[DOCUMENTATION] added docstrings for new CommandExecutionError (- WIP #157 -)

### ChangeLog:

Changes in file tests/exceptions.py:
 Unknown Changes

Author: reactive-firewall

tests/exceptions.py

@@ -3,6 +3,52 @@
 __module__ = "tests.exceptions"
 
 class CommandExecutionError(RuntimeError):
+	"""
+	Exception raised when a command execution fails.
+
+	Attributes:
+		message (str) -- Description of the error.
+		exit_code (int) -- The exit code associated with the error.
+
+	Meta-Testing:
+
+		Testcase 1: Initialization with message and exit code.
+			A. - Initializes the error.
+			B. - checks inheritance.
+			C. - checks each attribute.
+
+			>>> error = CommandExecutionError("Failed to execute command", exit_code=1)
+			>>> isinstance(error, RuntimeError)
+			True
+			>>> error.message
+			'Failed to execute command'
+			>>> error.exit_code
+			1
+	"""
+
 	def __init__(self, message, exit_code, *args, **kwargs):
+		"""
+		Initialize CommandExecutionError with a message and exit code.
+
+		Parameters:
+			message (str) -- Description of the error.
+			exit_code (int) -- The exit code associated with the error.
+			*args: Variable length argument list.
+			**kwargs: Arbitrary keyword arguments.
+
+		Meta-Testing:
+
+			Testcase 1: Initialization with different exit code:
+				 A. - Initializes a CommandExecutionError with a specific exit code.
+				 B. - Checks the message is still set, as super class would.
+				 C. - check the specific exit code is 2.
+
+				>>> error = CommandExecutionError("Error message", 2)
+				>>> error.message
+				'Error message'
+				>>> error.exit_code
+				2
+		"""
 		super().__init__(message, *args, **kwargs)
-		self.exit_code = exit_code
+		self.exit_code = exit_code
+