text: #!/usr/bin/env python3
  # Copyright (c) 2017 The Bitcoin Core developers
  # Copyright (c) 2020 The PIVX developers
  # Copyright (c) 2020 The MiracleCoin developers
  # Distributed under the MIT software license, see the accompanying
  # file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  """Test debug logging."""
  
  import os
  
  from test_framework.test_framework import MiracleCoinTestFramework
  
  class LoggingTest(MiracleCoinTestFramework):
      def set_test_params(self):
          self.num_nodes = 1
          self.setup_clean_chain = True
  
      def run_test(self):
          # test default log file name
          assert os.path.isfile(os.path.join(self.nodes[0].datadir, "regtest", "debug.log"))
          self.log.info("Default filename ok")
  
          # test alternative log file name in datadir
          self.restart_node(0, ["-debuglogfile=foo.log"])
          assert os.path.isfile(os.path.join(self.nodes[0].datadir, "regtest", "foo.log"))
          self.log.info("Alternative filename ok")
  
          # test alternative log file name outside datadir
          tempname = os.path.join(self.options.tmpdir, "foo.log")
          self.restart_node(0, ["-debuglogfile=%s" % tempname])
          assert os.path.isfile(tempname)
          self.log.info("Alternative filename outside datadir ok")
  
          # check that invalid log (relative) will cause error
          invdir = os.path.join(self.nodes[0].datadir, "regtest", "foo")
          invalidname = os.path.join("foo", "foo.log")
          self.stop_node(0)
          self.assert_start_raises_init_error(0, ["-debuglogfile=%s" % (invalidname)],
                                                  "Error: Could not open debug log file")
          assert not os.path.isfile(os.path.join(invdir, "foo.log"))
          self.log.info("Invalid relative filename throws")
  
          # check that a previously invalid log (relative) works after path exists
          os.mkdir(invdir)
          self.start_node(0, ["-debuglogfile=%s" % (invalidname)])
          assert os.path.isfile(os.path.join(invdir, "foo.log"))
          self.log.info("Relative filename ok when path exists")
  
          # check that invalid log (absolute) will cause error
          self.stop_node(0)
          invdir = os.path.join(self.options.tmpdir, "foo")
          invalidname = os.path.join(invdir, "foo.log")
          self.assert_start_raises_init_error(0, ["-debuglogfile=%s" % invalidname],
                                                 "Error: Could not open debug log file")
          assert not os.path.isfile(os.path.join(invdir, "foo.log"))
          self.log.info("Invalid absolute filename throws")
  
          # check that a previously invalid log (relative) works after path exists
          os.mkdir(invdir)
          self.start_node(0, ["-debuglogfile=%s" % (invalidname)])
          assert os.path.isfile(os.path.join(invdir, "foo.log"))
          self.log.info("Absolute filename ok when path exists")
  
  
  if __name__ == '__main__':
      LoggingTest().main()