text: import os
  import sys
  import unittest
  import subprocess
  
  class TestLightning(unittest.TestCase):
  
      @staticmethod
      def run_shell(args, timeout=30):
          process = subprocess.Popen(['electrum/tests/regtest/regtest.sh'] + args, stderr=subprocess.STDOUT, stdout=subprocess.PIPE)
          for line in iter(process.stdout.readline, b''):
              sys.stdout.write(line.decode(sys.stdout.encoding))
          process.wait(timeout=timeout)
          process.stdout.close()
          assert process.returncode == 0
  
      def setUp(self):
          test_name = self.id().split('.')[-1]
          sys.stdout.write("***** %s ******\n" % test_name)
          # initialize and get funds
          for agent in self.agents:
              self.run_shell(['init', agent])
          # mine a block so that funds are confirmed
          self.run_shell(['new_block'])
          # extra configuration (optional)
          self.run_shell(['configure_' + test_name])
          # start daemons
          for agent in self.agents:
              self.run_shell(['start', agent])
  
      def tearDown(self):
          for agent in self.agents:
              self.run_shell(['stop', agent])
  
  
  class TestLightningAB(TestLightning):
      agents = ['alice', 'bob']
  
      def test_breach(self):
          self.run_shell(['breach'])
  
      def test_extract_preimage(self):
          self.run_shell(['extract_preimage'])
  
      def test_redeem_htlcs(self):
          self.run_shell(['redeem_htlcs'])
  
      def test_breach_with_unspent_htlc(self):
          self.run_shell(['breach_with_unspent_htlc'])
  
      def test_breach_with_spent_htlc(self):
          self.run_shell(['breach_with_spent_htlc'])
  
  
  class TestLightningABC(TestLightning):
      agents = ['alice', 'bob', 'carol']
  
      def test_forwarding(self):
          self.run_shell(['forwarding'])
  
      def test_watchtower(self):
          self.run_shell(['watchtower'])
  