code: def test_narrow_condense_back_to_valid_size(self):
      categories = ["a"] * (2**8 + 1)
      arr = LabelArray(categories, missing_value=categories[0])
      assert_equal(arr.itemsize, 1)
      self.check_roundtrip(arr)
  
      # longer than int16 but still fits when deduped
      categories = self.create_categories(16, plus_one=False)
      categories.append(categories[0])
      arr = LabelArray(categories, missing_value=categories[0])
      assert_equal(arr.itemsize, 2)
      self.check_roundtrip(arr)
  
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 18 for calling the LabelArrayTestCase obj's underlying member method code with example usage: obj.test_narrow_condense_back_to_valid_size() without return types