message: test: add node.chain_path and node.debug_log_path
  To allow easier access to the node's datadir and debug logs.
diff: @@ -20,6 +20,7 @@ import urllib.parse
  import collections
  import shlex
  import sys
  +from pathlib import Path
  from .authproxy import JSONRPCException
  from .descriptors import descsum_create
  @@ -383,13 +384,20 @@ class TestNode():
  def wait_until_stopped(self, timeout=BITCOIND_PROC_WAIT_TIMEOUT):
  wait_until_helper(self.is_node_stopped, timeout=timeout, timeout_factor=self.timeout_factor)
  + @property
  + def chain_path(self) -> Path:
  + return Path(self.datadir) / self.chain
  +
  + @property
  + def debug_log_path(self) -> Path:
  + return self.chain_path / 'debug.log'
  +
  @contextlib.contextmanager
  def assert_debug_log(self, expected_msgs, unexpected_msgs=None, timeout=2):
  if unexpected_msgs is None:
  unexpected_msgs = []
  time_end = time.time() + timeout * self.timeout_factor
  - debug_log = os.path.join(self.datadir, self.chain, 'debug.log')
  - with open(debug_log, encoding='utf-8') as dl:
  + with open(self.debug_log_path, encoding='utf-8') as dl:
  dl.seek(0, 2)
  prev_size = dl.tell()
  @@ -397,7 +405,7 @@ class TestNode():
  while True:
  found = True
  - with open(debug_log, encoding='utf-8') as dl:
  + with open(self.debug_log_path, encoding='utf-8') as dl:
  dl.seek(prev_size)
  log = dl.read()
  print_log = " - " + "\n - ".join(log.splitlines())
  