feat: add FtTTLCache to avoid mocking issues

overrides timer in a central location.

freqtrade/util/__init__.py

@@ -22,6 +22,7 @@ from freqtrade.util.formatters import (
     round_value,
 )
 from freqtrade.util.ft_precise import FtPrecise
+from freqtrade.util.ft_ttlcache import FtTTLCache
 from freqtrade.util.measure_time import MeasureTime
 from freqtrade.util.periodic_cache import PeriodicCache
 from freqtrade.util.progress_tracker import (  # noqa F401
@@ -59,4 +60,5 @@ __all__ = [
     "print_rich_table",
     "print_df_rich_table",
     "CustomProgress",
+    "FtTTLCache",
 ]

freqtrade/util/ft_ttlcache.py

@@ -0,0 +1,12 @@
+import time
+
+from cachetools import TTLCache
+
+
+class FtTTLCache(TTLCache):
+    """
+    A TTLCache with a different default timer to allow for easier mocking in tests.
+    """
+
+    def __init__(self, maxsize, ttl, timer=time.time, getsizeof=None):
+        super().__init__(maxsize=maxsize, ttl=ttl, timer=timer, getsizeof=getsizeof)