code: def test_invalid(self):
      for args in self.invalid:
          with pytest.raises(args[-1]):
              tools.concat(*args[:-1])
  
imports: import pytest
  import numpy
  from numpy.testing import assert_allclose, assert_equal, assert_array_less, assert_array_equal, assert_almost_equal
  import pandas
  from scipy.linalg import solve_discrete_lyapunov
  from statsmodels.tsa.statespace import tools
  from statsmodels.tsa.stattools import acovf
label_desc: Use image node_id 2 for calling the TestConcat obj's underlying member method code with example usage: obj.test_invalid() without return types