Demonstrate that artifact invalidation works (#44312)

dev/bots/test.dart

@@ -742,6 +742,8 @@ Future<void> _runHostOnlyDeviceLabTests() async {
   // seed is fixed so that issues are reproducible.
   final List<ShardRunner> tests = <ShardRunner>[
     // Keep this in alphabetical order.
+    // TODO(jonahwilliams): enable APK invalidation in Windows shard.
+    if (!Platform.isWindows) () => _runDevicelabTest('apk_invalidation_test', environment: gradleEnvironment),
     () => _runDevicelabTest('build_aar_module_test', environment: gradleEnvironment),
     if (Platform.isMacOS) () => _runDevicelabTest('flutter_create_offline_test_mac'),
     if (Platform.isLinux) () => _runDevicelabTest('flutter_create_offline_test_linux'),

dev/devicelab/bin/tasks/apk_invalidation_test.dart

+// Copyright (c) 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter_devicelab/framework/apk_utils.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/framework/utils.dart';
+import 'package:path/path.dart' as path;
+
+final String gradlew = Platform.isWindows ? 'gradlew.bat' : 'gradlew';
+final String gradlewExecutable = Platform.isWindows ? '.\\$gradlew' : './$gradlew';
+
+final bool useAndroidEmbeddingV2 = Platform.environment['ENABLE_ANDROID_EMBEDDING_V2'] == 'true';
+
+/// Tests that the Flutter module project template works and supports
+/// adding Flutter to an existing Android app.
+Future<void> main() async {
+  await task(() async {
+
+    section('Find Java');
+
+    final String javaHome = await findJavaHome();
+    if (javaHome == null)
+      return TaskResult.failure('Could not find Java');
+    print('\nUsing JAVA_HOME=$javaHome');
+
+    section('Create Flutter module project');
+
+    final Directory tempDir = Directory.systemTemp.createTempSync('flutter_module_test.');
+    final Directory projectDir = Directory(path.join(tempDir.path, 'hello'));
+    try {
+      await inDirectory(tempDir, () async {
+        await flutter(
+          'create',
+          options: <String>['--org', 'io.flutter.devicelab', 'hello'],
+        );
+      });
+
+      section('Add assets');
+
+      final File pubspec = File(path.join(projectDir.path, 'pubspec.yaml'));
+      String content = await pubspec.readAsString();
+      content = content.replaceFirst(
+        '\nflutter:\n',
+        '\nflutter:\n  assets:\n    - assets/\n',
+      );
+      await pubspec.writeAsString(content, flush: true);
+      File(path.join(projectDir.path, 'assets', 'a.txt'))
+        ..createSync(recursive: true);
+      File(path.join(projectDir.path, 'assets', 'b.txt'))
+        ..createSync();
+      await inDirectory(projectDir, () async {
+        await flutter(
+          'packages',
+          options: <String>['get'],
+        );
+      });
+
+      section('Build Flutter APK');
+
+      await inDirectory(projectDir, () async {
+        await flutter(
+          'build',
+          options: <String>['apk', '--debug'],
+        );
+      });
+
+     final String apkPath = path.join(
+        projectDir.path,
+        'build',
+        'app',
+        'outputs',
+        'apk',
+        'debug',
+        'app-debug.apk',
+      );
+
+      checkItContains<String>(<String>[
+        ...flutterAssets,
+        ...baseApkFiles,
+        'assets/flutter_assets/assets/a.txt',
+        'assets/flutter_assets/assets/b.txt',
+      ], await getFilesInApk(apkPath));
+
+      section('Invalidate asset bundle');
+
+      File(path.join(projectDir.path, 'assets', 'b.txt'))
+        ..deleteSync();
+
+      await inDirectory(projectDir, () async {
+        await flutter(
+          'build',
+          options: <String>['apk', '--debug'],
+        );
+      });
+
+      checkItDoesNotContain(<String>[
+        'assets/flutter_assets/assets/b.txt',
+      ], await getFilesInApk(apkPath));
+      return TaskResult.success(null);
+    } on TaskResult catch (taskResult) {
+      return taskResult;
+    } catch (e) {
+      return TaskResult.failure(e.toString());
+    } finally {
+      rmTree(tempDir);
+    }
+  });
+}