code: def testConstant(self):
      self.assertEqual(Flatness()([23]), 1)
      self.assertAlmostEqual(Flatness()([12] * 237), 1, 1e-5)
  
file_path: essentia/test/src/unittests/stats/test_flatness.py
imports: from essentia_test import *
label_desc: Use image node_id 2 for calling the TestFlatness obj's underlying member method code with example usage: obj.testConstant() without return types