godot/tests/scene/test_instance_placeholder.h

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/*  test_instance_placeholder.h                                           */
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#ifndef TEST_INSTANCE_PLACEHOLDER_H
#define TEST_INSTANCE_PLACEHOLDER_H

#include "scene/main/instance_placeholder.h"
#include "scene/resources/packed_scene.h"

#include "tests/test_macros.h"

class _TestInstancePlaceholderNode : public Node {
	GDCLASS(_TestInstancePlaceholderNode, Node);

protected:
	static void _bind_methods() {
		ClassDB::bind_method(D_METHOD("set_int_property", "int_property"), &_TestInstancePlaceholderNode::set_int_property);
		ClassDB::bind_method(D_METHOD("get_int_property"), &_TestInstancePlaceholderNode::get_int_property);

		ADD_PROPERTY(PropertyInfo(Variant::INT, "int_property"), "set_int_property", "get_int_property");

		ClassDB::bind_method(D_METHOD("set_reference_property", "reference_property"), &_TestInstancePlaceholderNode::set_reference_property);
		ClassDB::bind_method(D_METHOD("get_reference_property"), &_TestInstancePlaceholderNode::get_reference_property);

		ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "reference_property", PROPERTY_HINT_NODE_TYPE), "set_reference_property", "get_reference_property");

		ClassDB::bind_method(D_METHOD("set_reference_array_property", "reference_array_property"), &_TestInstancePlaceholderNode::set_reference_array_property);
		ClassDB::bind_method(D_METHOD("get_reference_array_property"), &_TestInstancePlaceholderNode::get_reference_array_property);

		// The hint string value "24/34:Node" is determined from existing PackedScenes with typed Array properties.
		ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "reference_array_property", PROPERTY_HINT_TYPE_STRING, "24/34:Node"), "set_reference_array_property", "get_reference_array_property");
	}

public:
	int int_property = 0;

	void set_int_property(int p_int) {
		int_property = p_int;
	}

	int get_int_property() const {
		return int_property;
	}

	Variant reference_property;

	void set_reference_property(const Variant &p_node) {
		reference_property = p_node;
	}

	Variant get_reference_property() const {
		return reference_property;
	}

	Array reference_array_property;

	void set_reference_array_property(const Array &p_array) {
		reference_array_property = p_array;
	}

	Array get_reference_array_property() const {
		return reference_array_property;
	}

	_TestInstancePlaceholderNode() {
		reference_array_property.set_typed(Variant::OBJECT, "Node", Variant());
	}
};

namespace TestInstancePlaceholder {

TEST_CASE("[SceneTree][InstancePlaceholder] Instantiate from placeholder with no overrides") {
	GDREGISTER_CLASS(_TestInstancePlaceholderNode);

	SUBCASE("with non-node values") {
		InstancePlaceholder *ip = memnew(InstancePlaceholder);
		ip->set_name("TestScene");
		Node *root = memnew(Node);
		SceneTree::get_singleton()->get_root()->add_child(root);

		root->add_child(ip);
		// Create a scene to instance.
		_TestInstancePlaceholderNode *scene = memnew(_TestInstancePlaceholderNode);
		scene->set_int_property(12);

		// Pack the scene.
		PackedScene *packed_scene = memnew(PackedScene);
		const Error err = packed_scene->pack(scene);
		REQUIRE(err == OK);

		// Instantiate the scene.
		_TestInstancePlaceholderNode *created = Object::cast_to<_TestInstancePlaceholderNode>(ip->create_instance(true, packed_scene));
		REQUIRE(created != nullptr);
		CHECK(created->get_name() == "TestScene");
		CHECK(created->get_int_property() == 12);

		root->queue_free();
		memdelete(scene);
	}

	SUBCASE("with node value") {
		InstancePlaceholder *ip = memnew(InstancePlaceholder);
		ip->set_name("TestScene");
		Node *root = memnew(Node);
		SceneTree::get_singleton()->get_root()->add_child(root);

		root->add_child(ip);
		// Create a scene to instance.
		_TestInstancePlaceholderNode *scene = memnew(_TestInstancePlaceholderNode);
		Node *referenced = memnew(Node);
		scene->add_child(referenced);
		referenced->set_owner(scene);
		scene->set_reference_property(referenced);
		// Pack the scene.
		PackedScene *packed_scene = memnew(PackedScene);
		const Error err = packed_scene->pack(scene);
		REQUIRE(err == OK);

