add plugin camera desktop

plugins/camera_desktop/linux/test/CMakeLists.txt

@@ -0,0 +1,33 @@
+find_package(GTest QUIET)
+if(NOT GTest_FOUND)
+  include(FetchContent)
+  FetchContent_Declare(
+    googletest
+    URL https://github.com/google/googletest/archive/refs/tags/v1.14.0.tar.gz
+    DOWNLOAD_EXTRACT_TIMESTAMP TRUE
+  )
+  set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+  FetchContent_MakeAvailable(googletest)
+endif()
+
+set(TEST_BINARY "camera_desktop_plugin_test")
+
+add_executable(${TEST_BINARY}
+  camera_desktop_plugin_test.cc
+)
+
+target_compile_features(${TEST_BINARY} PRIVATE cxx_std_14)
+
+target_include_directories(${TEST_BINARY} PRIVATE
+  "${CMAKE_CURRENT_SOURCE_DIR}/.."
+)
+
+target_link_libraries(${TEST_BINARY} PRIVATE
+  camera_desktop_plugin
+  flutter
+  GTest::gtest_main
+  GTest::gmock
+)
+
+include(GoogleTest)
+gtest_discover_tests(${TEST_BINARY})

plugins/camera_desktop/linux/test/camera_desktop_plugin_test.cc

@@ -0,0 +1,20 @@
+#include <flutter_linux/flutter_linux.h>
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "include/camera_desktop/camera_desktop_plugin.h"
+
+namespace camera_desktop {
+namespace test {
+
+TEST(CameraDesktopPlugin, PluginRegistration) {
+  // Verify the plugin registration function exists and is callable.
+  // Full lifecycle testing requires a running Flutter engine, so this
+  // just validates the symbol is exported.
+  EXPECT_NE(
+      reinterpret_cast<void*>(&camera_desktop_plugin_register_with_registrar),
+      nullptr);
+}
+
+}  // namespace test
+}  // namespace camera_desktop