Make sure that a CupertinoDesktopTextSelectionToolbarButton doesn't c… #173894
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Code Review
This pull request adds a regression test for an issue where CupertinoDesktopTextSelectionToolbarButton would crash when rendered in a zero-sized area. The added test correctly reproduces the scenario. My feedback focuses on improving the test's robustness by adding an assertion, as recommended by the Flutter testing guidelines.
Comment on lines
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| await tester.pumpWidget( | ||
| const CupertinoApp( | ||
| home: SizedBox.shrink( | ||
| child: CupertinoDesktopTextSelectionToolbarButton(onPressed: null, child: Text('X')), | ||
| ), | ||
| ), | ||
| ); |
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While this test is great for catching crashes, it's missing an assertion. The Flutter testing guide states that every test should have at least one expect call.1 This ensures the test is actually verifying what it's supposed to and doesn't pass vacuously if the widget isn't rendered at all.
Adding a simple expect to check for the widget's presence would make this test more complete.
await tester.pumpWidget(
const CupertinoApp(
home: SizedBox.shrink(
child: CupertinoDesktopTextSelectionToolbarButton(onPressed: null, child: Text('X')),
),
),
);
expect(find.byType(CupertinoDesktopTextSelectionToolbarButton), findsOneWidget);
Style Guide References
Footnotes
-
Flutter Style Guide, line 10: Writing Effective Tests. ↩
justinmc
approved these changes
Aug 20, 2025
Comment on lines
134
to
142
| await tester.pumpWidget( | ||
| const CupertinoApp( | ||
| home: SizedBox.shrink( | ||
| child: CupertinoDesktopTextSelectionToolbarButton(onPressed: null, child: Text('X')), | ||
| ), | ||
| ), | ||
| ); |
…rash in 0x0 environment
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dkwingsmt
reviewed
Sep 18, 2025
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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
| ), | ||
| ), | ||
| ); | ||
| expect(tester.getSize(find.byType(CupertinoDesktopTextSelectionToolbarButton)).isEmpty, isTrue); |
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Suggested change
| expect(tester.getSize(find.byType(CupertinoDesktopTextSelectionToolbarButton)).isEmpty, isTrue); | |
| expect(tester.getSize(find.byType(CupertinoDesktopTextSelectionToolbarButton)), Size.zero); |
dkwingsmt
reviewed
Sep 18, 2025
Contributor
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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
victorsanni
approved these changes
Sep 22, 2025
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|
autosubmit label was removed for flutter/flutter/173894, because The base commit of the PR is older than 7 days and can not be merged. Please merge the latest changes from the main into this branch and resubmit the PR. |
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Roll Flutter from 6cc976ec26d3 to 96fe3b3df509 (32 revisions) flutter/flutter@6cc976e...96fe3b3 2025-09-29 engine-flutter-autoroll@skia.org Roll Packages from 389c678 to 34eec78 (6 revisions) (flutter/flutter#176205) 2025-09-29 engine-flutter-autoroll@skia.org Roll Skia from 9b2b942d1eb1 to bb3b6bd4be0d (4 revisions) (flutter/flutter#176201) 2025-09-29 bkonyi@google.com [ Widget Preview ] Improve IDE integration support (flutter/flutter#176114) 2025-09-29 robert.ancell@canonical.com Fix name of driver file (flutter/flutter#176186) 2025-09-29 engine-flutter-autoroll@skia.org Roll Skia from beb673968802 to 9b2b942d1eb1 (3 revisions) (flutter/flutter#176190) 2025-09-28 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from 