4 files changed, 72 insertions, 1 deletions
diff --git a/src/test/AssetTest.cpp b/src/test/AssetTest.cpp
new file mode 100644
index 0000000..8aa7629
--- /dev/null
+++ b/src/test/AssetTest.cpp
@@ -0,0 +1,26 @@
+#include <gtest/gtest.h>
+
+#include <crepe/api/Asset.h>
+#include <crepe/api/Config.h>
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+class AssetTest : public Test {
+public:
+	Config & cfg = Config::get_instance();
+	void SetUp() override { this->cfg.asset.root_pattern = ".crepe-root"; }
+};
+
+TEST_F(AssetTest, Existant) { ASSERT_NO_THROW(Asset{"asset/texture/img.png"}); }
+
+TEST_F(AssetTest, Nonexistant) { ASSERT_ANY_THROW(Asset{"asset/nonexistant"}); }
+
+TEST_F(AssetTest, Rootless) {
+	cfg.asset.root_pattern.clear();
+
+	string arbitrary = "\\/this is / /../passed through as-is";
+	Asset asset{arbitrary};
+	ASSERT_EQ(arbitrary, asset.get_path());
+}
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index dc985a3..8cb4232 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -3,6 +3,9 @@ target_sources(test_main PUBLIC
 	PhysicsTest.cpp
 	ScriptTest.cpp
 	ParticleTest.cpp
+	AssetTest.cpp
+	OptionalRefTest.cpp
+	RenderSystemTest.cpp
 	EventTest.cpp
 	ECSTest.cpp
 	SceneManagerTest.cpp
diff --git a/src/test/OptionalRefTest.cpp b/src/test/OptionalRefTest.cpp
new file mode 100644
index 0000000..83f7b23
--- /dev/null
+++ b/src/test/OptionalRefTest.cpp
@@ -0,0 +1,42 @@
+#include <gtest/gtest.h>
+
+#include <crepe/util/OptionalRef.h>
+
+using namespace std;
+using namespace crepe;
+using namespace testing;
+
+TEST(OptionalRefTest, Normal) {
+	string value = "foo";
+	OptionalRef<string> ref = value;
+
+	EXPECT_TRUE(ref);
+	ASSERT_NO_THROW({
+		string & value_ref = ref;
+		EXPECT_EQ(value_ref, value);
+	});
+
+	ref.clear();
+	EXPECT_FALSE(ref);
+	ASSERT_THROW({ string & value_ref = ref; }, runtime_error);
+}
+
+TEST(OptionalRefTest, Empty) {
+	string value = "foo";
+	OptionalRef<string> ref;
+
+	EXPECT_FALSE(ref);
+	ASSERT_THROW({ string & value_ref = ref; }, runtime_error);
+}
+
+TEST(OptionalRefTest, Chain) {
+	string value = "foo";
+	OptionalRef<string> ref1 = value;
+	OptionalRef<string> ref2 = ref1;
+
+	EXPECT_TRUE(ref2);
+	string & value_ref = ref2;
+	EXPECT_EQ(value_ref, value);
+	value_ref = "bar";
+	EXPECT_EQ(value_ref, value);
+}
diff --git a/src/test/ParticleTest.cpp b/src/test/ParticleTest.cpp
index d9bbba0..eee022f 100644
--- a/src/test/ParticleTest.cpp
+++ b/src/test/ParticleTest.cpp
@@ -29,7 +29,7 @@ public:
 
 			Color color(0, 0, 0, 0);
 			Sprite & test_sprite = game_object.add_component<Sprite>(
-				make_shared<Texture>("../asset/texture/img.png"), color,
+				make_shared<Texture>("asset/texture/img.png"), color,
 				FlipSettings{true, true});
 
 			game_object.add_component<ParticleEmitter>(ParticleEmitter::Data{