code: def test_file_like():
      # Test returning file object or filename
      fh = FileHolder("a_fname")
      assert fh.file_like == "a_fname"
      bio = BytesIO()
      fh = FileHolder(fileobj=bio)
      assert fh.file_like is bio
      fh = FileHolder("a_fname", fileobj=bio)
      assert fh.file_like is bio
  
imports: from io import BytesIO
  from ..fileholders import FileHolder
label_desc: Use image node_id 3 for calling a global function with example usage: test_file_like() without return types