code: def test_dtypes(dtype):
      # smoke tests on auto dtype construction
  
      if dtype.is_signed_integer:
          assert np.dtype(dtype.type).kind == "i"
      else:
          assert np.dtype(dtype.type).kind == "u"
      assert dtype.name is not None
  
file_path: pandas/pandas/tests/arrays/integer/test_repr.py
imports: import numpy
  import pytest
  import pandas
  from pandas.core.arrays.integer import Int8Dtype, Int16Dtype, Int32Dtype, Int64Dtype, UInt8Dtype, UInt16Dtype, UInt32Dtype, UInt64Dtype
label_desc: Use image node_id 1 for calling a global function with example usage: test_dtypes(dtype) without return types