code: def test_diff_int(self):
      # int dtype
      a = 10000000000000000
      b = a + 1
      ser = Series([a, b])
  
      result = ser.diff()
      assert result[1] == 1
  
file_path: pandas/pandas/tests/series/methods/test_diff.py
imports: import numpy
  import pytest
  from pandas import Series, TimedeltaIndex, date_range
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestSeriesDiff obj's underlying member method code with example usage: obj.test_diff_int() without return types