feat: add bottom navigation shell with study/manage/stats/account tabs

test/widget_test.dart

@@ -1,30 +1,44 @@
-// This is a basic Flutter widget test.
-//
-// To perform an interaction with a widget in your test, use the WidgetTester
-// utility in the flutter_test package. For example, you can send tap and scroll
-// gestures. You can also use WidgetTester to find child widgets in the widget
-// tree, read text, and verify that the values of widget properties are correct.
-
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 import 'package:mobile/main.dart';
 
+/// 在导航栏内按标签定位，避免和页面标题的相同文字混淆。
+Finder navLabel(String label) {
+  return find.descendant(
+    of: find.byType(NavigationBar),
+    matching: find.text(label),
+  );
+}
+
 void main() {
-  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
-    // Build our app and trigger a frame.
-    await tester.pumpWidget(const MyApp());
+  testWidgets('底部导航提供学习 / 管理 / 统计 / 账户四个入口', (WidgetTester tester) async {
+    await tester.pumpWidget(const KiriMemoApp());
 
-    // Verify that our counter starts at 0.
-    expect(find.text('0'), findsOneWidget);
-    expect(find.text('1'), findsNothing);
+    expect(find.byType(NavigationBar), findsOneWidget);
+    expect(find.byType(NavigationDestination), findsNWidgets(4));
 
-    // Tap the '+' icon and trigger a frame.
-    await tester.tap(find.byIcon(Icons.add));
-    await tester.pump();
+    for (final String label in <String>['学习', '管理', '统计', '账户']) {
+      expect(navLabel(label), findsOneWidget);
+    }
+  });
 
-    // Verify that our counter has incremented.
-    expect(find.text('0'), findsNothing);
-    expect(find.text('1'), findsOneWidget);
+  testWidgets('默认停留在学习页，点击其它入口会切换', (WidgetTester tester) async {
+    await tester.pumpWidget(const KiriMemoApp());
+
+    NavigationBar bar = tester.widget<NavigationBar>(find.byType(NavigationBar));
+    expect(bar.selectedIndex, 0);
+
+    await tester.tap(navLabel('统计'));
+    await tester.pumpAndSettle();
+
+    bar = tester.widget<NavigationBar>(find.byType(NavigationBar));
+    expect(bar.selectedIndex, 2);
+
+    await tester.tap(navLabel('账户'));
+    await tester.pumpAndSettle();
+
+    bar = tester.widget<NavigationBar>(find.byType(NavigationBar));
+    expect(bar.selectedIndex, 3);
   });
 }