test: added test case for 0 radius entity check

code/tests/cases/query.h

@@ -575,4 +575,29 @@ MODULE(query, {
 
         librg_world_destroy(world);
     });
+
+    IT("should query entities with 0 radius", {
+        librg_world *world = librg_world_create();
+        r = librg_config_chunkamount_set(world, 3, 3, 1); EQUALS(r, LIBRG_OK);
+        r = librg_config_chunkoffset_set(world, LIBRG_OFFSET_BEG, LIBRG_OFFSET_BEG, LIBRG_OFFSET_BEG);
+
+        r = librg_entity_track(world, 1); EQUALS(r, LIBRG_OK);
+        r = librg_entity_track(world, 2); EQUALS(r, LIBRG_OK);
+        r = librg_entity_track(world, 3); EQUALS(r, LIBRG_OK);
+
+        r = librg_entity_chunk_set(world, 1, 1); EQUALS(r, LIBRG_OK);
+        r = librg_entity_chunk_set(world, 2, 1); EQUALS(r, LIBRG_OK);
+        r = librg_entity_chunk_set(world, 3, 2); EQUALS(r, LIBRG_OK);
+
+        r = librg_entity_owner_set(world, 2, 1); EQUALS(r, LIBRG_OK);
+
+        int64_t results[16] = {0};
+        size_t amt = 16;
+        librg_world_query(world, 1, 0, results, &amt);
+        EQUALS(amt, 2);
+        EQUALS(results[0], 2); // own entity first
+        EQUALS(results[1], 1);
+
+        librg_world_destroy(world);
+    });
 });