Test that internal classes work as expected

test/project/main.gd

@@ -287,6 +287,13 @@ func _ready():
 	assert_equal(library_path, ProjectSettings.globalize_path(library_path))
 	assert_equal(FileAccess.file_exists(library_path), true)
 
+	# Test that internal classes work as expected (at least for Godot 4.5+).
+	assert_equal(ClassDB.can_instantiate("ExampleInternal"), false)
+	assert_equal(ClassDB.instantiate("ExampleInternal"), null)
+	var internal_class = example.test_get_internal_class()
+	assert_equal(internal_class.get_the_answer(), 42)
+	assert_equal(internal_class.get_class(), "ExampleInternal")
+
 	# Test a class with a unicode name.
 	var przykład = ExamplePrzykład.new()
 	assert_equal(przykład.get_the_word(), "słowo to przykład")

test/src/example.cpp

@@ -252,6 +252,8 @@ void Example::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("test_use_engine_singleton"), &Example::test_use_engine_singleton);
 
+	ClassDB::bind_method(D_METHOD("test_get_internal_class"), &Example::test_get_internal_class);
+
 	ClassDB::bind_static_method("Example", D_METHOD("test_static", "a", "b"), &Example::test_static);
 	ClassDB::bind_static_method("Example", D_METHOD("test_static2"), &Example::test_static2);
 
@@ -744,6 +746,12 @@ String Example::test_library_path() {
 	return library_path;
 }
 
+Ref<RefCounted> Example::test_get_internal_class() const {
+	Ref<ExampleInternal> it;
+	it.instantiate();
+	return it;
+}
+
 int64_t Example::test_get_internal(const Variant &p_input) const {
 	if (p_input.get_type() != Variant::INT) {
 		return -1;
@@ -779,3 +787,11 @@ void ExamplePrzykład::_bind_methods() {
 String ExamplePrzykład::get_the_word() const {
 	return U"słowo to przykład";
 }
+
+void ExampleInternal::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("get_the_answer"), &ExampleInternal::get_the_answer);
+}
+
+int ExampleInternal::get_the_answer() const {
+	return 42;
+}

test/src/example.h

@@ -29,6 +29,8 @@
 
 using namespace godot;
 
+class ExampleInternal;
+
 class ExampleRef : public RefCounted {
 	GDCLASS(ExampleRef, RefCounted);
 
@@ -203,6 +205,8 @@ public:
 	String test_use_engine_singleton() const;
 
 	static String test_library_path();
+
+	Ref<RefCounted> test_get_internal_class() const;
 };
 
 VARIANT_ENUM_CAST(Example::Constants);
@@ -288,3 +292,13 @@ protected:
 public:
 	String get_the_word() const;
 };
+
+class ExampleInternal : public RefCounted {
+	GDCLASS(ExampleInternal, RefCounted);
+
+protected:
+	static void _bind_methods();
+
+public:
+	int get_the_answer() const;
+};

test/src/register_types.cpp

@@ -31,6 +31,7 @@ void initialize_example_module(ModuleInitializationLevel p_level) {
 	GDREGISTER_CLASS(ExampleChild);
 	GDREGISTER_RUNTIME_CLASS(ExampleRuntime);
 	GDREGISTER_CLASS(ExamplePrzykład);
+	GDREGISTER_INTERNAL_CLASS(ExampleInternal);
 }
 
 void uninitialize_example_module(ModuleInitializationLevel p_level) {