code: def test_single_data_type(self, data_type):
      schema = {
          "A": data_type,
          "b": data_type,
          0: data_type,
          (0, 1): data_type,
          True: data_type,
      }
  
      mapper = VariableFeatureMapper(schema=schema)
  
      assert all(
          x in schema
          for x in mapper.get_var_of_type(
              data_type=data_type.split(":")[0]
              if "categorical" in data_type
              else data_type
          )
      )
  
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 12 for calling the TestVariableFeatureMapper obj's underlying member method code with example usage: obj.test_single_data_type(data_type) without return types