basic ECS spawner

addons/gecs/tests/systems/s_test_nonexistent_group.gd

@@ -0,0 +1,12 @@
+class_name TestSystemNonexistentGroup
+extends System
+
+var entities_found := []
+
+
+func query():
+	return q.with_group(["NonexistentGroup"])
+
+
+func process(entities: Array[Entity], components: Array, delta: float) -> void:
+	entities_found = entities.duplicate()