Properly link flecs library

engine/libs/flecs/test/addons/src/Rest.c

@@ -0,0 +1,33 @@
+#include <addons.h>
+
+void Rest_teardown(void) {
+    ecs_world_t *world = ecs_init();
+
+    ecs_singleton_set(world, EcsRest, {27760});
+
+    ecs_fini(world);
+
+    test_assert(true); // Ensure teardown was successful
+}
+
+void Rest_get(void) {
+    ecs_world_t *world = ecs_init();
+
+    ecs_http_server_t *srv = ecs_rest_server_init(world, NULL);
+    test_assert(srv != NULL);
+
+    ecs_http_reply_t reply = ECS_HTTP_REPLY_INIT;
+    test_int(0, ecs_http_server_request(srv, "GET",
+        "/entity/flecs/core/World?label=true", &reply));
+    test_int(reply.code, 200);
+    
+    char *reply_str = ecs_strbuf_get(&reply.body);
+    test_assert(reply_str != NULL);
+    test_str(reply_str,
+        "{\"path\":\"flecs.core.World\", \"label\":\"World\", \"ids\":[]}");
+    ecs_os_free(reply_str);
+
+    ecs_rest_server_fini(srv);
+
+    ecs_fini(world);
+}