new_contents: from __future__ import with_statement
  
  import unittest
  
  import hgvs.exceptions
  import hgvs.intervalmapper
  
  class Test_IntervalMapper(unittest.TestCase):
      longMessage = True
  
      def setUp(self):
          pass
  
      def test_intervalmapper_valid(self):
          interval = hgvs.intervalmapper.Interval(3, 4)
          st = str(interval)
          self.assertEqual(1, interval.len)
          self.assertEqual(interval.__repr__(), 'Interval(start_i=3,end_i=4)')
  
      def test_intervalmapper_invalid_start_gt_end(self):
          with self.assertRaises(hgvs.exceptions.InvalidIntervalError):
              interval = hgvs.intervalmapper.Interval(4,3)
  
      def test_intervalpair_valid_match(self):
          iv1 = hgvs.intervalmapper.Interval(3, 4)
          iv2 = hgvs.intervalmapper.Interval(6, 7)
          intervalpair = hgvs.intervalmapper.IntervalPair(iv1, iv2)
          self.assertEqual(intervalpair.__repr__(),
                           'IntervalPair(ref=Interval(start_i=3,end_i=4),tgt=Interval(start_i=6,end_i=7))')
  
      def test_intervalpair_valid_insertion(self):
          iv1 = hgvs.intervalmapper.Interval(3, 3)
          iv2 = hgvs.intervalmapper.Interval(6, 7)
          intervalpair = hgvs.intervalmapper.IntervalPair(iv1, iv2)
          self.assertEqual(intervalpair.__repr__(),
                           'IntervalPair(ref=Interval(start_i=3,end_i=3),tgt=Interval(start_i=6,end_i=7))')
  
      def test_intervalpair_valid_deletion(self):
          iv1 = hgvs.intervalmapper.Interval(3, 4)
          iv2 = hgvs.intervalmapper.Interval(6, 6)
          intervalpair = hgvs.intervalmapper.IntervalPair(iv1, iv2)
          self.assertEqual(intervalpair.__repr__(),
                           'IntervalPair(ref=Interval(start_i=3,end_i=4),tgt=Interval(start_i=6,end_i=6))')
  
      def test_intervalpair_invalid(self):
          iv1 = hgvs.intervalmapper.Interval(3, 4)
          iv2 = hgvs.intervalmapper.Interval(6, 9)
          with self.assertRaises(hgvs.exceptions.InvalidIntervalError):
              intervalpair = hgvs.intervalmapper.IntervalPair(iv1, iv2)
  
  
  if __name__ == '__main__':
      unittest.main()
  
  ## <LICENSE>
  ## Copyright 2014 HGVS Contributors (https://bitbucket.org/invitae/hgvs)
  ## 
  ## 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.
  ## </LICENSE>
  
subject: Add some basic intervalmapper tests based on the coverage results