[STYLE] Refactored to avoid PYL-C0201 (- WIP #233 -)

Changes in file tests/__init__.py:
 * avoid conditional with check of `keys()` to correct PYL-C0201

Author: reactive-firewall

tests/__init__.py

@@ -102,7 +102,7 @@ def emit(self, record):
 				# Validate the log level
 				if not isinstance(loglevel, str):
 					raise ValueError("Invalid log level")
-				if loglevel not in logging_color.keys():
+				if loglevel not in logging_color:
 					raise ValueError("Invalid log level")
 				# Determine color based on whether the output is a terminal
 				if sys.stdout.isatty():