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Add regression test for TabBar crash (#144627)
This is a regression test for https://github.com/flutter/flutter/issues/144087 and https://github.com/flutter/flutter/issues/138588. To be submitted after https://github.com/flutter/flutter/pull/144579.
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@ -6993,4 +6993,44 @@ void main() {
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expect(tabTwoRect.right, moreOrLessEquals(tabTwoRight));
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});
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});
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testWidgets('does not crash if switching to a newly added tab', (WidgetTester tester) async {
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// Regression test for https://github.com/flutter/flutter/issues/144087.
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Widget buildTabs(int tabCount) {
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return boilerplate(
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child: DefaultTabController(
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length: tabCount,
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child: Scaffold(
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appBar: AppBar(
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title: const Text('Flutter Demo Click Counter'),
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bottom: TabBar(
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tabAlignment: TabAlignment.start,
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isScrollable: true,
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tabs: List<Widget>.generate(tabCount, (int i) => Tab(text: 'Tab $i')),
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),
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),
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body: TabBarView(
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children: List<Widget>.generate(tabCount, (int i) => Text('View $i')),
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),
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),
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),
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);
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}
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await tester.pumpWidget(buildTabs(1));
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expect(tester.widgetList(find.byType(Tab)), hasLength(1));
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await tester.pumpWidget(buildTabs(2));
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expect(tester.widgetList(find.byType(Tab)), hasLength(2));
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await tester.pumpWidget(buildTabs(3));
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expect(tester.widgetList(find.byType(Tab)), hasLength(3));
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expect(find.text('View 0'), findsOneWidget);
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expect(find.text('View 2'), findsNothing);
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await tester.tap(find.text('Tab 2'));
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await tester.pumpAndSettle();
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expect(find.text('View 0'), findsNothing);
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expect(find.text('View 2'), findsOneWidget);
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});
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}
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