feat: Add unit test for loading ROM file in OverworldTest

src/test/CMakeLists.txt

@@ -8,6 +8,7 @@ add_executable(
   test/gfx/compression_test.cc
   test/gfx/snes_palette_test.cc
   test/integration/test_editor.cc
+  test/zelda3/overworld_test.cc
   test/zelda3/sprite_builder_test.cc
   cli/command_handler.cc
   app/rom.cc

src/test/zelda3/overworld_test.cc

@@ -0,0 +1,35 @@
+#include "app/zelda3/overworld/overworld.h"
+
+#include <gmock/gmock.h>
+#include <gtest/gtest.h>
+
+#include "app/rom.h"
+#include "app/zelda3/overworld/overworld_map.h"
+
+namespace yaze {
+namespace test {
+namespace zelda3 {
+
+class OverworldTest : public ::testing::Test {
+ protected:
+  void SetUp() override {}
+  void TearDown() override {}
+
+  app::zelda3::overworld::Overworld overworld_;
+};
+
+TEST_F(OverworldTest, OverworldLoadNoRomDataError) {
+  // Arrange
+  app::Rom rom;
+
+  // Act
+  auto status = overworld_.Load(rom);
+
+  // Assert
+  EXPECT_FALSE(status.ok());
+  EXPECT_THAT(status.message(), testing::HasSubstr("ROM file not loaded"));
+}
+
+}  // namespace zelda3
+}  // namespace test
+}  // namespace yaze