code: def test_exceptions(self):
      # Check for ValueError when called with invalid string data.
      assert_raises(ValueError, matrix, "invalid")
  
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 2 for calling the TestCtor obj's underlying member method code with example usage: obj.test_exceptions() without return types