new_contents: import unittest
  from ..tracks import *
  
  
  class TracksTests(unittest.TestCase):
      def setUp(self):
          trk_array = [
              Track(direction='Y', x_low=1, x_high=1, y_low=1, y_high=5),
              Track(direction='X', x_low=1, x_high=3, y_low=1, y_high=1),
              Track(direction='Y', x_low=3, x_high=3, y_low=1, y_high=4),
          ]
          cnx_array = [(0, 1), (1, 2)]
          self.trks = Tracks(trk_array, cnx_array)
  
      def test_verify_tracks(self):
          self.trks.verify_tracks()
  
      def test_verify_tracks_not_connected(self):
          self.trks.tracks.append(
              Track(direction='X', x_low=1, x_high=3, y_low=4, y_high=4)
          )
  
          with self.assertRaises(AssertionError):
              self.trks.verify_tracks()
  
      def test_verify_tracks_directon_error(self):
          self.trks.tracks.append(
              Track(direction='Y', x_low=1, x_high=1, y_low=5, y_high=6)
          )
          self.trks.track_connections.append((0, 3))
  
          with self.assertRaises(AssertionError):
              self.trks.verify_tracks()
  
      def test_adjacent_simple(self):
  
          self.assertEqual(
              self.trks.is_wire_adjacent_to_track(0, (1, 1)), Direction.RIGHT
          )
          self.assertEqual(
              self.trks.is_wire_adjacent_to_track(0, (2, 1)), Direction.LEFT
          )
          self.assertEqual(
              self.trks.is_wire_adjacent_to_track(0, (5, 2)), Direction.NO_SIDE
          )
  
          self.assertEqual(
              self.trks.is_wire_adjacent_to_track(1, (2, 1)), Direction.TOP
          )
          self.assertEqual(
              self.trks.is_wire_adjacent_to_track(1, (2, 2)), Direction.BOTTOM
          )
          self.assertEqual(
              self.trks.is_wire_adjacent_to_track(1, (5, 2)), Direction.NO_SIDE
          )
  
      def test_adjacenet_assert(self):
          trk_array = [
              Track(direction='Y', x_low=1, x_high=1, y_low=1, y_high=5),
              Track(direction='X', x_low=1, x_high=3, y_low=1, y_high=1),
              Track(direction='foobar', x_low=3, x_high=3, y_low=1, y_high=4),
          ]
          cnx_array = [(0, 1), (1, 2)]
          trks = Tracks(trk_array, cnx_array)
          with self.assertRaises(AssertionError):
              trks.is_wire_adjacent_to_track(2, (3, 1))
  
      def test_get_tracks(self):
  
          dirs = [d for d in self.trks.get_tracks_for_wire_at_coord((1, 1))]
          self.assertEqual(
              sorted(dirs), [(0, Direction.RIGHT), (1, Direction.TOP)]
          )
  
subject: add tests for tracks.py