code: def test_get_indices_valuerror(self, mapper, invalid_input):
      with pytest.raises(
          ValueError, match="Provide a valid variable name"
      ):
          mapper.get_indices(invalid_input)
  
imports: from collections import OrderedDict
  import pytest
  from causalnex.structure import StructureModel
  from causalnex.structure.categorical_variable_mapper import VariableFeatureMapper, validate_schema
label_desc: Use image node_id 7 for calling the TestVariableFeatureMapper obj's underlying member method code with example usage: obj.test_get_indices_valuerror(mapper, invalid_input) without return types