new_contents: import unittest
  from fasm2bels.verilog_modeling import Wire, Constant, Bus, NoConnect
  
  
  class TestVerilogModeling(unittest.TestCase):
      def test_connections(self):
          self.assertEqual("a", Wire("a").to_string())
          self.assertEqual("1'b0", Constant(0).to_string())
          self.assertEqual("1'b1", Constant(1).to_string())
          self.assertEqual(
              "{1'b0, 1'b1}",
              Bus([Constant(1), Constant(0)]).to_string()
          )
          self.assertEqual(
              "{a, 1'b1}",
              Bus([Constant(1), Wire('a')]).to_string()
          )
          self.assertEqual("", NoConnect().to_string())
  
      def test_rename(self):
          self.assertEqual("b", Wire("a").to_string({'a': 'b'}))
          self.assertEqual(
              "{b, 1'b1}",
              Bus([Constant(1), Wire('a')]).to_string({'a': 'b'})
          )
  
      def test_iter_connections(self):
          self.assertEqual(list(Wire('a').iter_wires()), [(None, "a")])
          self.assertEqual(
              list(Bus([Constant(1), Wire('a')]).iter_wires()), [(1, "a")]
          )
          self.assertEqual(
              list(Bus([Wire('b'), Wire('a')]).iter_wires()),
              [(0, "b"), (1, "a")]
          )
          self.assertEqual(list(Constant(0).iter_wires()), [])
          self.assertEqual(list(NoConnect().iter_wires()), [])
  
subject: Add test for new connection modelling objects.