nref: add tests

test/CMakeLists.txt

@@ -18,6 +18,10 @@ include(Catch)
 add_executable(neo_test neo_test.cpp)
 include(string/string.cmake)
 
+target_sources(neo_test PRIVATE
+    nref.cpp
+)
+
 target_link_libraries(neo_test PRIVATE neo Catch2::Catch2)
 
 catch_discover_tests(neo_test)

test/nref.cpp

@@ -0,0 +1,80 @@
+/** See the end of this file for copyright and license terms. */
+
+#include <catch2/catch.hpp>
+#include <errno.h>
+
+#include <neo.h>
+
+struct nref_test {
+	NREF_FIELD;
+	std::function<void(void)> cb;
+	nref_test(std::function<void(void)> cb)
+	{
+		this->cb = cb;
+	}
+};
+
+void test_destroy(struct nref_test *ptr)
+{
+	ptr->cb();
+	delete ptr;
+}
+
+SCENARIO( "nref: call destroy callback when count reaches 0", "[src/nref.c]" )
+{
+	GIVEN( "structure is initialized" )
+	{
+		bool called = false;
+		struct nref_test *instance = new nref_test([&called]() {
+			called = true;
+		});
+		nref_init(instance, test_destroy);
+
+		REQUIRE( !called );
+
+		WHEN( "nget is called" )
+		{
+			nget(instance);
+
+			THEN( "destroy is not called" )
+			{
+				REQUIRE( !called );
+			}
+		}
+
+		WHEN( "nput is called" )
+		{
+			nput(instance);
+
+			THEN( "destroy is called" )
+			{
+				REQUIRE( instance == nil );
+			}
+		}
+
+		WHEN( "nget is called, then nput is called twice" )
+		{
+			nget(instance);
+			nput(instance);
+			nput(instance);
+
+			THEN( "destroy is called" )
+			{
+				REQUIRE( called );
+			}
+		}
+	}
+}
+
+/*
+ * This file is part of libneo.
+ * Copyright (c) 2021 Fefie <owo@fef.moe>.
+ *
+ * libneo is non-violent software: you may only use, redistribute,
+ * and/or modify it under the terms of the CNPLv6+ as found in
+ * the LICENSE file in the source code root directory or at
+ * <https://git.pixie.town/thufie/CNPL>.
+ *
+ * libneo comes with ABSOLUTELY NO WARRANTY, to the extent
+ * permitted by applicable law.  See the CNPLv6+ for details.
+ */