Added platform channel integration tests for macos (#110606)

.ci.yaml

@@ -3768,6 +3768,25 @@ targets:
       - bin/**
       - .ci.yaml
 
+  - name: Mac channels_integration_test
+    recipe: devicelab/devicelab_drone
+    timeout: 60
+    bringup: true
+    properties:
+      dependencies: >-
+        [
+          {"dependency": "xcode", "version": "13f17a"},
+          {"dependency": "gems", "version": "v3.3.14"}
+        ]
+      tags: >
+        ["devicelab", "hostonly"]
+      task_name: channels_integration_test_macos
+    runIf:
+      - dev/**
+      - packages/flutter_tools/**
+      - bin/**
+      - .ci.yaml
+
   - name: Mac run_release_test_macos
     recipe: devicelab/devicelab_drone
     timeout: 60

TESTOWNERS

@@ -206,49 +206,50 @@
 /dev/devicelab/bin/tasks/tiles_scroll_perf_ios__timeline_summary.dart @zanderso @flutter/engine
 
 ## Host only DeviceLab tests
+/dev/devicelab/bin/tasks/basic_material_app_macos__compile.dart @a-wallen @flutter/desktop
 /dev/devicelab/bin/tasks/build_aar_module_test.dart @zanderso @flutter/tool
+/dev/devicelab/bin/tasks/build_ios_framework_module_test.dart @jmagman @flutter/tool
+/dev/devicelab/bin/tasks/channels_integration_test_macos.dart @gaaclarke @flutter/desktop
+/dev/devicelab/bin/tasks/complex_layout_macos__compile.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/complex_layout_macos__start_up.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/complex_layout_win_desktop__compile.dart @yaakovschectman @flutter/desktop
+/dev/devicelab/bin/tasks/complex_layout_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
+/dev/devicelab/bin/tasks/dart_plugin_registry_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/entrypoint_dart_registrant.dart @aaclarke @flutter/plugin
+/dev/devicelab/bin/tasks/flutter_gallery_macos__compile.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/flutter_gallery_macos__start_up.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/flutter_gallery_win_desktop__compile.dart @yaakovschectman @flutter/desktop
+/dev/devicelab/bin/tasks/flutter_gallery_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
+/dev/devicelab/bin/tasks/flutter_view_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
 /dev/devicelab/bin/tasks/gradle_desugar_classes_test.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/gradle_non_android_plugin_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/gradle_non_android_plugin_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/gradle_plugin_bundle_test.dart @stuartmorgan @flutter/plugin
 /dev/devicelab/bin/tasks/gradle_plugin_bundle_test.dart @stuartmorgan @flutter/plugin
 /dev/devicelab/bin/tasks/gradle_plugin_fat_apk_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/gradle_plugin_fat_apk_test.dart @stuartmorgan @flutter/plugin
 /dev/devicelab/bin/tasks/gradle_plugin_light_apk_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/gradle_plugin_light_apk_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/hello_world_macos__compile.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/hello_world_win_desktop__compile.dart @yaakovschectman @flutter/desktop
 /dev/devicelab/bin/tasks/hot_mode_dev_cycle_win_target__benchmark.dart @cbracken @flutter/desktop
 /dev/devicelab/bin/tasks/module_custom_host_app_name_test.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/module_host_with_custom_build_test.dart @zanderso @flutter/tool
+/dev/devicelab/bin/tasks/module_test_ios.dart @jmagman @flutter/tool
 /dev/devicelab/bin/tasks/module_test.dart @zanderso @flutter/tool
 /dev/devicelab/bin/tasks/native_ui_tests_macos.dart @cbracken @flutter/desktop
 /dev/devicelab/bin/tasks/platform_channel_sample_test_windows.dart @cbracken @flutter/desktop
-/dev/devicelab/bin/tasks/plugin_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/platform_view_macos__start_up.dart @a-wallen @flutter/desktop
+/dev/devicelab/bin/tasks/platform_view_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
+/dev/devicelab/bin/tasks/plugin_lint_mac.dart @stuartmorgan @flutter/plugin
 /dev/devicelab/bin/tasks/plugin_test_ios.dart @jmagman @flutter/ios
+/dev/devicelab/bin/tasks/plugin_test.dart @stuartmorgan @flutter/plugin
+/dev/devicelab/bin/tasks/run_release_test_macos.dart @cbracken @flutter/tool
 /dev/devicelab/bin/tasks/technical_debt__cost.dart @HansMuller @flutter/framework
 /dev/devicelab/bin/tasks/web_benchmarks_canvaskit.dart @yjbanov @flutter/web
 /dev/devicelab/bin/tasks/web_benchmarks_html.dart @yjbanov @flutter/web
-/dev/devicelab/bin/tasks/build_ios_framework_module_test.dart @jmagman @flutter/tool
-/dev/devicelab/bin/tasks/dart_plugin_registry_test.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/gradle_non_android_plugin_test.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/gradle_plugin_bundle_test.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/gradle_plugin_fat_apk_test.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/gradle_plugin_light_apk_test.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/module_test_ios.dart @jmagman @flutter/tool
-/dev/devicelab/bin/tasks/plugin_lint_mac.dart @stuartmorgan @flutter/plugin
-/dev/devicelab/bin/tasks/run_release_test_macos.dart @cbracken @flutter/tool
-/dev/devicelab/bin/tasks/entrypoint_dart_registrant.dart @aaclarke @flutter/plugin
 /dev/devicelab/bin/tasks/windows_home_scroll_perf__timeline_summary.dart @jonahwilliams @flutter/engine
-/dev/devicelab/bin/tasks/hello_world_win_desktop__compile.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/flutter_gallery_win_desktop__compile.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/flutter_gallery_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/complex_layout_win_desktop__compile.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/complex_layout_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/flutter_view_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/platform_view_win_desktop__start_up.dart @yaakovschectman @flutter/desktop
-/dev/devicelab/bin/tasks/hello_world_macos__compile.dart @a-wallen @flutter/desktop
-/dev/devicelab/bin/tasks/basic_material_app_macos__compile.dart @a-wallen @flutter/desktop
-/dev/devicelab/bin/tasks/complex_layout_macos__start_up.dart @a-wallen @flutter/desktop
 /dev/devicelab/bin/tasks/windows_startup_test.dart @loic-sharma @flutter/desktop
-/dev/devicelab/bin/tasks/complex_layout_macos__compile.dart @a-wallen @flutter/desktop
-/dev/devicelab/bin/tasks/flutter_gallery_macos__compile.dart @a-wallen @flutter/desktop
-/dev/devicelab/bin/tasks/flutter_gallery_macos__start_up.dart @a-wallen @flutter/desktop
-/dev/devicelab/bin/tasks/platform_view_macos__start_up.dart @a-wallen @flutter/desktop
 
