flutter/packages/unit/test/widget/tabs_test.dart

77 lines
2.3 KiB
Dart

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:test/test.dart';
import 'widget_tester.dart';
int selectedIndex = 2;
Widget buildFrame({ List<String> tabs, bool isScrollable: false }) {
return new TabBar(
labels: tabs.map((String tab) => new TabLabel(text: tab)).toList(),
selectedIndex: selectedIndex,
isScrollable: isScrollable,
onChanged: (int tabIndex) {
selectedIndex = tabIndex;
}
);
}
void main() {
test('TabBar tap selects tab', () {
testWidgets((WidgetTester tester) {
List<String> tabs = <String>['A', 'B', 'C'];
selectedIndex = 2;
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: false));
expect(tester.findText('A'), isNotNull);
expect(tester.findText('B'), isNotNull);
expect(tester.findText('C'), isNotNull);
expect(selectedIndex, equals(2));
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: false));
tester.tap(tester.findText('B'));
tester.pump();
expect(selectedIndex, equals(1));
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: false));
tester.tap(tester.findText('C'));
tester.pump();
expect(selectedIndex, equals(2));
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: false));
tester.tap(tester.findText('A'));
tester.pump();
expect(selectedIndex, equals(0));
});
});
test('Scrollable TabBar tap selects tab', () {
testWidgets((WidgetTester tester) {
List<String> tabs = <String>['A', 'B', 'C'];
selectedIndex = 2;
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: true));
expect(tester.findText('A'), isNotNull);
expect(tester.findText('B'), isNotNull);
expect(tester.findText('C'), isNotNull);
expect(selectedIndex, equals(2));
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: true));
tester.tap(tester.findText('B'));
tester.pump();
expect(selectedIndex, equals(1));
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: true));
tester.tap(tester.findText('C'));
tester.pump();
expect(selectedIndex, equals(2));
tester.pumpWidget(buildFrame(tabs: tabs, isScrollable: true));
tester.tap(tester.findText('A'));
tester.pump();
expect(selectedIndex, equals(0));
});
});
}