets('CupertinoNavigationBar does not crash at zero area', (WidgetTester tester) async {
await tester.pumpWidget(
const CupertinoApp(
home: Center(child: SizedBox.shrink(child: CupertinoNavigationBar())),
),
);
expect(tester.getSize(find.byType(CupertinoNavigationBar)), Size.zero);
});
testWidgets('CupertinoNavigationBar.large does not crash at zero area', (WidgetTester tester) async {
await tester.pumpWidget(
const CupertinoApp(
home: Center(child: SizedBox.shrink(child: CupertinoNavigationBar.large(largeTitle: Text('Title')))),
),
);
expect(tester.getSize(find.byType(CupertinoNavigationBar)), Size.zero);
});
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Maybe try passing the navigation bar into a CupertinoPageScaffold.navigationBar?
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tester.view.physicalSize = Size.zero;
addTearDown(tester.view.reset);
await tester.pumpWidget(
const CupertinoApp(
home: Center(
child: CupertinoPageScaffold(navigationBar: CupertinoNavigationBar(), child: SizedBox()),
),
),
);fails with: Expected: Size:<Size(0.0, 0.0)>
Actual: _DebugSize:<Size(0.0, 44.0)>
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I see, I think we can leave it out. Internally we give the navigation bar a fixed height to make it play nicely with the scaffold.
victorsanni
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Dec 5, 2025
dkwingsmt
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Dec 5, 2025
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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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flutter#179235) This is my attempt to handle flutter#6537 for the CupertinoNavigationBar widget. Co-authored-by: Tong Mu <[email protected]>
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This is my attempt to handle #6537 for the CupertinoNavigationBar widget.