diff --git a/shell/platform/linux/fl_basic_message_channel_test.cc b/shell/platform/linux/fl_basic_message_channel_test.cc
index 0850196bb783a..d4c338836e6a6 100644
--- a/shell/platform/linux/fl_basic_message_channel_test.cc
+++ b/shell/platform/linux/fl_basic_message_channel_test.cc
@@ -9,20 +9,9 @@
 #include "flutter/shell/platform/linux/fl_engine_private.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_basic_message_channel.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_standard_message_codec.h"
+#include "flutter/shell/platform/linux/testing/fl_test.h"
 #include "flutter/shell/platform/linux/testing/mock_renderer.h"
 
-// Creates a mock engine that responds to platform messages.
-static FlEngine* make_mock_engine() {
-  g_autoptr(FlDartProject) project = fl_dart_project_new();
-  g_autoptr(FlMockRenderer) renderer = fl_mock_renderer_new();
-  g_autoptr(FlEngine) engine = fl_engine_new(project, FL_RENDERER(renderer));
-  g_autoptr(GError) engine_error = nullptr;
-  EXPECT_TRUE(fl_engine_start(engine, &engine_error));
-  EXPECT_EQ(engine_error, nullptr);
-
-  return static_cast<FlEngine*>(g_object_ref(engine));
-}
-
 // Called when the message response is received in the SendMessage test.
 static void echo_response_cb(GObject* object,
                              GAsyncResult* result,
diff --git a/shell/platform/linux/fl_binary_messenger_test.cc b/shell/platform/linux/fl_binary_messenger_test.cc
index 4916019214178..4d568545cb670 100644
--- a/shell/platform/linux/fl_binary_messenger_test.cc
+++ b/shell/platform/linux/fl_binary_messenger_test.cc
@@ -10,20 +10,9 @@
 #include "flutter/shell/platform/linux/fl_binary_messenger_private.h"
 #include "flutter/shell/platform/linux/fl_engine_private.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_binary_messenger.h"
+#include "flutter/shell/platform/linux/testing/fl_test.h"
 #include "flutter/shell/platform/linux/testing/mock_renderer.h"
 
-// Creates a mock engine that responds to platform messages.
-static FlEngine* make_mock_engine() {
-  g_autoptr(FlDartProject) project = fl_dart_project_new();
-  g_autoptr(FlMockRenderer) renderer = fl_mock_renderer_new();
-  g_autoptr(FlEngine) engine = fl_engine_new(project, FL_RENDERER(renderer));
-  g_autoptr(GError) engine_error = nullptr;
-  EXPECT_TRUE(fl_engine_start(engine, &engine_error));
-  EXPECT_EQ(engine_error, nullptr);
-
-  return static_cast<FlEngine*>(g_object_ref(engine));
-}
-
 // Checks sending nullptr for a message works.
 TEST(FlBinaryMessengerTest, SendNullptrMessage) {
   g_autoptr(FlEngine) engine = make_mock_engine();
diff --git a/shell/platform/linux/fl_key_event_plugin_test.cc b/shell/platform/linux/fl_key_event_plugin_test.cc
index 0193727b0112d..4f3f99a39de39 100644
--- a/shell/platform/linux/fl_key_event_plugin_test.cc
+++ b/shell/platform/linux/fl_key_event_plugin_test.cc
@@ -11,20 +11,9 @@
 #include "flutter/shell/platform/linux/fl_engine_private.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_basic_message_channel.h"
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_standard_message_codec.h"
+#include "flutter/shell/platform/linux/testing/fl_test.h"
 #include "flutter/shell/platform/linux/testing/mock_renderer.h"
 
-// Creates a mock engine that responds to platform messages.
-static FlEngine* make_mock_engine() {
-  g_autoptr(FlDartProject) project = fl_dart_project_new();
-  g_autoptr(FlMockRenderer) renderer = fl_mock_renderer_new();
-  g_autoptr(FlEngine) engine = fl_engine_new(project, FL_RENDERER(renderer));
-  g_autoptr(GError) engine_error = nullptr;
-  EXPECT_TRUE(fl_engine_start(engine, &engine_error));
-  EXPECT_EQ(engine_error, nullptr);
-
-  return static_cast<FlEngine*>(g_object_ref(engine));
-}
-
 const char* expected_value = nullptr;
 
