Terminate simulator app on "q" (#113581)

.ci.yaml

@@ -3690,6 +3690,15 @@ targets:
         ["devicelab", "ios", "mac"]
       task_name: hot_mode_dev_cycle_ios__benchmark
 
+  - name: Mac_ios hot_mode_dev_cycle_ios_simulator
+    recipe: devicelab/devicelab_drone
+    bringup: true
+    timeout: 60
+    properties:
+      tags: >
+        ["devicelab", "ios", "mac"]
+      task_name: hot_mode_dev_cycle_ios_simulator
+
   - name: Mac_ios fullscreen_textfield_perf_ios__e2e_summary
     recipe: devicelab/devicelab_drone
     presubmit: false

TESTOWNERS

@@ -168,6 +168,7 @@
 /dev/devicelab/bin/tasks/fullscreen_textfield_perf_impeller_ios__e2e_summary.dart @zanderso @flutter/engine
 /dev/devicelab/bin/tasks/fullscreen_textfield_perf_ios__e2e_summary.dart @zanderso @flutter/engine
 /dev/devicelab/bin/tasks/hello_world_ios__compile.dart @zanderso @flutter/engine
+/dev/devicelab/bin/tasks/hot_mode_dev_cycle_ios_simulator.dart @jmagman @flutter/tool
 /dev/devicelab/bin/tasks/hot_mode_dev_cycle_ios__benchmark.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/hot_mode_dev_cycle_macos_target__benchmark.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/imagefiltered_transform_animation_perf_impeller_ios__timeline_summary.dart @zanderso @flutter/engine

dev/devicelab/bin/tasks/hot_mode_dev_cycle_ios_simulator.dart

@@ -0,0 +1,27 @@
+// Copyright 2014 The Flutter 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 'package:flutter_devicelab/framework/devices.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+import 'package:flutter_devicelab/framework/ios.dart';
+import 'package:flutter_devicelab/framework/task_result.dart';
+import 'package:flutter_devicelab/tasks/hot_mode_tests.dart';
+
+Future<void> main() async {
+  await task(() async {
+    deviceOperatingSystem = DeviceOperatingSystem.ios;
+    String? simulatorDeviceId;
+    try {
+      await testWithNewIOSSimulator('TestHotReloadSim', (String deviceId) async {
+        simulatorDeviceId = deviceId;
+        // This isn't actually a benchmark test, so do not use the returned `benchmarkScoreKeys` result.
+        await createHotModeTest(deviceIdOverride: deviceId, checkAppRunningOnLocalDevice: true)();
+      });
+    } finally {
+      await removeIOSimulator(simulatorDeviceId);
+    }
+
+    return TaskResult.success(null);
+  });
+}

dev/devicelab/bin/tasks/hot_mode_dev_cycle_linux_target__benchmark.dart

@@ -6,5 +6,5 @@ import 'package:flutter_devicelab/framework/framework.dart';
 import 'package:flutter_devicelab/tasks/hot_mode_tests.dart';
 
 Future<void> main() async {
-  await task(createHotModeTest(deviceIdOverride: 'linux'));
+  await task(createHotModeTest(deviceIdOverride: 'linux', checkAppRunningOnLocalDevice: true));
 }

dev/devicelab/lib/tasks/hot_mode_tests.dart

@@ -7,9 +7,11 @@ import 'dart:convert';
 import 'dart:io';
 
 import 'package:path/path.dart' as path;
+import 'package:process/process.dart';
 
 import '../framework/devices.dart';
 import '../framework/framework.dart';
+import '../framework/running_processes.dart';
 import '../framework/task_result.dart';
 import '../framework/utils.dart';
 
@@ -18,7 +20,11 @@ final Directory flutterGalleryDir = dir(path.join(flutterDirectory.path, 'dev/in
 const String kSourceLine = 'fontSize: (orientation == Orientation.portrait) ? 32.0 : 24.0';
 const String kReplacementLine = 'fontSize: (orientation == Orientation.portrait) ? 34.0 : 24.0';
 
