Forgot a ton of files in the last commit.

tests/sound.cpp

@@ -0,0 +1,14 @@
+#include <catch2/catch_test_macros.hpp>
+#include <fmt/core.h>
+#include <string>
+#include "sound.hpp"
+
+using namespace fmt;
+
+TEST_CASE("test sound manager", "[sound]") {
+  sound::init();
+
+  sound::play("blank");
+
+  sound::play_at("blank", 0.1, 0.1, 0.1);
+}