Enhance CMake configuration for UI tests and SDL2 linking

- Added support for UI tests in the CMake configuration by introducing the YAZE_ENABLE_UI_TESTS option, ensuring proper linking with the ImGuiTestEngine if available.
- Updated SDL2 linking in test CMakeLists to use variable targets for improved flexibility and compatibility across platforms.
- Modified sprite_position_test to check for ROM file existence using std::ifstream for better error handling.

test/CMakeLists.txt

@@ -72,7 +72,7 @@ target_include_directories(
 
 target_link_libraries(
   extract_vanilla_values
-  SDL2::SDL2
+  ${SDL_TARGETS}
   asar-static
   ${ABSL_TARGETS}
   ${PNG_LIBRARIES}
@@ -97,7 +97,7 @@ target_include_directories(
 
 target_link_libraries(
   yaze_test
-  SDL2::SDL2
+  ${SDL_TARGETS}
   asar-static
   ${ABSL_TARGETS}
   ${PNG_LIBRARIES}

test/zelda3/sprite_position_test.cc

@@ -2,6 +2,7 @@
 #include <memory>
 #include <iostream>
 #include <iomanip>
+#include <fstream>
 
 #include "app/rom.h"
 #include "app/zelda3/overworld/overworld.h"
@@ -18,7 +19,8 @@ protected:
     std::string rom_path = "bin/zelda3.sfc";
     
     // Check if ROM exists in build directory
-    if (std::filesystem::exists(rom_path)) {
+    std::ifstream rom_file(rom_path);
+    if (rom_file.good()) {
       ASSERT_TRUE(rom_->LoadFromFile(rom_path).ok()) << "Failed to load ROM from " << rom_path;
     } else {
       // Skip test if ROM not found