class_docstr: Unit tests for Base class. 
class_docstr_tok: ["Unit","tests","for","Base","class","."]
docstr: Child set up. 
docstr_tok: ["Child","set","up","."]
code: def _child_set_up(self):
      """Child set up."""
      raise NotImplementedError("Implement in a child class.")
  
imports: from __future__ import absolute_import
  import numpy
  from .None import domains
  from ..utils.general_utils import map_to_bounds
  from ..utils.base_test_class import BaseTestClass, execute_tests
label_desc: Use image node_id 2 for calling the DomainBaseTestCase obj's underlying member method code with example usage: obj._child_set_up() without return types