if err := batch.Add(i, i); err != nil {
			t.Fatalf("failed to add %v; %v", i, err)
		}
		if _, ok := batch.GetByKey(i); !ok {
			t.Fatalf("failed to get the item by key %v after adding", i)
		}
	}
	err := batch.Add(101, 101)
	if err == nil || !errors.Is(err, ErrBatchFull) {
		t.Fatalf("Expected err %v but got %v", ErrBatchFull, err)
	}
	if !batch.IsFull() {
		t.Fatal("Expected batch.IsFull to be true but got false")
	}