code: def test_append_overlap_raises(self, float_frame):
      msg = "Indexes have overlapping values"
      with pytest.raises(ValueError, match=msg):
          float_frame._append(float_frame, verify_integrity=True)
  
imports: import datetime
  from itertools import combinations
  import dateutil
  import numpy
  import pytest
  import pandas
  from pandas import DataFrame, Index, Series, Timestamp, concat, isna
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestAppend obj's underlying member method code with example usage: obj.test_append_overlap_raises(float_frame) without return types