Refactor test structure and enhance object encoding tests

- Updated CMakeLists.txt to correct file paths for unit tests.
- Modified DungeonObjectRenderingE2ETests to inherit from BoundRomTest for better ROM management.
- Enhanced DungeonEditorIntegrationTest with improved mock ROM handling and added graphics data setup.
- Introduced a new MockRom class with methods for setting mock data and initializing memory layout.
- Added comprehensive unit tests for RoomObject encoding and decoding, covering all object types and edge cases.
- Refactored DungeonObjectRenderingTests to utilize BoundRomTest, ensuring consistent ROM loading and setup.
- Improved assertions in rendering tests for better clarity and reliability.

test/test_utils.h

@@ -12,6 +12,7 @@
 
 #include "absl/strings/str_format.h"
 #include "imgui_test_engine/imgui_te_context.h"
+#include "app/rom.h"
 
 namespace yaze {
 namespace test {
@@ -21,6 +22,8 @@ namespace test {
  */
 class TestRomManager {
  public:
+  class BoundRomTest;
+
   /**
    * @brief Check if ROM testing is enabled and ROM file exists
    * @return True if ROM tests can be run
@@ -129,6 +132,37 @@ class TestRomManager {
   }
 };
 
+class TestRomManager::BoundRomTest : public ::testing::Test {
+ protected:
+  void SetUp() override {
+    rom_instance_ = std::make_unique<Rom>();
+  }
+
+  void TearDown() override {
+    rom_instance_.reset();
+    rom_loaded_ = false;
+  }
+
+  Rom* rom() { EnsureRomLoaded(); return rom_instance_.get(); }
+  const Rom* rom() const { return rom_instance_.get(); }
+
+  std::string GetBoundRomPath() const { return TestRomManager::GetTestRomPath(); }
+
+ private:
+  std::unique_ptr<Rom> rom_instance_;
+  bool rom_loaded_ = false;
+
+  void EnsureRomLoaded() {
+    if (rom_loaded_) {
+      return;
+    }
+    const std::string rom_path = TestRomManager::GetTestRomPath();
+    ASSERT_TRUE(rom_instance_->LoadFromFile(rom_path).ok())
+        << "Failed to load test ROM from " << rom_path;
+    rom_loaded_ = true;
+  }
+};
+
 /**
  * @brief Test macro for ROM-dependent tests
  */