code: def test_subspace(self):
      space = [
          {
              "name": "var_1",
              "type": "continuous",
              "domain": (-1, 1),
              "dimensionality": 2,
          },
          {
              "name": "var_2",
              "type": "categorical",
              "domain": ("r", "g", "b"),
          },
          {"name": "var_3", "type": "discrete", "domain": (0, 1, 2, 3)},
      ]
      dims = [0, 2, 5]
      design_space = Design_space(space)
  
      subspace = design_space.get_subspace(dims)
  
      self.assertEqual(len(subspace), 3)
      self.assertTrue(
          any(v for v in subspace if isinstance(v, ContinuousVariable))
      )
      self.assertTrue(
          any(v for v in subspace if isinstance(v, DiscreteVariable))
      )
      self.assertTrue(
          any(v for v in subspace if isinstance(v, CategoricalVariable))
      )
  
imports: import numpy
  import unittest
  from GPyOpt.core.task.space import Design_space
  from GPyOpt.core.task.variables import BanditVariable, DiscreteVariable, CategoricalVariable, ContinuousVariable
  from GPyOpt.core.errors import InvalidConfigError
label_desc: Use image node_id 17 for calling the TestDesignSpace obj's underlying member method code with example usage: obj.test_subspace() without return types