		// Instantiate the scene.
		_TestInstancePlaceholderNode *created = Object::cast_to<_TestInstancePlaceholderNode>(ip->create_instance(true, packed_scene));
		REQUIRE(created != nullptr);
		CHECK(created->get_name() == "TestScene");
		CHECK(created->get_child_count() == 1);
		CHECK(created->get_reference_property().identity_compare(created->get_child(0, false)));
		CHECK_FALSE(created->get_reference_property().identity_compare(referenced));

		root->queue_free();
		memdelete(scene);
	}

	SUBCASE("with node-array value") {
		InstancePlaceholder *ip = memnew(InstancePlaceholder);
		ip->set_name("TestScene");
		Node *root = memnew(Node);
		SceneTree::get_singleton()->get_root()->add_child(root);

		root->add_child(ip);
		// Create a scene to instance.
		_TestInstancePlaceholderNode *scene = memnew(_TestInstancePlaceholderNode);
		Node *referenced1 = memnew(Node);
		Node *referenced2 = memnew(Node);
		scene->add_child(referenced1);
		scene->add_child(referenced2);
		referenced1->set_owner(scene);
		referenced2->set_owner(scene);
		Array node_array;
		node_array.set_typed(Variant::OBJECT, "Node", Variant());
		node_array.push_back(referenced1);
		node_array.push_back(referenced2);
		scene->set_reference_array_property(node_array);
		// Pack the scene.
		PackedScene *packed_scene = memnew(PackedScene);
		const Error err = packed_scene->pack(scene);
		REQUIRE(err == OK);

		// Instantiate the scene.
		_TestInstancePlaceholderNode *created = Object::cast_to<_TestInstancePlaceholderNode>(ip->create_instance(true, packed_scene));
		REQUIRE(created != nullptr);
		CHECK(created->get_name() == "TestScene");
		CHECK(created->get_child_count() == 2);
		Array created_array = created->get_reference_array_property();
		REQUIRE(created_array.size() == node_array.size());
		REQUIRE(created_array.size() == created->get_child_count());

		// Iterate over all nodes, since the ordering is not guaranteed.
		for (int i = 0; i < node_array.size(); i++) {
			bool node_found = false;
			for (int j = 0; j < created->get_child_count(); j++) {
				if (created_array[i].identity_compare(created->get_child(j, true))) {
					node_found = true;
				}
			}
			CHECK(node_found);
		}
		root->queue_free();
		memdelete(scene);
	}
}

TEST_CASE("[SceneTree][InstancePlaceholder] Instantiate from placeholder with overrides") {
	GDREGISTER_CLASS(_TestInstancePlaceholderNode);

	SUBCASE("with non-node values") {
		InstancePlaceholder *ip = memnew(InstancePlaceholder);
		Node *root = memnew(Node);
		SceneTree::get_singleton()->get_root()->add_child(root);

		root->add_child(ip);
		ip->set_name("TestScene");
		ip->set("int_property", 45);
		// Create a scene to pack.
		_TestInstancePlaceholderNode *scene = memnew(_TestInstancePlaceholderNode);
		scene->set_int_property(12);

		// Pack the scene.
		PackedScene *packed_scene = memnew(PackedScene);
		packed_scene->pack(scene);

		// Instantiate the scene.
		_TestInstancePlaceholderNode *created = Object::cast_to<_TestInstancePlaceholderNode>(ip->create_instance(true, packed_scene));
		REQUIRE(created != nullptr);
		CHECK(created->get_int_property() == 45);

		root->queue_free();
		memdelete(scene);
	}

	SUBCASE("with node values") {
		InstancePlaceholder *ip = memnew(InstancePlaceholder);
		ip->set_name("TestScene");
		Node *root = memnew(Node);
		Node *overriding = memnew(Node);
		SceneTree::get_singleton()->get_root()->add_child(root);

		root->add_child(ip);
		root->add_child(overriding);
		ip->set("reference_property", overriding);
		// Create a scene to instance.
		_TestInstancePlaceholderNode *scene = memnew(_TestInstancePlaceholderNode);
		Node *referenced = memnew(Node);
		scene->add_child(referenced);
		referenced->set_owner(scene);
		scene->set_reference_property(referenced);
		// Pack the scene.
		PackedScene *packed_scene = memnew(PackedScene);
		const Error err = packed_scene->pack(scene);
		REQUIRE(err == OK);

