Remove dead-code

Signed-off-by: Pierre Fersing <pierre.fersing@bleemeo.com>

Author: PierreF

Makefile

@@ -32,7 +32,6 @@ clean-test: ## remove test and coverage artifacts
 
 test :
 	$(PYTHON) -m pytest .
-	$(MAKE) -C test test
 
 upload : test
 	$(PYTHON) -m hatch build

tests/paho_test.py

@@ -20,11 +20,6 @@
 vg_logfiles = []
 
 
-class TestError(Exception):
-    def __init__(self, message="Mismatched packets"):
-        self.message = message
-
-
 def bind_to_any_free_port(sock) -> int:
     """
     Bind a socket to an available port on localhost,