old_contents: """Test radix sort."""
  import pytest
  
  
  def test_radix_sort():
      """Assert that it works."""
      from radix import radix_sort
      radix_return_val = [56, 93, 7, 11]
      assert radix_sort(radix_return_val) == [7, 11, 56, 93]
  
  
  def test_string_in_list():
      """Assert error is raised input."""
      from radix import radix_sort
      with pytest.raises(TypeError):
          radix_sort([1, 45, 'a', 5])
  
  
  def test_empty_list():
      """Assert empty list is None."""
      from radix import radix_sort
      alist = []
      radix_sort(alist)
      assert radix_sort(alist) == []
  
new_contents: """Test radix sort."""
  import pytest
  
  
  def test_radix_sort():
      """Assert that it works."""
      from radix import radix_sort
      radix_return_val = [56, 93, 7, 11]
      assert radix_sort(radix_return_val) == [7, 11, 56, 93]
  
  
  def test_string_in_list():
      """Assert error is raised input."""
      from radix import radix_sort
      with pytest.raises(TypeError):
          radix_sort([1, 45, 'a', 5])
  
  
  def test_empty_list():
      """Assert empty list is None."""
      from radix import radix_sort
      alist = []
      radix_sort(alist)
      assert radix_sort(alist) == []
  
  
  def test_same_items_in_list():
      """Assert list remins the same."""
      from radix import radix_sort
      alist = [1, 1, 1, 1]
      radix_sort(alist)
      assert radix_sort(alist) == [1, 1, 1, 1]
  
subject: test same remains list