Add test

Author: mono0926

Diff for: example/lib/pages/alert_page.dart

@@ -1,4 +1,5 @@
 import 'package:adaptive_dialog/adaptive_dialog.dart';
+import 'package:example/result_banner.dart';
 import 'package:example/router.dart';
 import 'package:example/util/logger.dart';
 import 'package:flutter/material.dart';
@@ -10,12 +11,21 @@ class AlertPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final resultKey = GlobalObjectKey<ResultBannerState>(context);
+    void updateResult(dynamic result) {
+      resultKey.currentState.updateText(
+        result.toString(),
+      );
+      logger.info(result);
+    }
+
     return Scaffold(
       appBar: AppBar(
         title: Text(pascalCaseFromRouteName(AlertPage.routeName)),
       ),
       body: ListView(
         children: <Widget>[
+          ResultBanner(key: resultKey),
           ListTile(
             title: const Text('OK Dialog'),
             onTap: () async {
@@ -24,7 +34,7 @@ class AlertPage extends StatelessWidget {
                 title: 'Title',
                 message: 'This is message.',
               );
-              logger.info(result);
+              updateResult(result);
             },
           ),
           ListTile(
@@ -37,7 +47,7 @@ class AlertPage extends StatelessWidget {
                 barrierDismissible: false,
               );
               assert(result == OkCancelResult.ok);
-              logger.info(result);
+              updateResult(result);
             },
           ),
           ListTile(

Diff for: example/lib/result_banner.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+
+class ResultBanner extends StatefulWidget {
+  const ResultBanner({Key key}) : super(key: key);
+  @override
+  ResultBannerState createState() => ResultBannerState();
+}
+
+class ResultBannerState extends State<ResultBanner> {
+  var _text = '';
+
+  void updateText(String text) {
+    setState(() {
+      _text = text;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialBanner(
+      content: Text('Result: $_text'),
+      actions: <Widget>[
+        FlatButton(
+          child: Text('Clear'),
+          onPressed: () => updateText(''),
+        )
+      ],
+    );
+  }
+}

Diff for: example/test/alert_dialog_test.dart

@@ -0,0 +1,55 @@
+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility that Flutter provides. 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:example/app.dart';
+import 'package:example/router.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:provider/provider.dart';
+
+void main() {
+  testWidgets('OK Dialog', (tester) async {
+    await _setupTester(tester);
+
+    await tester.tap(find.widgetWithText(ListTile, 'OK Dialog'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Title'), findsOneWidget);
+    expect(find.text('This is message.'), findsOneWidget);
+    await tester.tap(find.widgetWithText(FlatButton, 'OK'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Result: OkCancelResult.ok'), findsOneWidget);
+  });
+
+  testWidgets('OK Dialog (barrierDismissible: false)', (tester) async {
+    await _setupTester(tester);
+
+    await tester.tap(
+        find.widgetWithText(ListTile, 'OK Dialog (barrierDismissible: false)'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Title'), findsOneWidget);
+    expect(find.text('This is message.'), findsOneWidget);
+    await tester.tap(find.widgetWithText(FlatButton, 'OK'));
+    await tester.pumpAndSettle();
+
+    expect(find.text('Result: OkCancelResult.ok'), findsOneWidget);
+  });
+}
+
+Future<void> _setupTester(WidgetTester tester) async {
+  await tester.pumpWidget(MultiProvider(
+    providers: [
+      Provider(create: (context) => Router()),
+    ],
+    child: const App(),
+  ));
+
+  await tester.tap(find.widgetWithText(ListTile, 'Alert'));
+  await tester.pumpAndSettle();
+}