		// Instantiate the scene.
		_TestInstancePlaceholderNode *created = Object::cast_to<_TestInstancePlaceholderNode>(ip->create_instance(true, packed_scene));
		REQUIRE(created != nullptr);
		CHECK(created->get_name() == "TestScene");
		CHECK(created->get_child_count() == 1);
		CHECK(created->get_reference_property().identity_compare(overriding));
		CHECK_FALSE(created->get_reference_property().identity_compare(referenced));

		root->queue_free();
		memdelete(scene);
	}

	SUBCASE("with node-array value") {
		InstancePlaceholder *ip = memnew(InstancePlaceholder);
		ip->set_name("TestScene");
		Node *root = memnew(Node);
		SceneTree::get_singleton()->get_root()->add_child(root);

		Node *override1 = memnew(Node);
		Node *override2 = memnew(Node);
		Node *override3 = memnew(Node);
		root->add_child(ip);
		root->add_child(override1);
		root->add_child(override2);
		root->add_child(override3);

		Array override_node_array;
		override_node_array.set_typed(Variant::OBJECT, "Node", Variant());
		override_node_array.push_back(override1);
		override_node_array.push_back(override2);
		override_node_array.push_back(override3);

		ip->set("reference_array_property", override_node_array);

		// Create a scene to instance.
		_TestInstancePlaceholderNode *scene = memnew(_TestInstancePlaceholderNode);
		Node *referenced1 = memnew(Node);
		Node *referenced2 = memnew(Node);

		scene->add_child(referenced1);
		scene->add_child(referenced2);

		referenced1->set_owner(scene);
		referenced2->set_owner(scene);
		Array referenced_array;
		referenced_array.set_typed(Variant::OBJECT, "Node", Variant());
		referenced_array.push_back(referenced1);
		referenced_array.push_back(referenced2);

		scene->set_reference_array_property(referenced_array);
		// Pack the scene.
		PackedScene *packed_scene = memnew(PackedScene);
		const Error err = packed_scene->pack(scene);
		REQUIRE(err == OK);

		// Instantiate the scene.
		_TestInstancePlaceholderNode *created = Object::cast_to<_TestInstancePlaceholderNode>(ip->create_instance(true, packed_scene));
		REQUIRE(created != nullptr);
		CHECK(created->get_name() == "TestScene");
		CHECK(created->get_child_count() == 2);
		Array created_array = created->get_reference_array_property();
		REQUIRE_FALSE(created_array.size() == referenced_array.size());
		REQUIRE(created_array.size() == override_node_array.size());
		REQUIRE_FALSE(created_array.size() == created->get_child_count());

		// Iterate over all nodes, since the ordering is not guaranteed.
		for (int i = 0; i < override_node_array.size(); i++) {
			bool node_found = false;
			for (int j = 0; j < created_array.size(); j++) {
				if (override_node_array[i].identity_compare(created_array[j])) {
					node_found = true;
				}
			}
			CHECK(node_found);
		}
		root->queue_free();
		memdelete(scene);
	}
}

TEST_CASE("[SceneTree][InstancePlaceholder] Instance a PackedScene containing an InstancePlaceholder with no overrides") {
	GDREGISTER_CLASS(_TestInstancePlaceholderNode);

	// Create the internal scene.
	_TestInstancePlaceholderNode *internal = memnew(_TestInstancePlaceholderNode);
	internal->set_name("InternalNode");
	Node *referenced = memnew(Node);
	referenced->set_name("OriginalReference");
	internal->add_child(referenced);
	referenced->set_owner(internal);
	internal->set_reference_property(referenced);

	// Pack the internal scene.
	PackedScene *internal_scene = memnew(PackedScene);
	Error err = internal_scene->pack(internal);
	REQUIRE(err == OK);

	const String internal_path = TestUtils::get_temp_path("instance_placeholder_test_internal.tscn");
	err = ResourceSaver::save(internal_scene, internal_path);
	REQUIRE(err == OK);