 ## Host only framework tests
 # Linux analyze

dev/devicelab/bin/tasks/channels_integration_test_macos.dart

+// 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/tasks/integration_tests.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.macos;
+  await task(createChannelsIntegrationTest());
+}

dev/integration_tests/channels/lib/main.dart

@@ -3,6 +3,7 @@
 // found in the LICENSE file.
 
 import 'dart:async';
+import 'dart:io' show Platform;
 import 'dart:typed_data';
 
 import 'package:flutter/material.dart';
@@ -110,11 +111,17 @@ class _TestAppState extends State<TestApp> {
     () => methodCallStandardErrorHandshake('world'),
     () => methodCallStandardNotImplementedHandshake(),
     () => basicBinaryHandshake(null),
-    () => basicBinaryHandshake(ByteData(0)),
+    if (!Platform.isMacOS)
+      // Note, it was decided that this will function differently on macOS. See
+      // also: https://github.com/flutter/flutter/issues/110865.
+      () => basicBinaryHandshake(ByteData(0)),
     () => basicBinaryHandshake(ByteData(4)..setUint32(0, 0x12345678)),
     () => basicStringHandshake('hello, world'),
     () => basicStringHandshake('hello \u263A \u{1f602} unicode'),
-    () => basicStringHandshake(''),
+    if (!Platform.isMacOS)
+      // Note, it was decided that this will function differently on macOS. See
+      // also: https://github.com/flutter/flutter/issues/110865.
+      () => basicStringHandshake(''),
     () => basicStringHandshake(null),
     () => basicJsonHandshake(null),
     () => basicJsonHandshake(true),

dev/integration_tests/channels/macos/.gitignore

+# Flutter-related
+**/Flutter/ephemeral/
+**/Pods/
+
+# Xcode-related
+**/dgph
+**/xcuserdata/

