code: def test_invalid_params():
      pits = np.arange(1, 100.0) / 100.0
      dist = Normal()
      with pytest.raises(ValueError):
          dist.ppf(pits, [1.0])
      dist = StudentsT()
      with pytest.raises(ValueError):
          dist.ppf(pits, [1.0])
  
file_path: arch/arch/tests/univariate/test_distribution.py
imports: import numpy
  from numpy.random import RandomState, default_rng
  from numpy.testing import assert_almost_equal, assert_array_equal, assert_equal
  import pytest
  from scipy.special import gamma, gammaln
  import scipy.stats
  from arch.univariate.distribution import GeneralizedError, Normal, SkewStudent, StudentsT
label_desc: Use image node_id 5 for calling a global function with example usage: test_invalid_params() without return types