improve: better integration_test structure.

example/integration_test/01.dart

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+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:app/01_simple_text_sample/main.dart' as example01;
+
+void test(){
+
+  testWidgets('simple text', (tester) async {
+    example01.main();
+    await tester.pumpAndSettle();
+
+    expect(find.text(''), findsNWidgets(2));
+    expect(find.text('0'), findsOneWidget);
+
+    await tester.tap(find.text('0'));
+    await tester.pumpAndSettle(); // Trigger a frame.
+
+    expect(find.text('a'), findsNWidgets(2));
+    expect(find.text('1'), findsOneWidget);
+
+    await tester.tap(find.text('1'));
+    await tester.pumpAndSettle(); // Trigger a frame.
+
+    expect(find.text('aa'), findsNWidgets(2));
+    expect(find.text('2'), findsOneWidget);
+  });
+}

example/integration_test/02.dart

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+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:app/02_object_apply_sample/main.dart' as example02;
+
+void test(){
+
+  testWidgets('object apply', (tester) async {
+    example02.main();
+    await tester.pumpAndSettle();
+
+    expect(find.text('Ali is 24 years old.'), findsOneWidget);
+
+    await tester.tap(find.text('Ali is 24 years old.'));
+    await tester.pumpAndSettle(); // Trigger a frame.
+
+    expect(find.text('Ali is 25 years old.'), findsOneWidget);
+  });
+}

example/integration_test/03.dart

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+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:app/01_simple_text_sample/main.dart' as example01;
+
+void test(){
+
+  testWidgets('simple text', (tester) async {
+    example01.main();
+    await tester.pumpAndSettle();
+
+    expect(find.text(''), findsNWidgets(2));
+    expect(find.text('0'), findsOneWidget);
+
+    await tester.tap(find.text('0'));
+    await tester.pumpAndSettle(); // Trigger a frame.
+
+    expect(find.text('a'), findsNWidgets(2));
+    expect(find.text('1'), findsOneWidget);
+
+    await tester.tap(find.text('1'));
+    await tester.pumpAndSettle(); // Trigger a frame.
+
+    expect(find.text('aa'), findsNWidgets(2));
+    expect(find.text('2'), findsOneWidget);
+  });
+}

example/integration_test/entry_point_test.dart

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+import 'package:integration_test/integration_test.dart';
+
+import './01.dart' as example01;
+import './02.dart' as example02;
+import './03.dart' as example03;
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+
+  example01.test();
+  example02.test();
+  example03.test();
+
+}