dev/integration_tests/channels/macos/Flutter/Flutter-Debug.xcconfig

+#include "ephemeral/Flutter-Generated.xcconfig"

dev/integration_tests/channels/macos/Flutter/Flutter-Release.xcconfig

+#include "ephemeral/Flutter-Generated.xcconfig"

dev/integration_tests/channels/macos/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

dev/integration_tests/channels/macos/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1300"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+               BuildableName = "channels.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "channels.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "channels.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "33CC10EC2044A3C60003C045"
+            BuildableName = "channels.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

dev/integration_tests/channels/macos/Runner.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

dev/integration_tests/channels/macos/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

dev/integration_tests/channels/macos/Runner/AppDelegate.swift

+// 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 Cocoa
+import FlutterMacOS
+
+@NSApplicationMain
+class AppDelegate: FlutterAppDelegate {
+  override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
+    return true
+  }
+}

dev/integration_tests/channels/macos/Runner/Assets.xcassets/Contents.json

+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

dev/integration_tests/channels/macos/Runner/Configs/AppInfo.xcconfig

+// Application-level settings for the Runner target.
+//
+// This may be replaced with something auto-generated from metadata (e.g., pubspec.yaml) in the
+// future. If not, the values below would default to using the project name when this becomes a
+// 'flutter create' template.
+
+// The application's name. By default this is also the title of the Flutter window.
+PRODUCT_NAME = channels
+
+// The application's bundle identifier
+PRODUCT_BUNDLE_IDENTIFIER = com.yourcompany.channels
+
+// The copyright displayed in application information
+PRODUCT_COPYRIGHT = Copyright © 2022 com.yourcompany. All rights reserved.

dev/integration_tests/channels/macos/Runner/Configs/Debug.xcconfig

+#include "../../Flutter/Flutter-Debug.xcconfig"
+#include "Warnings.xcconfig"

dev/integration_tests/channels/macos/Runner/Configs/Release.xcconfig

+#include "../../Flutter/Flutter-Release.xcconfig"
+#include "Warnings.xcconfig"

dev/integration_tests/channels/macos/Runner/Configs/Warnings.xcconfig

+WARNING_CFLAGS = -Wall -Wconditional-uninitialized -Wnullable-to-nonnull-conversion -Wmissing-method-return-type -Woverlength-strings
+GCC_WARN_UNDECLARED_SELECTOR = YES
+CLANG_UNDEFINED_BEHAVIOR_SANITIZER_NULLABILITY = YES
+CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE
+CLANG_WARN__DUPLICATE_METHOD_MATCH = YES
+CLANG_WARN_PRAGMA_PACK = YES
+CLANG_WARN_STRICT_PROTOTYPES = YES
+CLANG_WARN_COMMA = YES
+GCC_WARN_STRICT_SELECTOR_MATCH = YES
+CLANG_WARN_OBJC_REPEATED_USE_OF_WEAK = YES
+CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES
+GCC_WARN_SHADOW = YES
+CLANG_WARN_UNREACHABLE_CODE = YES

dev/integration_tests/channels/macos/Runner/DebugProfile.entitlements

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+	<key>com.apple.security.cs.allow-jit</key>
+	<true/>
+	<key>com.apple.security.network.server</key>
+	<true/>
+</dict>
+</plist>

dev/integration_tests/channels/macos/Runner/Info.plist

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIconFile</key>
+	<string></string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>$(MACOSX_DEPLOYMENT_TARGET)</string>
+	<key>NSHumanReadableCopyright</key>
+	<string>$(PRODUCT_COPYRIGHT)</string>
+	<key>NSMainNibFile</key>
+	<string>MainMenu</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+</dict>
+</plist>

