code: def test_select_dtypes_numeric(self, arr, expected):
      # GH 35340
  
      df = DataFrame(arr)
      is_selected = df.select_dtypes(np.number).shape == df.shape
      assert is_selected == expected
  
imports: import numpy
  import pytest
  from pandas.core.dtypes.dtypes import ExtensionDtype
  import pandas
  from pandas import DataFrame, Timestamp
  import pandas._testing
  from pandas.core.arrays import ExtensionArray
label_desc: Use image node_id 17 for calling the TestSelectDtypes obj's underlying member method code with example usage: obj.test_select_dtypes_numeric(arr, expected) without return types