Add more 0x0 size tests part 11 by ahmedsameha1 · Pull Request #186822 · flutter/flutter

ahmedsameha1 · 2026-05-20T18:13:25Z

This is my attempt to handle #6537 for the following widgets:
ConstrainedBox
ConstraintsTransformBox
UnconstrainedBox
FractionallySizedBox
LimitedBox
SizedOverflowBox
Offstage
AspectRatio
IntrinsicWidth
IntrinsicHeight

…ment

gemini-code-assist

Code Review

This pull request adds regression tests across several widget test files to ensure that widgets like AspectRatio, UnconstrainedBox, ConstraintsTransformBox, LimitedBox, Offstage, IntrinsicHeight, ConstrainedBox, FractionallySizedBox, IntrinsicWidth, and SizedOverflowBox do not crash when rendered with zero area. Feedback includes addressing a potential overflow error in the UnconstrainedBox test, shortening redundant test descriptions for consistency, and ensuring the use of const constructors and child widgets in ConstrainedBox tests to align with repository style guides and existing test patterns.

gemini-code-assist · 2026-05-20T18:15:45Z

+ testWidgets('does not crash at zero area', (WidgetTester tester) async {
+ tester.view.physicalSize = Size.zero;
+ addTearDown(tester.view.reset);
+ await tester.pumpWidget(
+ const Directionality(
+ textDirection: TextDirection.ltr,
+ child: Center(child: UnconstrainedBox(child: Placeholder())),
+ ),
+ );
+ expect(tester.getSize(find.byType(UnconstrainedBox)), Size.zero);
+ });


The UnconstrainedBox test will likely fail in debug mode because it triggers an overflow error. UnconstrainedBox removes constraints from its child, so the Placeholder will attempt to be 400x400. Since the UnconstrainedBox itself is constrained to 0x0 by the Center widget, it will report an overflow. To fix this and ensure the test passes while still verifying the "no crash" condition, consider removing the child or using a zero-sized child like SizedBox.shrink().
testWidgets('does not crash at zero area', (WidgetTester tester) async { tester.view.physicalSize =Size.zero; addTearDown(tester.view.reset); await tester.pumpWidget( constDirectionality( textDirection:TextDirection.ltr, child:Center(child:UnconstrainedBox()), ), ); expect(tester.getSize(find.byType(UnconstrainedBox)), Size.zero); });

gemini-code-assist · 2026-05-20T18:15:45Z

 );
 });
+
+ testWidgets('ConstraintsTransformBox does not crash at zero area', (WidgetTester tester) async {


The test description 'ConstraintsTransformBox does not crash at zero area' is redundant since it is already inside a group named 'ConstraintsTransformBox'. For consistency with the newly added UnconstrainedBox test in the same file, consider shortening the description.
testWidgets('does not crash at zero area', (WidgetTester tester) async {

Suggested change
testWidgets('ConstraintsTransformBox does not crash at zero area', (WidgetTester tester) async {
testWidgets('does not crash at zero area', (WidgetTester tester) async {

gemini-code-assist · 2026-05-20T18:15:45Z

+ testWidgets('ConstrainedBox does not crash at zero area', (WidgetTester tester) async {
+ tester.view.physicalSize = Size.zero;
+ addTearDown(tester.view.reset);
+ await tester.pumpWidget(
+ Directionality(
+ textDirection: TextDirection.ltr,
+ child: Center(
+ child: ConstrainedBox(constraints: const BoxConstraints(minWidth: 200, maxWidth: 400)),
+ ),
+ ),
+ );
+ expect(tester.getSize(find.byType(ConstrainedBox)), Size.zero);
+ });


This test is inconsistent with the other tests added in this PR. It is missing const on the widget tree and does not include a child widget. For better consistency and to ensure the layout logic involving children is also exercised at zero size, consider adding a Placeholder child and using const for the widget tree.
testWidgets('ConstrainedBox does not crash at zero area', (WidgetTester tester) async { tester.view.physicalSize =Size.zero; addTearDown(tester.view.reset); await tester.pumpWidget( constDirectionality( textDirection:TextDirection.ltr, child:Center( child:ConstrainedBox( constraints:BoxConstraints(minWidth:200, maxWidth:400), child:Placeholder(), ), ), ), ); expect(tester.getSize(find.byType(ConstrainedBox)), Size.zero); });
References
Optimize for readability and follow language idioms like using const constructors where possible. ^(link)

Piinks

LGTM

Piinks

Still LGTM. :) Thanks for resolving that merge conflict!

auto-submit · 2026-05-27T17:37:53Z

autosubmit label was removed for flutter/flutter/186822, because This PR has not met approval requirements for merging. The PR author is not a member of flutter-hackers and needs 1 more review(s) in order to merge this PR.

