new_contents: """
  Basic functionality and regression tests for ACA hdr3 (diagnostic) telemetry.
  """
  
  import numpy as np
  
  from .. import aca_hdr3
  
  
  def test_MSIDset():
      """
      Read all available MSIDs into a single MSIDset.  Use the empirically determined
      lengths as regression tests.
      """
      msids = [hdr3['msid'] for hdr3 in aca_hdr3.HDR3_DEF.values() if 'value' in hdr3]
  
      # Read all MSIDs as a set
      dat = aca_hdr3.MSIDset(msids, '2010:001', '2010:003')
  
      val_lengths = np.array([len(dat[msid].vals) for msid in msids])
      time_lengths = np.array([len(dat[msid].times) for msid in msids])
      assert np.all(val_lengths == time_lengths)
      assert np.all(val_lengths == 44432)
  
      for msid in msids:
          dat[msid].filter_bad()
      val_lengths = np.array([len(dat[msid].vals) for msid in msids])
      time_lengths = np.array([len(dat[msid].times) for msid in msids])
      assert np.all(val_lengths == time_lengths)
      assert np.all(val_lengths == [40528, 44432, 44432, 10679, 44432, 10760, 10731, 44432,
                                    44432, 10679, 44432, 44432, 44432, 44432, 40991, 44432,
                                    40991, 44432, 44432, 40991, 10679])
  
subject: Add minimal regression tests of reading ACA hdr3 data