class_docstr: Base class for ExtensionDtype classes
class_docstr_tok: ["Base","class","for","ExtensionDtype","classes"]
code: def test_infer_dtype(self, data, data_missing, skipna):
      # only testing that this works without raising an error
      res = infer_dtype(data, skipna=skipna)
      assert isinstance(res, str)
      res = infer_dtype(data_missing, skipna=skipna)
      assert isinstance(res, str)
  
imports: import numpy
  import pytest
  import pandas
  import pandas._testing
  from pandas.api.types import infer_dtype, is_object_dtype, is_string_dtype
label_desc: Use image node_id 21 for calling the BaseDtypeTests obj's underlying member method code with example usage: obj.test_infer_dtype(data, data_missing, skipna) without return types