dev/integration_tests/channels/macos/Runner/MainFlutterWindow.swift

+// 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 Cocoa
+import FlutterMacOS
+
+let DATE: UInt8 = 128
+let PAIR: UInt8 = 129
+
+class Pair {
+  let first: Any?
+  let second: Any?
+  init(first: Any?, second: Any?) {
+    self.first = first
+    self.second = second
+  }
+}
+
+class ExtendedWriter: FlutterStandardWriter {
+  override func writeValue(_ value: Any) {
+    if let date = value as? Date {
+      self.writeByte(DATE)
+      let time = date.timeIntervalSince1970
+      var ms = Int64(time * 1000.0)
+      self.writeBytes(&ms, length: UInt(MemoryLayout<Int64>.size))
+    } else if let pair = value as? Pair {
+      self.writeByte(PAIR)
+      self.writeValue(pair.first!)
+      self.writeValue(pair.second!)
+    } else {
+      super.writeValue(value)
+    }
+  }
+}
+
+class ExtendedReader: FlutterStandardReader {
+  override func readValue(ofType type: UInt8) -> Any? {
+    if type == DATE {
+      var ms: Int64 = 0
+      self.readBytes(&ms, length: UInt(MemoryLayout<Int64>.size))
+      let time: Double = Double(ms) / 1000.0
+      return NSDate(timeIntervalSince1970: time)
+    } else if type == PAIR {
+      return Pair(first: self.readValue(), second: self.readValue())
+    } else {
+      return super.readValue(ofType: type)
+    }
+  }
+}
+
+class ExtendedReaderWriter: FlutterStandardReaderWriter {
+  override func reader(with data: Data) -> FlutterStandardReader {
+    return ExtendedReader(data: data)
+  }
+  override func writer(with data: NSMutableData) -> FlutterStandardWriter {
+    return ExtendedWriter(data: data)
+  }
+}
+
+class MainFlutterWindow: NSWindow {
+  override func awakeFromNib() {
+    let flutterViewController = FlutterViewController.init()
+    let windowFrame = self.frame
+    self.contentViewController = flutterViewController
+    self.setFrame(windowFrame, display: true)
+
+    RegisterGeneratedPlugins(registry: flutterViewController)
+    let registrar = flutterViewController.registrar(forPlugin: "channel-integration-test")
+    setupMessagingHandshakeOnChannel(
+      FlutterBasicMessageChannel(
+        name: "binary-msg",
+        binaryMessenger: registrar.messenger,
+        codec: FlutterBinaryCodec.sharedInstance()))
+    setupMessagingHandshakeOnChannel(
+      FlutterBasicMessageChannel(
+        name: "string-msg",
+        binaryMessenger: registrar.messenger,
+        codec: FlutterStringCodec.sharedInstance()))
+    setupMessagingHandshakeOnChannel(
+      FlutterBasicMessageChannel(
+        name: "json-msg",
+        binaryMessenger: registrar.messenger,
+        codec: FlutterJSONMessageCodec.sharedInstance()))
+    setupMessagingHandshakeOnChannel(
+      FlutterBasicMessageChannel(
+        name: "std-msg",
+        binaryMessenger: registrar.messenger,
+        codec: FlutterStandardMessageCodec(readerWriter: ExtendedReaderWriter())))
+
+    setupMethodHandshakeOnChannel(
+      FlutterMethodChannel(
+        name: "json-method",
+        binaryMessenger: registrar.messenger,
+        codec: FlutterJSONMethodCodec.sharedInstance()))
+    setupMethodHandshakeOnChannel(
+      FlutterMethodChannel(
+        name: "std-method",
+        binaryMessenger: registrar.messenger,
+        codec: FlutterStandardMethodCodec(readerWriter: ExtendedReaderWriter())))
+
+    super.awakeFromNib()
+  }
+
+  func setupMessagingHandshakeOnChannel(_ channel: FlutterBasicMessageChannel) {
+    channel.setMessageHandler { message, reply in
+      channel.sendMessage(message) { messageReply in
+        channel.sendMessage(messageReply)
+        reply(message)
+      }
+    }
+  }
+
+  func setupMethodHandshakeOnChannel(_ channel: FlutterMethodChannel) {
+    channel.setMethodCallHandler { call, result in
+      if call.method == "success" {
+        channel.invokeMethod(call.method, arguments: call.arguments) { value in
+          channel.invokeMethod(call.method, arguments: value)
+          result(call.arguments)
+        }
+      } else if call.method == "error" {
+        channel.invokeMethod(call.method, arguments: call.arguments) { value in
+          let error = value as! FlutterError
+          channel.invokeMethod(call.method, arguments: error.details)
+          result(error)
+        }
+      } else {
+        channel.invokeMethod(call.method, arguments: call.arguments) { value in
+          channel.invokeMethod(call.method, arguments: nil)
+          result(FlutterMethodNotImplemented)
+        }
+      }
+    }
+  }
+}

dev/integration_tests/channels/macos/Runner/Release.entitlements

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>com.apple.security.app-sandbox</key>
+	<true/>
+</dict>
+</plist>