new_contents: """
  intervaltree: A mutable, self-balancing interval tree for Python 2 and 3.
  Queries may be by point, by range overlap, or by range envelopment.
  
  Test module: IntervalTree, insertion of a sequence of intervals caused
  invariant violation
  Submitted as issue #67 by suola
  
  Copyright 2013-2018 Chaim-Leib Halbert
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
     http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  """
  from __future__ import absolute_import
  from intervaltree import IntervalTree
  import pytest
  
  intervals = (
      (3657433088, 3665821696),
      (2415132672, 2415394816),
      (201326592, 268435456),
      (163868672, 163870720),
      (3301965824, 3303014400),
      (4026531840, 4294967296),
      (3579899904, 3579904000),
      (3439329280, 3443523584),
      (3431201536, 3431201664),
      (3589144576, 3589275648),
      (2531000320, 2531033088),
      (4187287552, 4187291648),
      (3561766912, 3561783296),
      (3046182912, 3046187008),
      (3506438144, 3506962432),
      (3724953872, 3724953888),
      (3518234624, 3518496768),
      (3840335872, 3840344064),
      (3492279181, 3492279182),
      (3447717888, 3456106496),
      (3589390336, 3589398528),
      (3486372962, 3486372963),
      (3456106496, 3472883712),
      (3508595496, 3508595498),
      (3511853376, 3511853440),
      (3452226160, 3452226168),
      (3544510720, 3544510736),
      (3525894144, 3525902336),
      (3524137920, 3524137984),
      (3508853334, 3508853335),
      (3467337728, 3467341824),
      (3463212256, 3463212260),
      (3446643456, 3446643712),
      (3473834176, 3473834240),
      (3487039488, 3487105024),
      (3444686112, 3444686144),
      (3459268608, 3459276800),
      (3483369472, 3485466624),
  )
  
  tree = IntervalTree()
  
  for interval in intervals:
      tree.addi(*interval)
  tree.verify()
  
  
subject: test for #67