	Ref<PackedScene> internal_scene_loaded = ResourceLoader::load(internal_path, "PackedScene", ResourceFormatLoader::CacheMode::CACHE_MODE_IGNORE, &err);
	REQUIRE(err == OK);

	// Create the main scene.
	Node *root = memnew(Node);
	root->set_name("MainNode");
	Node *overriding = memnew(Node);
	overriding->set_name("OverridingReference");

	_TestInstancePlaceholderNode *internal_created = Object::cast_to<_TestInstancePlaceholderNode>(internal_scene_loaded->instantiate(PackedScene::GEN_EDIT_STATE_MAIN_INHERITED));
	internal_created->set_scene_instance_load_placeholder(true);
	root->add_child(internal_created);
	internal_created->set_owner(root);

	root->add_child(overriding);
	overriding->set_owner(root);
	// Here we introduce an error, we override the property with an internal node to the instance placeholder.
	// The InstancePlaceholder is now forced to properly resolve the Node.
	internal_created->set("reference_property", NodePath("OriginalReference"));

	// Pack the main scene.
	PackedScene *main_scene = memnew(PackedScene);
	err = main_scene->pack(root);
	REQUIRE(err == OK);

	const String main_path = TestUtils::get_temp_path("instance_placeholder_test_main.tscn");
	err = ResourceSaver::save(main_scene, main_path);
	REQUIRE(err == OK);

	// // Instantiate the scene.
	Ref<PackedScene> main_scene_loaded = ResourceLoader::load(main_path, "PackedScene", ResourceFormatLoader::CacheMode::CACHE_MODE_IGNORE, &err);
	REQUIRE(err == OK);

	Node *instanced_main_node = main_scene_loaded->instantiate();
	REQUIRE(instanced_main_node != nullptr);
	SceneTree::get_singleton()->get_root()->add_child(instanced_main_node);
	CHECK(instanced_main_node->get_name() == "MainNode");
	REQUIRE(instanced_main_node->get_child_count() == 2);
	InstancePlaceholder *instanced_placeholder = Object::cast_to<InstancePlaceholder>(instanced_main_node->get_child(0, true));
	REQUIRE(instanced_placeholder != nullptr);

	_TestInstancePlaceholderNode *final_node = Object::cast_to<_TestInstancePlaceholderNode>(instanced_placeholder->create_instance(true));
	REQUIRE(final_node != nullptr);
	REQUIRE(final_node->get_child_count() == 1);
	REQUIRE(final_node->get_reference_property().identity_compare(final_node->get_child(0, true)));

	instanced_main_node->queue_free();
	memdelete(overriding);
	memdelete(root);
	memdelete(internal);
	DirAccess::remove_file_or_error(internal_path);
	DirAccess::remove_file_or_error(main_path);
}

TEST_CASE("[SceneTree][InstancePlaceholder] Instance a PackedScene containing an InstancePlaceholder with overrides") {
	GDREGISTER_CLASS(_TestInstancePlaceholderNode);

	// Create the internal scene.
	_TestInstancePlaceholderNode *internal = memnew(_TestInstancePlaceholderNode);
	internal->set_name("InternalNode");
	Node *referenced = memnew(Node);
	referenced->set_name("OriginalReference");
	internal->add_child(referenced);
	referenced->set_owner(internal);
	internal->set_reference_property(referenced);

	Node *array_ref1 = memnew(Node);
	array_ref1->set_name("ArrayRef1");
	internal->add_child(array_ref1);
	array_ref1->set_owner(internal);
	Node *array_ref2 = memnew(Node);
	array_ref2->set_name("ArrayRef2");
	internal->add_child(array_ref2);
	array_ref2->set_owner(internal);
	Array referenced_array;
	referenced_array.set_typed(Variant::OBJECT, "Node", Variant());
	referenced_array.push_back(array_ref1);
	referenced_array.push_back(array_ref2);
	internal->set_reference_array_property(referenced_array);

	// Pack the internal scene.
	PackedScene *internal_scene = memnew(PackedScene);
	Error err = internal_scene->pack(internal);
	REQUIRE(err == OK);

	const String internal_path = TestUtils::get_temp_path("instance_placeholder_test_internal_override.tscn");
	err = ResourceSaver::save(internal_scene, internal_path);
	REQUIRE(err == OK);

