code: def test_diff_int_dtype(self):
      # int dtype
      a = 10_000_000_000_000_000
      b = a + 1
      ser = Series([a, b])
  
      rs = DataFrame({"s": ser}).diff()
      assert rs.s[1] == 1
  
imports: import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Series, Timestamp, date_range
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestDataFrameDiff obj's underlying member method code with example usage: obj.test_diff_int_dtype() without return types