Make sure that an ExpandIcon doesn't crash in 0x0 envrionment #175042
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This pull request adds a test for ExpandIcon in a zero-sized environment. The test currently verifies layout but relies on implicit test teardown for disposal. The review suggests modifying the test to explicitly trigger the dispose method to more robustly test against the original reported crash, in line with the project's guidelines for writing effective tests.
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| testWidgets('Expand icon does not crash at zero area', (WidgetTester tester) async { | ||
| await tester.pumpWidget( | ||
| MaterialApp( | ||
| home: Scaffold( | ||
| body: Center( | ||
| child: SizedBox.shrink(child: ExpandIcon(onPressed: (bool value) {})), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(ExpandIcon)), Size.zero); | ||
| }); |
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This test correctly sets up the zero-size scenario for ExpandIcon. However, it relies on the implicit teardown of the test environment to trigger the dispose() method, which is where the original crash happened. To make the test more robust and clearer about its intent, it's better to explicitly trigger the disposal by pumping a new, empty widget tree. This ensures we are writing an effective test that covers the exact condition that caused the bug.1
testWidgets('Expand icon does not crash at zero area', (WidgetTester tester) async {
await tester.pumpWidget(
MaterialApp(
home: Scaffold(
body: Center(
child: SizedBox.shrink(child: ExpandIcon(onPressed: (bool value) {})),
),
),
),
);
expect(tester.getSize(find.byType(ExpandIcon)), Size.zero);
// Pump an empty widget to trigger disposal and ensure it doesn't crash.
await tester.pumpWidget(const SizedBox.shrink());
});Style Guide References
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dkwingsmt
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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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…r#175042) This is my attempt to handle flutter#6537 for the ExpandIcon widget. Co-authored-by: Tong Mu <[email protected]>
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This is my attempt to handle #6537 for the ExpandIcon widget.