code: def test_call_works_when_separator_is_specified(self) -> None:
      # fmt: off
          s = "23 9 12  abc 34 ~~  90 \t 1  "
  
          splitter = StrSplitter(sep=" ")
  
          assert splitter(s) == ["23", "9", "12", "", "abc", "34", "~~", "", "90", "\t", "1", "", ""]
  
file_path: fairseq2/tests/unit/data/text/test_str_splitter.py
imports: from typing import Sequence
  import pytest
  from fairseq2.data.text.converters import StrSplitter
label_desc: Use image node_id 4 for calling the TestStrSplitter obj's underlying member method code with example usage: obj.test_call_works_when_separator_is_specified() without return types