75 lines
2.8 KiB
Dart
75 lines
2.8 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter_test/flutter_test.dart';
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/// The accent stripe on the Bookings stop card is a `Container` with a width
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/// and no height, laid out by `Row(crossAxisAlignment: stretch)`. That idiom is
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/// a trap inside a `ListView`: stretch sizes children to the Row's own
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/// cross-axis extent, which in a scrollable is UNBOUNDED, so the stripe is
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/// asked to be infinitely tall and the entire card fails to lay out.
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///
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/// It fails silently in the worst possible way — the progress rail above the
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/// list is a separate widget reading the same data, so it kept showing the
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/// right stop count while every card rendered as nothing. That looked exactly
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/// like "the bookings data is broken", and three rounds of data fixes chased
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/// it before the layout was suspected.
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///
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/// PickupCard itself is private to the `pickups.dart` library and cannot be
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/// imported, so these tests pin the idiom rather than the widget.
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void main() {
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Widget inList(Widget child) => MaterialApp(
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home: Scaffold(
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body: ListView(children: [child]),
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),
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);
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Widget stripeRow({required bool withIntrinsicHeight}) {
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final row = Row(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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Container(width: 4, color: const Color(0xFF960019)),
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const Expanded(
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child: Padding(
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padding: EdgeInsets.all(12),
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child: Text('Sri Balaji Stores\n19, Thadagam Road'),
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),
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),
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],
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);
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return Container(
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margin: const EdgeInsets.all(8),
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child: ClipRRect(
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borderRadius: BorderRadius.circular(15),
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child: withIntrinsicHeight ? IntrinsicHeight(child: row) : row,
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),
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);
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}
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testWidgets('a stretch Row with a height-less child breaks in a ListView',
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(tester) async {
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await tester.pumpWidget(inList(stripeRow(withIntrinsicHeight: false)));
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expect(tester.takeException(), isNotNull,
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reason: 'this is the shape that made every stop card disappear');
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});
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testWidgets('IntrinsicHeight gives stretch something finite to stretch to',
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(tester) async {
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await tester.pumpWidget(inList(stripeRow(withIntrinsicHeight: true)));
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expect(tester.takeException(), isNull);
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// And the card has real height — an invisible zero-height card would pass
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// an exception check while still showing the rider nothing.
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final size = tester.getSize(find.byType(IntrinsicHeight));
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expect(size.height, greaterThan(20));
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// The stripe spans the full card height rather than collapsing.
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final stripe = tester.getSize(
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find.descendant(
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of: find.byType(IntrinsicHeight),
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matching: find.byType(Container),
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).first,
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);
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expect(stripe.height, size.height);
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expect(stripe.width, 4);
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});
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}
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