code: def init_class_fixtures(cls):
      super(LabelArrayTestCase, cls).init_class_fixtures()
  
      cls.rowvalues = row = [
          "",
          "a",
          "b",
          "ab",
          "a",
          "",
          "b",
          "ab",
          "z",
      ]
      cls.strs = np.array(
          [rotN(row, i) for i in range(3)], dtype=object
      )
  
imports: from itertools import product
  from operator import eq, ne
  import warnings
  import numpy
  from toolz import take
  from zipline.lib.labelarray import LabelArray
  from zipline.testing import check_arrays, parameter_space, ZiplineTestCase
  from zipline.testing.predicates import assert_equal
  from zipline.utils.compat import unicode
label_desc: Use image node_id 1 for calling the LabelArrayTestCase obj's underlying member method code with example usage: obj.init_class_fixtures(cls) without return types