code: def testConstantInput(self):
      # we only test starting from the 1000th position, because we need to wait
      # for the filter to stabilize
      self.assertAlmostEqualVector(
          DCRemoval()(ones(20000))[1000:], zeros(20000)[1000:], 3.3e-3
      )
  
file_path: essentia/test/src/unittests/filters/test_dcremoval.py
imports: from essentia_test import *
label_desc: Use image node_id 5 for calling the TestDCRemoval obj's underlying member method code with example usage: obj.testConstantInput() without return types