text: import os
  import unittest
  
  from monty.json import MontyDecoder
  from monty.serialization import loadfn
  
  from robocrys.util import load_condensed_structure_json
  
  
  class RobocrysTest(unittest.TestCase):
      """Base test class providing access to common test data."""
  
      _module_dir = os.path.dirname(os.path.abspath(__file__))
      _structures_dir = os.path.join(_module_dir, "structures")
      _condensed_structures_dir = os.path.join(_module_dir, "condensed_structures")
  
      _test_structures = {}
      for _fn in os.listdir(_structures_dir):
          if ".json.gz" in _fn:
              _test_structures[_fn.split(".")[0]] = loadfn(
                  os.path.join(_structures_dir, _fn), cls=MontyDecoder
              )
  
      _test_condensed_structures = {}
      for _fn in os.listdir(_condensed_structures_dir):
          if ".json.gz" in _fn:
              _test_condensed_structures[
                  _fn.split(".")[0]
              ] = load_condensed_structure_json(
                  os.path.join(_condensed_structures_dir, _fn)
              )
  
      @classmethod
      def get_structure(cls, name):
          return cls._test_structures[name].copy()
  
      @classmethod
      def get_condensed_structure(cls, name):
          return cls._test_condensed_structures[name].copy()
  