Look into `PytestUnraisableExceptionWarning` during tests about localtileserver

[banesullivan]

What test is causing this issue?
What code in that test is problematic?

The issue was the test_create_tile_client_bad test where I catch specific errors when creating a TileServerThread instance. The __init__ of TileServerThread performed a fe value checks before initializing the actual Thread:

localtileserver/localtileserver/server.py

Lines 82 to 91 in f2c9c60

	if not isinstance(port, int):
	raise ValueError(f"Port must be an int, not {type(port)}")
	if processes > 1 and not hasattr(os, "fork"):
	logger.error("Your platform does not support forking. Failing to multithreading.")
	processes = 1
	threaded = True
	if threaded and processes > 1:
	threaded = False
	threading.Thread.__init__(self)

On errors, the initialization would never happen on garbage collection the __del__ operator override would be called, calling:

localtileserver/localtileserver/server.py

Line 121 in f2c9c60

if self.is_alive():

Which is what caused the error.

Is this serious?

Not at all

Can this be resolved?

Done. See associated commit