Flutter create widget test template. (#11304)

* Flutter create widget test template.

Running `flutter create —with-widget-test` produces a test/widget_test.dart sample widget test.

* Generate widget test bits in flutter create.

* Path fix.

* Added types.

* Skip shell testing on windows.

* formatting fixes

* Update test sample to test the sample app.

* Formatting tweak.

packages/flutter_tools/templates/create/pubspec.yaml.tmpl

@@ -4,11 +4,15 @@ description: {{description}}
 dependencies:
   flutter:
     sdk: flutter
-{{#withDriverTest}}
+
 dev_dependencies:
+  flutter_test:
+    sdk: flutter
+{{#withDriverTest}}
   flutter_driver:
     sdk: flutter
 {{/withDriverTest}}
+
 {{#withPluginHook}}
   {{pluginProjectName}}:
     path: ../

packages/flutter_tools/templates/create/test/widget_test.dart.tmpl

+// 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:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import '../lib/main.dart';
+
+void main() {
+  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(new MyApp());
+
+    // Verify that our counter starts at 0.
+    expect(find.text('0'), findsOneWidget);
+    expect(find.text('1'), findsNothing);
+
+    // Tap the '+' icon and trigger a frame.
+    await tester.tap(find.byIcon(Icons.add));
+    await tester.pump();
+
+    // Verify that our counter has incremented.
+    expect(find.text('0'), findsNothing);
+    expect(find.text('1'), findsOneWidget);
+  });
+}

packages/flutter_tools/test/commands/create_test.dart

@@ -4,6 +4,7 @@
 
 import 'dart:async';
 import 'dart:convert';
+import 'dart:io' as io;
 
 import 'package:args/command_runner.dart';
 import 'package:flutter_tools/src/base/file_system.dart';
@@ -45,6 +46,7 @@ void main() {
           'ios/Runner/AppDelegate.m',
           'ios/Runner/main.m',
           'lib/main.dart',
+          'test/widget_test.dart'
         ],
       );
     });
@@ -59,7 +61,7 @@ void main() {
           'ios/Runner/Runner-Bridging-Header.h',
           'lib/main.dart',
         ],
-        <String>[
+        unexpectedPaths: <String>[
           'android/app/src/main/java/com/yourcompany/flutterproject/MainActivity.java',
           'ios/Runner/AppDelegate.h',
           'ios/Runner/AppDelegate.m',
@@ -83,6 +85,7 @@ void main() {
           'example/ios/Runner/main.m',
           'example/lib/main.dart',
         ],
+        plugin: true,
       );
     });
 
@@ -101,13 +104,14 @@ void main() {
           'example/ios/Runner/Runner-Bridging-Header.h',
           'example/lib/main.dart',
         ],
-        <String>[
+        unexpectedPaths: <String>[
           'android/src/main/java/com/yourcompany/flutterproject/FlutterProjectPlugin.java',
           'example/android/app/src/main/java/com/yourcompany/flutterprojectexample/MainActivity.java',
           'example/ios/Runner/AppDelegate.h',
           'example/ios/Runner/AppDelegate.m',
           'example/ios/Runner/main.m',
         ],
+        plugin: true,
       );
     });
 
@@ -119,10 +123,11 @@ void main() {
             'android/src/main/java/com/bar/foo/flutterproject/FlutterProjectPlugin.java',
             'example/android/app/src/main/java/com/bar/foo/flutterprojectexample/MainActivity.java',
           ],
-          <String>[
+          unexpectedPaths: <String>[
             'android/src/main/java/com/yourcompany/flutterproject/FlutterProjectPlugin.java',
             'example/android/app/src/main/java/com/yourcompany/flutterprojectexample/MainActivity.java',
           ],
+          plugin: true,
       );
     });
 
@@ -163,6 +168,24 @@ void main() {
         }
       }
 
+      // TODO(pq): enable when sky_shell is available
+      if (!io.Platform.isWindows) {
+        // Verify that the sample widget test runs cleanly.
+        final List<String> args = <String>[
+          fs.path.absolute(fs.path.join('bin', 'flutter_tools.dart')),
+          'test',
+          '--no-color',
+          fs.path.join(projectDir.path, 'test', 'widget_test.dart'),
+        ];
+
+        final ProcessResult result = await Process.run(
+          fs.path.join(dartSdkPath, 'bin', 'dart'),
+          args,
+          workingDirectory: projectDir.path,
+        );
+        expect(result.exitCode, 0);
+      }
+
       // Generated Xcode settings
       final String xcodeConfigPath = fs.path.join('ios', 'Flutter', 'Generated.xcconfig');
       expectExists(xcodeConfigPath);
@@ -232,7 +255,7 @@ void main() {
 
 Future<Null> _createAndAnalyzeProject(
     Directory dir, List<String> createArgs, List<String> expectedPaths,
-    [List<String> unexpectedPaths = const <String>[]]) async {
+    { List<String> unexpectedPaths = const <String>[], bool plugin = false }) async {
   Cache.flutterRoot = '../..';
   final CreateCommand command = new CreateCommand();
   final CommandRunner<Null> runner = createTestCommandRunner(command);
@@ -247,14 +270,29 @@ Future<Null> _createAndAnalyzeProject(
   for (String path in unexpectedPaths) {
     expect(fs.file(fs.path.join(dir.path, path)).existsSync(), false, reason: '$path exists');
   }
+
+  if (plugin) {
+    _analyze(dir.path, target: fs.path.join(dir.path, 'lib', 'flutter_project.dart'));
+    _analyze(fs.path.join(dir.path, 'example'));
+  } else {
+    _analyze(dir.path);
+  }
+}
+
+void _analyze(String workingDir, {String target}) {
   final String flutterToolsPath = fs.path.absolute(fs.path.join(
     'bin',
     'flutter_tools.dart',
   ));
+
+  final List<String> args = <String>[flutterToolsPath, 'analyze'];
+  if (target != null)
+    args.add(target);
+
   final ProcessResult exec = Process.runSync(
     '$dartSdkPath/bin/dart',
-    <String>[flutterToolsPath, 'analyze'],
-    workingDirectory: dir.path,
+    args,
+    workingDirectory: workingDir,
   );
   if (exec.exitCode != 0) {
     print(exec.stdout);