@Test public void concatenate_input_bucketsEmpty_elementsEmpty_then_nothingHappens() throws Exception { concatenate(new ArrayList[0], new Integer[0]); }
private void concatenate(ArrayList<Integer>[] buckets, Integer[] elements) { }
RadixSort { private void concatenate(ArrayList<Integer>[] buckets, Integer[] elements) { } }
RadixSort { private void concatenate(ArrayList<Integer>[] buckets, Integer[] elements) { }  }
RadixSort { private void concatenate(ArrayList<Integer>[] buckets, Integer[] elements) { }  void sort(Integer[] elements); }
RadixSort { private void concatenate(ArrayList<Integer>[] buckets, Integer[] elements) { }  void sort(Integer[] elements);  }