code: def test_expression_to_contrast_vector_error():
      with pytest.raises(
          ValueError, match="invalid python identifiers"
      ):
          expression_to_contrast_vector(
              expression="0-1", design_columns=["0", "1"]
          )
  
imports: import numpy
  import pytest
  import scipy.stats
  from numpy.testing import assert_almost_equal
  from sklearn.datasets import make_regression
  from sklearn.linear_model import LinearRegression
  from nilearn.glm.contrasts import Contrast, _compute_fixed_effects_params, compute_contrast, compute_fixed_effect_contrast, expression_to_contrast_vector
  from nilearn.glm.first_level import run_glm
label_desc: Use image node_id 2 for calling a global function with example usage: test_expression_to_contrast_vector_error() without return types