code: def test_unicode_string():
      s = tree.String(None, u("bö"), (0, 0))
      assert repr(s)
  
imports: from textwrap import dedent
  import pytest
  from parso._compatibility import u
  from parso import parse
  from parso.python import tree
  from parso.utils import split_lines
label_desc: Use image node_id 10 for calling a global function with example usage: test_unicode_string() without return types