code: def test_setitem_str_trailing_null(n):
      trailing_nulls = "\x00" * n
      s = cudf.Series(["a", "b", "c" + trailing_nulls])
      assert s[2] == "c" + trailing_nulls
      s[0] = "a" + trailing_nulls
      assert s[0] == "a" + trailing_nulls
      s[1] = trailing_nulls
      assert s[1] == trailing_nulls
      s[0] = ""
      assert s[0] == ""
      s[0] = "\x00"
      assert s[0] == "\x00"
  
imports: import numpy
  import pandas
  import pytest
  import cudf
  from cudf.core._compat import PANDAS_GE_150
  from cudf.testing._utils import assert_eq, assert_exceptions_equal
label_desc: Use image node_id 19 for calling a global function with example usage: test_setitem_str_trailing_null(n) without return types