code: def testRegression(self):
      input = [5.0, 0.0, -1.0, 2.0, -3.0, 4.0]
      result = self.accumulate(input)
      self.assertEqualVector(result, input)
  
file_path: essentia/test/src/unittests/standard/test_realaccumulator_streaming.py
imports: from essentia_test import *
  from essentia.streaming import RealAccumulator
label_desc: Use image node_id 4 for calling the TestRealAccumulator_Streaming obj's underlying member method code with example usage: obj.testRegression() without return types