 // Called when the message response is received in the send_key_event test.
diff --git a/shell/platform/linux/fl_method_channel_test.cc b/shell/platform/linux/fl_method_channel_test.cc
index 5026641aaae37..360ae327861d6 100644
--- a/shell/platform/linux/fl_method_channel_test.cc
+++ b/shell/platform/linux/fl_method_channel_test.cc
@@ -11,20 +11,9 @@
 #include "flutter/shell/platform/linux/public/flutter_linux/fl_basic_message_channel.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 "flutter/shell/platform/linux/testing/mock_renderer.h"
 
-// Creates a mock engine that responds to platform messages.
-static FlEngine* make_mock_engine() {
-  g_autoptr(FlDartProject) project = fl_dart_project_new();
-  g_autoptr(FlMockRenderer) renderer = fl_mock_renderer_new();
-  g_autoptr(FlEngine) engine = fl_engine_new(project, FL_RENDERER(renderer));
-  g_autoptr(GError) engine_error = nullptr;
-  EXPECT_TRUE(fl_engine_start(engine, &engine_error));
-  EXPECT_EQ(engine_error, nullptr);
-
-  return static_cast<FlEngine*>(g_object_ref(engine));
-}
-
 // Called when when the method call response is received in the InvokeMethod
 // test.
 static void method_response_cb(GObject* object,
diff --git a/shell/platform/linux/testing/fl_test.cc b/shell/platform/linux/testing/fl_test.cc
index bd0864c62d315..735d4a9e74e81 100644
--- a/shell/platform/linux/testing/fl_test.cc
+++ b/shell/platform/linux/testing/fl_test.cc
@@ -1,9 +1,15 @@
 // 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.
+// FLUTTER_NOLINT
+
+#include "gtest/gtest.h"
 
 #include "flutter/shell/platform/linux/testing/fl_test.h"
 
+#include "flutter/shell/platform/linux/fl_engine_private.h"
+#include "flutter/shell/platform/linux/testing/mock_renderer.h"
+
 static uint8_t hex_digit_to_int(char value) {
   if (value >= '0' && value <= '9')
     return value - '0';
@@ -39,3 +45,14 @@ gchar* bytes_to_hex_string(GBytes* bytes) {
     g_string_append_printf(hex_string, "%02x", data[i]);
   return g_string_free(hex_string, FALSE);
 }
+
+FlEngine* make_mock_engine() {
+  g_autoptr(FlDartProject) project = fl_dart_project_new();
+  g_autoptr(FlMockRenderer) renderer = fl_mock_renderer_new();
+  g_autoptr(FlEngine) engine = fl_engine_new(project, FL_RENDERER(renderer));
+  g_autoptr(GError) engine_error = nullptr;
+  EXPECT_TRUE(fl_engine_start(engine, &engine_error));
+  EXPECT_EQ(engine_error, nullptr);
+
+  return static_cast<FlEngine*>(g_object_ref(engine));
+}
diff --git a/shell/platform/linux/testing/fl_test.h b/shell/platform/linux/testing/fl_test.h
index 9f28da3f3b048..fe897fc71a769 100644
--- a/shell/platform/linux/testing/fl_test.h
+++ b/shell/platform/linux/testing/fl_test.h
@@ -5,6 +5,8 @@
 #ifndef FLUTTER_SHELL_PLATFORM_LINUX_FL_TEST_H_
 #define FLUTTER_SHELL_PLATFORM_LINUX_FL_TEST_H_
 
+#include "flutter/shell/platform/linux/public/flutter_linux/fl_engine.h"
+
 #include <glib.h>
 #include <stdint.h>
 
@@ -18,6 +20,9 @@ GBytes* hex_string_to_bytes(const gchar* hex_string);
 // Helper function to convert GBytes into a hexadecimal string (e.g. "01feab")
 gchar* bytes_to_hex_string(GBytes* bytes);
 
+// Creates a mock engine that responds to platform messages.
+FlEngine* make_mock_engine();
+
 G_END_DECLS
 
 #endif  // FLUTTER_SHELL_PLATFORM_LINUX_FL_TEST_H_