code: def testOneCol(self):
      mat = array([[1], [2], [3], [4], [5]])
      mean = array(3)
      cov = array([[2.5]])
      icov = array([[0.4]])
      outputMean, outputCov, outputInv = SingleGaussian()(mat)
      self.assertEqual(outputMean, mean)
      self.assertAlmostEqualMatrix(outputCov, cov)
      self.assertAlmostEqualMatrix(outputInv, icov)
      self.assertInverse(outputCov, outputInv)
  
file_path: essentia/test/src/unittests/stats/test_singlegaussian.py
imports: from essentia_test import *
  from numpy import dot
label_desc: Use image node_id 7 for calling the TestSingleGaussian obj's underlying member method code with example usage: obj.testOneCol() without return types