Test build GNnative library in CI

test/src/init.cpp

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+#include <Godot.hpp>
+#include <Reference.hpp>
+
+using namespace godot;
+
+class SimpleClass : public Reference {
+	GODOT_CLASS(SimpleClass, Reference);
+
+public:
+	SimpleClass() {}
+
+	/** `_init` must exist as it is called by Godot. */
+	void _init() {}
+
+	void test_void_method() {
+		Godot::print("This is test");
+	}
+
+	Variant method(Variant arg) {
+		Variant ret;
+		ret = arg;
+
+		return ret;
+	}
+
+	static void _register_methods() {
+		register_method("method", &SimpleClass::method);
+
+		/**
+		 * The line below is equivalent to the following GDScript export:
+		 *	 export var _name = "SimpleClass"
+		 **/
+		register_property<SimpleClass, String>("base/name", &SimpleClass::_name, String("SimpleClass"));
+
+		/** Alternatively, with getter and setter methods: */
+		register_property<SimpleClass, int>("base/value", &SimpleClass::set_value, &SimpleClass::get_value, 0);
+
+		/** Registering a signal: **/
+		register_signal<SimpleClass>("signal_name0");
+		register_signal<SimpleClass>("signal_name1", "string_argument", GODOT_VARIANT_TYPE_STRING);
+	}
+
+	String _name;
+	int _value;
+
+	void set_value(int p_value) {
+		_value = p_value;
+	}
+
+	int get_value() const {
+		return _value;
+	}
+};
+
+/** GDNative Initialize **/
+extern "C" void GDN_EXPORT godot_gdnative_init(godot_gdnative_init_options *o) {
+	godot::Godot::gdnative_init(o);
+}
+
+/** GDNative Terminate **/
+extern "C" void GDN_EXPORT godot_gdnative_terminate(godot_gdnative_terminate_options *o) {
+	godot::Godot::gdnative_terminate(o);
+}
+
+/** NativeScript Initialize **/
+extern "C" void GDN_EXPORT godot_nativescript_init(void *handle) {
+	godot::Godot::nativescript_init(handle);
+
+	godot::register_class<SimpleClass>();
+}