code: def test_pinv(self):
      x = matrix(np.arange(6).reshape(2, 3))
      xpinv = matrix(
          [
              [-0.77777778, 0.27777778],
              [-0.11111111, 0.11111111],
              [0.55555556, -0.05555556],
          ]
      )
      assert_almost_equal(x.I, xpinv)
  
imports: import collections.abc
  import numpy
  from numpy import matrix, asmatrix, bmat
  from numpy.testing import assert_, assert_equal, assert_almost_equal, assert_array_equal, assert_array_almost_equal, assert_raises
  from numpy.linalg import matrix_power
  from numpy.matrixlib import mat
label_desc: Use image node_id 8 for calling the TestProperties obj's underlying member method code with example usage: obj.test_pinv() without return types