code: def test_get_feature_names(self, mapper, schema):
      for var_name, var_schema in schema.items():
          if var_schema in ("binary", "continuous"):
              assert mapper.get_feature_names(var_name) == var_name
          elif "categorical" in var_schema:
              assert all(
                  x.startswith(str(var_name))
                  for x in mapper.get_feature_names(var_name)
              )
              assert len(mapper.get_feature_names(var_name)) == int(
                  var_schema.split(":")[1]
              )
              # assert False
      assert all(
          x in mapper.get_feature_names() for x in mapper.feature_list
      )
  
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 9 for calling the TestVariableFeatureMapper obj's underlying member method code with example usage: obj.test_get_feature_names(mapper, schema) without return types