Merge guidelines: A PR needs at least one approved review if the author is already part of flutter-hackers or two member reviews if the author is not a member of flutter-hackers before re-applying the autosubmit label. Reviewers: If you left a comment approving, please use the "approve" review action instead.

dkwingsmt

LGTM. Thank you!

dkwingsmt · 2026-06-11T04:50:22Z

 );
 });
+
+ testWidgets('ConstraintsTransformBox does not crash at zero area', (WidgetTester tester) async {


Suggested change
testWidgets('ConstraintsTransformBox does not crash at zero area', (WidgetTester tester) async {
testWidgets('does not crash at zero area', (WidgetTester tester) async {

flutter/flutter@c0a1129...8bdce07 2026-06-11 bernaferrari2@gmail.com Make shape border lerp symmetric (flutter/flutter#187282) 2026-06-11 matt.kosarek@canonical.com Sized to content for regular and dialog windows on win32 (flutter/flutter#186829) 2026-06-11 jason-simmons@users.noreply.github.com Ensure that directory names are typed as strings in the CIPD package YAML file generated by merge_and_upload_debug_symbols.py (flutter/flutter#187813) 2026-06-11 stuartmorgan@google.com Add core-packages to ecosystem triage (flutter/flutter#187796) 2026-06-11 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 8azSyvz57mKcPqTwk... to 2KosSR4ONUjIB7tP_... (flutter/flutter#187842) 2026-06-11 ishaquehassan@gmail.com Document moveStep direction on WidgetController.dragUntilVisible (flutter/flutter#186943) 2026-06-11 ahmedsameha1@gmail.com Add more 0x0 size tests part 11 (flutter/flutter#186822) 2026-06-10 kumarshivam72@gmail.com Fix ShapeDecoration.lerp crash when interpolating between gradient and color (flutter/flutter#187368) 2026-06-10 codedoctor@linwood.dev Reland "Add support for stylus buttons" (flutter/flutter#187629) 2026-06-10 tanyabouman@gmail.com Api docs: typo fix in Navigator (flutter/flutter#187572) 2026-06-10 engine-flutter-autoroll@skia.org Roll Packages from bd297cf to 1b56cde (4 revisions) (flutter/flutter#187784) 2026-06-10 116356835+AbdeMohlbi@users.noreply.github.com Improve docs on MediaQuery: highContrast, invertColors and disableAnimations (flutter/flutter#186614) 2026-06-10 matt.boetger@gmail.com [Android] Test to verify AnnounceSemanticsEvent deprecation warning on API 36 (flutter/flutter#187754) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC louisehsu@google.com,stuartmorgan@google.com on the revert to ensure that a human is aware of the problem. To file a bug in Packages: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md

This is my attempt to handle flutter#6537 for the following widgets: ConstrainedBox ConstraintsTransformBox UnconstrainedBox FractionallySizedBox LimitedBox SizedOverflowBox Offstage AspectRatio IntrinsicWidth IntrinsicHeight --------- Co-authored-by: Tong Mu <dkwingsmt@users.noreply.github.com>

ahmedsameha1 added 10 commits May 16, 2026 19:38

Make sure that a ConstrainedBox doesn't crash in 0x0 environment
e2041af

Make sure that a ConstraintsTransformBox doesn't crash in 0x0 environ…
bd459ae
…ment

Make sure that an UnconstrainedBox doesn't crash in 0x0 environment
ee34635

Make sure that a FractionallySizedBox doesn't crash in 0x0 environment
909d382

Make sure that a LimitedBox doesn't crash in 0x0 environment
7942952

Make sure that a SizedOverflowBox doesn't crash in 0x0 environment
cea0813

Make sure that a Offstage doesn't crash in 0x0 environment
e526649

Make sure that a AspectRatio doesn't crash in 0x0 environment
c63917f

Make sure that a IntrinsicWidth doesn't crash in 0x0 environment
627e70d

Make sure that a IntrinsicHeight doesn't crash in 0x0 environment
ffe5289

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Merge branch 'master' into add_more_0x0_size_tests_part_11
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ahmedsameha1 dismissed stale reviews from Piinks and victorsanni via 7a85ca1May 27, 2026 14:50

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Merge branch 'master' into add_more_0x0_size_tests_part_11
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Roll Flutter from c0a11291aa8c to 8bdce07b84e1 (13 revisions) flutter/packages#11885
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Add more 0x0 size tests part 11 - #186822

Add more 0x0 size tests part 11#186822
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	testWidgets('ConstraintsTransformBox does not crash at zero area', (WidgetTester tester) async {
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