-TaskFunction createHotModeTest({String? deviceIdOverride, Map<String, String>? environment}) {
+TaskFunction createHotModeTest({
+  String? deviceIdOverride,
+  Map<String, String>? environment,
+  bool checkAppRunningOnLocalDevice = false,
+}) {
   // This file is modified during the test and needs to be restored at the end.
   final File flutterFrameworkSource = file(path.join(
     flutterDirectory.path, 'packages/flutter/lib/src/widgets/framework.dart',
@@ -96,7 +102,7 @@ TaskFunction createHotModeTest({String? deviceIdOverride, Map<String, String>? e
             }
           });
 
-          largeReloadData = await captureReloadData(options, environment, benchmarkFile, (String line, Process process) {
+          largeReloadData = await captureReloadData(options, environment, benchmarkFile, (String line, Process process) async {
             if (!line.contains('Reloaded ')) {
               return;
             }
@@ -108,6 +114,9 @@ TaskFunction createHotModeTest({String? deviceIdOverride, Map<String, String>? e
               process.stdin.writeln('r');
               hotReloadCount += 1;
             } else {
+              if (checkAppRunningOnLocalDevice) {
+                await _checkAppRunning(true);
+              }
               process.stdin.writeln('q');
             }
           });
@@ -150,6 +159,9 @@ TaskFunction createHotModeTest({String? deviceIdOverride, Map<String, String>? e
                 json.decode(benchmarkFile.readAsStringSync()) as Map<String, dynamic>;
           }
         });
+        if (checkAppRunningOnLocalDevice) {
+          await _checkAppRunning(false);
+        }
       } finally {
         flutterFrameworkSource.writeAsStringSync(oldContents);
       }
@@ -257,3 +269,23 @@ Future<Map<String, dynamic>> captureReloadData(
   benchmarkFile.deleteSync();
   return result;
 }
+
+Future<void> _checkAppRunning(bool shouldBeRunning) async {
+  late Set<RunningProcessInfo> galleryProcesses;
+  for (int i = 0; i < 10; i++) {
+    final String exe = Platform.isWindows ? '.exe' : '';
+    galleryProcesses = await getRunningProcesses(
+      processName: 'Flutter Gallery$exe',
+      processManager: const LocalProcessManager(),
+    );
+
+    if (galleryProcesses.isNotEmpty == shouldBeRunning) {
+      return;
+    }
+
+    // Give the app time to shut down.
+    sleep(const Duration(seconds: 1));
+  }
+  print(galleryProcesses.join('\n'));
+  throw TaskResult.failure('Flutter Gallery app is ${shouldBeRunning ? 'not' : 'still'} running');
+}

packages/flutter_tools/lib/src/ios/simulators.dart

@@ -257,6 +257,25 @@ class SimControl {
     return result;
   }
 
+  Future<RunResult> stopApp(String deviceId, String appIdentifier) async {
+    RunResult result;
+    try {
+      result = await _processUtils.run(
+        <String>[
+          ..._xcode.xcrunCommand(),
+          'simctl',
+          'terminate',
+          deviceId,
+          appIdentifier,
+        ],
+        throwOnError: true,
+      );
+    } on ProcessException catch (exception) {
+      throwToolExit('Unable to terminate $appIdentifier on $deviceId:\n$exception');
+    }
+    return result;
+  }
+
   Future<void> takeScreenshot(String deviceId, String outputPath) async {
     try {
       await _processUtils.run(
@@ -536,8 +555,7 @@ class IOSSimulator extends Device {
     ApplicationPackage app, {
     String? userIdentifier,
   }) async {
-    // Currently we don't have a way to stop an app running on iOS.
-    return false;
+    return (await _simControl.stopApp(id, app.id)).exitCode == 0;
   }
 
   String get logFilePath {

packages/flutter_tools/test/general.shard/ios/simulators_test.dart

@@ -901,6 +901,24 @@ Dec 20 17:04:32 md32-11-vm1 Another App[88374]: Ignore this text'''
         throwsToolExit(message: r'Unable to launch'),
       );
     });
+
+    testWithoutContext('.stopApp() handles exceptions', () async {
+      fakeProcessManager.addCommand(const FakeCommand(
+        command: <String>[
+          'xcrun',
+          'simctl',
+          'terminate',
+          deviceId,
+          appId,
+        ],
+        exception: ProcessException('xcrun', <String>[]),
+      ));
+
+      expect(
+        () async => simControl.stopApp(deviceId, appId),
+        throwsToolExit(message: r'Unable to terminate'),
+      );
+    });
   });
 
   group('startApp', () {