class_docstr: Tests allowable data formats when constructing
  the basic Element types.
code: def test_spline_clone(self):
      points = [(-0.3, -0.3), (0, 0), (0.25, -0.25), (0.3, 0.3)]
      spline = Spline((points, [])).clone()
      self.assertEqual(
          spline.dimension_values(0), np.array([-0.3, 0, 0.25, 0.3])
      )
      self.assertEqual(
          spline.dimension_values(1), np.array([-0.3, 0, -0.25, 0.3])
      )
  
file_path: holoviews/holoviews/tests/element/test_annotations.py
imports: import numpy
  import param
  import pytest
  from packaging.version import Version
  from holoviews import Annotation, Arrow, HLine, Spline, Text, VLine
  from holoviews.element import Points
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 7 for calling the AnnotationTests obj's underlying member method code with example usage: obj.test_spline_clone() without return types