Fix the mapping from exit response strings to the FlPlatformChannelExitResponse enum (#56769)

Author: jason-simmons

ci/licenses_golden/licenses_flutter

@@ -45060,6 +45060,7 @@ ORIGIN: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture_private.h
 ORIGIN: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture_test.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/linux/fl_platform_channel.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/linux/fl_platform_channel.h + ../../../flutter/LICENSE
+ORIGIN: ../../../flutter/shell/platform/linux/fl_platform_channel_test.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/linux/fl_platform_handler.cc + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/linux/fl_platform_handler.h + ../../../flutter/LICENSE
 ORIGIN: ../../../flutter/shell/platform/linux/fl_platform_handler_test.cc + ../../../flutter/LICENSE
@@ -48008,6 +48009,7 @@ FILE: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture_private.h
 FILE: ../../../flutter/shell/platform/linux/fl_pixel_buffer_texture_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_platform_channel.cc
 FILE: ../../../flutter/shell/platform/linux/fl_platform_channel.h
+FILE: ../../../flutter/shell/platform/linux/fl_platform_channel_test.cc
 FILE: ../../../flutter/shell/platform/linux/fl_platform_handler.cc
 FILE: ../../../flutter/shell/platform/linux/fl_platform_handler.h
 FILE: ../../../flutter/shell/platform/linux/fl_platform_handler_test.cc

shell/platform/linux/BUILD.gn

@@ -230,6 +230,7 @@ executable("flutter_linux_unittests") {
     "fl_method_codec_test.cc",
     "fl_method_response_test.cc",
     "fl_pixel_buffer_texture_test.cc",
+    "fl_platform_channel_test.cc",
     "fl_platform_handler_test.cc",
     "fl_plugin_registrar_test.cc",
     "fl_pointer_manager_test.cc",

shell/platform/linux/fl_platform_channel.cc

@@ -110,7 +110,7 @@ FlPlatformChannelExitResponse get_exit_response(FlMethodResponse* response) {
   if (strcmp(response_string, kExitResponseCancel) == 0) {
     return FL_PLATFORM_CHANNEL_EXIT_RESPONSE_CANCEL;
   } else if (strcmp(response_string, kExitResponseExit) == 0) {
-    return FL_PLATFORM_CHANNEL_EXIT_RESPONSE_CANCEL;
+    return FL_PLATFORM_CHANNEL_EXIT_RESPONSE_EXIT;
   }
 
   // If something went wrong, then just exit.

shell/platform/linux/fl_platform_channel_test.cc

@@ -0,0 +1,43 @@
+// Copyright 2013 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.
+
+#include "flutter/shell/platform/linux/fl_platform_channel.h"
+#include "flutter/shell/platform/linux/fl_binary_messenger_private.h"
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_method_channel.h"
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_standard_method_codec.h"
+#include "flutter/shell/platform/linux/testing/fl_test.h"
+#include "gtest/gtest.h"
+
+static void exit_method_response_cb(GObject* object,
+                                    GAsyncResult* result,
+                                    gpointer user_data) {
+  g_autoptr(GError) error = nullptr;
+  FlPlatformChannelExitResponse response;
+  gboolean success = fl_platform_channel_system_request_app_exit_finish(
+      object, result, &response, &error);
+
+  EXPECT_TRUE(success);
+  EXPECT_EQ(response, FL_PLATFORM_CHANNEL_EXIT_RESPONSE_EXIT);
+
+  g_main_loop_quit(static_cast<GMainLoop*>(user_data));
+}
+
+TEST(FlPlatformChannelTest, ExitResponse) {
+  g_autoptr(GMainLoop) loop = g_main_loop_new(nullptr, 0);
+
+  g_autoptr(FlEngine) engine = make_mock_engine();
+  g_autoptr(FlBinaryMessenger) messenger = fl_binary_messenger_new(engine);
+  g_autoptr(FlStandardMethodCodec) codec = fl_standard_method_codec_new();
+  g_autoptr(FlMethodChannel) channel = fl_method_channel_new(
+      messenger, "test/standard-method", FL_METHOD_CODEC(codec));
+
+  g_autoptr(FlValue) args = fl_value_new_map();
+  fl_value_set_string_take(args, "response", fl_value_new_string("exit"));
+
+  fl_method_channel_invoke_method(channel, "Echo", args, nullptr,
+                                  exit_method_response_cb, loop);
+
+  // Blocks here until method_response_cb is called.
+  g_main_loop_run(loop);
+}