Add test for parameter loading

freqtrade/optimize/hyperopt.py

@@ -12,7 +12,6 @@ from math import ceil
 from pathlib import Path
 from typing import Any, Dict, List, Optional
 
-import numpy as np
 import progressbar
 import rapidjson
 from colorama import Fore, Style

freqtrade/strategy/hyper.py

@@ -327,10 +327,10 @@ class HyperStrategyMixin(object):
             try:
                 params = json_load(filename.open('r'))
                 if params.get('strategy_name') != self.__class__.__name__:
-                    raise OperationalException('Invalid parameter file provided')
+                    raise OperationalException('Invalid parameter file provided.')
                 return params
             except ValueError:
-                logger.warning("Invalid parameter file.")
+                logger.warning("Invalid parameter file format.")
                 return {}
         logger.info("Found no parameter file.")