	Ref<PackedScene> internal_scene_loaded = ResourceLoader::load(internal_path, "PackedScene", ResourceFormatLoader::CacheMode::CACHE_MODE_IGNORE, &err);
	REQUIRE(err == OK);

	// Create the main scene.
	Node *root = memnew(Node);
	root->set_name("MainNode");
	Node *overriding = memnew(Node);
	overriding->set_name("OverridingReference");
	Node *array_ext = memnew(Node);
	array_ext->set_name("ExternalArrayMember");

	_TestInstancePlaceholderNode *internal_created = Object::cast_to<_TestInstancePlaceholderNode>(internal_scene_loaded->instantiate(PackedScene::GEN_EDIT_STATE_MAIN_INHERITED));
	internal_created->set_scene_instance_load_placeholder(true);
	root->add_child(internal_created);
	internal_created->set_owner(root);

	root->add_child(overriding);
	overriding->set_owner(root);
	root->add_child(array_ext);
	array_ext->set_owner(root);
	// Here we introduce an error, we override the property with an internal node to the instance placeholder.
	// The InstancePlaceholder is now forced to properly resolve the Node.
	internal_created->set_reference_property(overriding);
	Array internal_array = internal_created->get_reference_array_property();
	Array override_array;
	override_array.set_typed(Variant::OBJECT, "Node", Variant());
	for (int i = 0; i < internal_array.size(); i++) {
		override_array.push_back(internal_array[i]);
	}
	override_array.push_back(array_ext);
	internal_created->set_reference_array_property(override_array);

	// Pack the main scene.
	PackedScene *main_scene = memnew(PackedScene);
	err = main_scene->pack(root);
	REQUIRE(err == OK);

	const String main_path = TestUtils::get_temp_path("instance_placeholder_test_main_override.tscn");
	err = ResourceSaver::save(main_scene, main_path);
	REQUIRE(err == OK);

	// // Instantiate the scene.
	Ref<PackedScene> main_scene_loaded = ResourceLoader::load(main_path, "PackedScene", ResourceFormatLoader::CacheMode::CACHE_MODE_IGNORE, &err);
	REQUIRE(err == OK);

	Node *instanced_main_node = main_scene_loaded->instantiate();
	REQUIRE(instanced_main_node != nullptr);
	SceneTree::get_singleton()->get_root()->add_child(instanced_main_node);
	CHECK(instanced_main_node->get_name() == "MainNode");
	REQUIRE(instanced_main_node->get_child_count() == 3);
	InstancePlaceholder *instanced_placeholder = Object::cast_to<InstancePlaceholder>(instanced_main_node->get_child(0, true));
	REQUIRE(instanced_placeholder != nullptr);

	_TestInstancePlaceholderNode *final_node = Object::cast_to<_TestInstancePlaceholderNode>(instanced_placeholder->create_instance(true));
	REQUIRE(final_node != nullptr);
	REQUIRE(final_node->get_child_count() == 3);
	REQUIRE(final_node->get_reference_property().identity_compare(instanced_main_node->get_child(1, true)));
	Array final_array = final_node->get_reference_array_property();
	REQUIRE(final_array.size() == 3);
	Array wanted_node_array;
	wanted_node_array.push_back(instanced_main_node->get_child(2, true)); // ExternalArrayMember
	wanted_node_array.push_back(final_node->get_child(1, true)); // ArrayRef1
	wanted_node_array.push_back(final_node->get_child(2, true)); // ArrayRef2

	// Iterate over all nodes, since the ordering is not guaranteed.
	for (int i = 0; i < wanted_node_array.size(); i++) {
		bool node_found = false;
		for (int j = 0; j < final_array.size(); j++) {
			if (wanted_node_array[i].identity_compare(final_array[j])) {
				node_found = true;
			}
		}
		CHECK(node_found);
	}

	instanced_main_node->queue_free();
	memdelete(array_ext);
	memdelete(overriding);
	memdelete(root);
	memdelete(internal);
	DirAccess::remove_file_or_error(internal_path);
	DirAccess::remove_file_or_error(main_path);
}

} //namespace TestInstancePlaceholder

#endif // TEST_INSTANCE_PLACEHOLDER_H