Unclosed socket(s) when running Python-side tests under Windows.

[rodrigogiraoserrao]

When running the test suite with python -m unittest under Windows 10, I get several ResourceWarning complaining about unclosed sockets.

This is probably a bug.

> python -m unittest
C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=648, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 56987), raddr=('127.0.0.1', 56992)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=740, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 56993), raddr=('127.0.0.1', 56997)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=604, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 56998), raddr=('127.0.0.1', 57003)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=700, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 57004), raddr=('127.0.0.1', 57008)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\Array.py:293: DeprecationWarning: Using or importing the ABCs from 'collections' instead of from 'collections.abc' is deprecated since Python 3.3, and in 3.10 it will stop working
  if isinstance(obj, collections.Iterable) \
C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=740, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 57010), raddr=('127.0.0.1', 57014)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=732, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 57015), raddr=('127.0.0.1', 57019)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=732, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 57020), raddr=('127.0.0.1', 57024)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
...C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=732, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 57025), raddr=('127.0.0.1', 57029)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
.C:\Users\rodri\Documents\Dyalog\pynapl\pynapl\IPC.py:83: ResourceWarning: unclosed <socket.socket fd=660, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=('127.0.0.1', 57030), raddr=('127.0.0.1', 57034)>
  self.sockfile=self.sock=None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
...
----------------------------------------------------------------------
Ran 13 tests in 32.845s

OK