code: def test_dtype_idempotent(any_numpy_dtype):
      dtype = NumpyEADtype(any_numpy_dtype)
  
      result = NumpyEADtype(dtype)
      assert result == dtype
  
imports: import numpy
  import pytest
  from pandas.core.dtypes.dtypes import NumpyEADtype
  import pandas
  import pandas._testing
  from pandas.arrays import NumpyExtensionArray
label_desc: Use image node_id 6 for calling a global function with example usage: test_dtype_idempotent(any_numpy_dtype) without return types