How to test RobotFramework test library using mock objects

Question

I have created a RobotFramework test library in Python. It internally utilizes paramiko and paramiko-expect packages to connect to various *nix hosts and execute Unix commands.

I have been reading about Python's unittest.mock library but having issues in how to write sample mock tests to test my custom keyword functions using it. The idea is to run the tests quickly so that I don't have to wait for a long time for the tests to run between code changes.

For e.g., I have a base Command library in Command.py as follows,

from typing import List, Optional

class Command:
    ROBOT_LIBRARY_VERSION = '1.0'
    ROBOT_LIBRARY_SCOPE = 'GLOBAL'
    
    @staticmethod
    def run_command(
        command: str, timeout: int = 60, prompt: str = '.*[\$#>]\s+',
        present_patterns: Optional[List[str]] = None
    ):
        # Run the given command on host derived from a config file
        # Fail the keyword if any of the present patterns are not present in the command output

    @staticmethod
    def get_last_command_output() -> str:
        # return the last command output

I have specialized file operations library in FileOps.py,

from com.stackoverflow.Command import Command

class FileOps:
    ROBOT_LIBRARY_VERSION = '1.0'
    ROBOT_LIBRARY_SCOPE = 'GLOBAL'
    
    @staticmethod
    def get_latest_file(absolute_file_pattern: str) -> str:
        Command.run_command(command=f'ls -lrt {absolute_file_pattern}')
        output = Command.get_last_command_output()
        # now split output lines and process the output to get the latest file 
        # on the last line and return

Now if I want to test the get_latest_file() through mock objects, what will be the approach as it is internally using run_command and other calls too?

I am not sure whether I can do mock testing through the robot files.