code: def test_unpack_first_level(self, arraylike):
      # We unpack exactly one level of array likes
      obj = np.array([None])
      obj[0] = np.array(1.2)
      # the length of the included item, not of the float dtype
      length = len(str(obj[0]))
      expected = np.dtype(f"S{length}")
  
      obj = arraylike(obj)
      # casting to string usually calls str(obj)
      arr = np.array([obj], dtype="S")
      assert arr.shape == (1, 1)
      assert arr.dtype == expected
  
imports: from itertools import permutations, product
  import pytest
  from pytest import param
  import numpy
  import numpy._core._multiarray_umath
  from numpy._core._rational_tests import rational
  from numpy.testing import assert_array_equal, assert_warns, IS_PYPY
label_desc: Use image node_id 3 for calling the TestStringDiscovery obj's underlying member method code with example usage: obj.test_unpack_first_level(arraylike) without return types