old_contents: import os
  import hashlib
  from trackhub import helpers
  
  def test_example_data_md5s():
      data_dir = helpers.data_dir()
  
      data = [i.strip().split() for i in '''
      ba2fd8b22bcad65bb6583da937ff5222  newOrg1.2bit
      3735b696b3a416a59f8755eaf5664e5a  sine-hg38-0.bedgraph.bw
      73ad8ba3590d0895810d069599b0e443  sine-hg38-1.bedgraph.bw
      85478d1ecc5906405ccb43d1ca426d29  sine-hg38-2.bedgraph.bw
      55ac2603c31b232dacfdaba07d8a25eb  sine-no1-1000.bedgraph.bw
      b8c983862c58fee6afa99382634ab2d8  sine-no1-100.bedgraph.bw
      35fa6ac3453e2bbd503c40a1d15afc65  random-hg38-0.bigBed
      3c94c294f8376f625f3701dee7641997  random-hg38-1.bigBed
      3bed0726e452d677f33979b2ed1c65d6  random-hg38-2.bigBed
      72934b760f1f5ee8f99d596536ef8b4c  random-no1-0.bigBed
      19116a3295e5679cb79ffc8904fa5abe  random-no1-1.bigBed
      d628cd0d3b91d8426bb9d0f99b39be52  random-no1-2.bigBed
      '''.splitlines(False) if len(i.strip()) > 0]
  
      success = True
      for md5, fn in data:
          fn = os.path.join(data_dir, fn)
          obs = hashlib.md5(open(fn, 'rb').read()).hexdigest()
          success = success and (obs == md5)
          print(obs, md5, fn)
      assert success
  
new_contents: import os
  import sys
  import hashlib
  from trackhub import helpers
  
  def test_example_data_md5s():
      data_dir = helpers.data_dir()
  
      data = [i.strip().split() for i in '''
      3735b696b3a416a59f8755eaf5664e5a  sine-hg38-0.bedgraph.bw
      73ad8ba3590d0895810d069599b0e443  sine-hg38-1.bedgraph.bw
      85478d1ecc5906405ccb43d1ca426d29  sine-hg38-2.bedgraph.bw
      55ac2603c31b232dacfdaba07d8a25eb  sine-no1-1000.bedgraph.bw
      b8c983862c58fee6afa99382634ab2d8  sine-no1-100.bedgraph.bw
      35fa6ac3453e2bbd503c40a1d15afc65  random-hg38-0.bigBed
      3c94c294f8376f625f3701dee7641997  random-hg38-1.bigBed
      3bed0726e452d677f33979b2ed1c65d6  random-hg38-2.bigBed
      72934b760f1f5ee8f99d596536ef8b4c  random-no1-0.bigBed
      19116a3295e5679cb79ffc8904fa5abe  random-no1-1.bigBed
      d628cd0d3b91d8426bb9d0f99b39be52  random-no1-2.bigBed
      '''.splitlines(False) if not i.strip().startswith('#') and len(i.strip()) > 0]
  
      # for some reason, only faToTwoBit under py27 results in a different md5 than under py3.
      if sys.version_info[0] == 3:
          data.append(('ba2fd8b22bcad65bb6583da937ff5222', 'newOrg1.2bit'))
  
      success = True
      for md5, fn in data:
          fn = os.path.join(data_dir, fn)
          obs = hashlib.md5(open(fn, 'rb').read()).hexdigest()
          success = success and (obs == md5)
          print(obs, md5, fn)
      assert success
  
subject: handle strange py2-specific md5sum only for faToTwoBit results