0Z45OXT_Wb8aWI3a0... to 8zjcJic_DtvB2Bo2x... (flutter/flutter#176158) 2025-09-28 flar@google.com Revert "[Impeller] Optimize scale translate rectangle transforms" (flutter/flutter#176161) 2025-09-27 engine-flutter-autoroll@skia.org Roll Skia from 2e5da5c0a9cd to beb673968802 (1 revision) (flutter/flutter#176145) 2025-09-27 flar@google.com [Impeller] Optimize scale translate rectangle transforms (flutter/flutter#176123) 2025-09-27 engine-flutter-autoroll@skia.org Roll Skia from d8422aaf8f89 to 2e5da5c0a9cd (2 revisions) (flutter/flutter#176141) 2025-09-27 mdebbar@google.com [web] Remove mention of non-existent `canvaskit_lock.yaml` (flutter/flutter#176108) 2025-09-27 engine-flutter-autoroll@skia.org Roll Skia from 96b73f61fe61 to d8422aaf8f89 (2 revisions) (flutter/flutter#176118) 2025-09-27 sokolovskyi.konstantin@gmail.com [a11y] Add `expanded` flag support to Android. (flutter/flutter#174981) 2025-09-26 ahmedsameha1@gmail.com Make sure that a DesktopTextSelectionToolbar doesn't crash in 0x0 env… (flutter/flutter#173928) 2025-09-26 engine-flutter-autoroll@skia.org Roll Dart SDK from 899c7340cc4c to af31d2637b6b (11 revisions) (flutter/flutter#176056) 2025-09-26 1063596+reidbaker@users.noreply.github.com Update java version ranges with the top end limitation for java pre 17 (flutter/flutter#176049) 2025-09-26 1063596+reidbaker@users.noreply.github.com Add warn java evaluation to android_workflow (flutter/flutter#176097) 2025-09-26 katelovett@google.com Removes type annotations in templates (flutter/flutter#176106) 2025-09-26 fluttergithubbot@gmail.com Marks Linux_pixel_7pro static_path_stroke_tessellation_perf__timeline_summary to be unflaky (flutter/flutter#175917) 2025-09-26 1063596+reidbaker@users.noreply.github.com Add kotlin/kgp 2.2.* evaluation criteria. (flutter/flutter#176094) 2025-09-26 32538273+ValentinVignal@users.noreply.github.com Migrate to `WidgetStateMouseCursor` (flutter/flutter#175981) 2025-09-26 engine-flutter-autoroll@skia.org Roll Packages from 117bf63 to 389c678 (4 revisions) (flutter/flutter#176092) 2025-09-26 34871572+gmackall@users.noreply.github.com Fix link to .gclient setup instructions (flutter/flutter#176046) 2025-09-26 matt.kosarek@canonical.com Implement Regular Windows for the win32 framework + add an example application for regular windows (flutter/flutter#173715) 2025-09-26 engine-flutter-autoroll@skia.org Roll Skia from 5d99c3fc7c83 to 96b73f61fe61 (3 revisions) (flutter/flutter#176075) 2025-09-26 engine-flutter-autoroll@skia.org Roll Fuchsia Linux SDK from naeytagBIBEpKgZNZ... to 0Z45OXT_Wb8aWI3a0... (flutter/flutter#176068) 2025-09-26 100504385+AlsoShantanuBorkar@users.noreply.github.com Add itemClipBehavior property for CarouselView's children (flutter/flutter#175324) 2025-09-26 engine-flutter-autoroll@skia.org Roll Skia from 55436d87e414 to 5d99c3fc7c83 (4 revisions) (flutter/flutter#176060) 2025-09-26 flar@google.com Revert "[Impeller] Optimize scale translate rectangle transforms" (flutter/flutter#176061) 2025-09-25 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Reapply "Update the AccessibilityPlugin::Announce method to account f… (#174365)" (flutter/flutter#176059) 2025-09-25 ahmedsameha1@gmail.com Make sure that a CupertinoDesktopTextSelectionToolbarButton doesn't c… (flutter/flutter#173894) 2025-09-25 mohellebiabdessalem@gmail.com Improve code quality in `SensitiveContentPluginTest.java` (flutter/flutter#175721) 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 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 ...
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This is my attempt to handle #6537 for the CupertinoDesktopTextSelectionToolbarButton UI control.