code: def testQuadraticSpline(self):
      expected = readVector(join(filedir(), "spline/qSpline.txt"))
      self.evaluateQuadraticSpline(expected)
  
file_path: essentia/test/src/unittests/standard/test_spline.py
imports: from essentia_test import *
  from essentia.standard import *
  from numpy import r_, sin, pi
label_desc: Use image node_id 9 for calling the TestSpline obj's underlying member method code with example usage: obj.testQuadraticSpline() without return types