Align test directory with working directory

tests/util/test_periodiccache.py

@@ -0,0 +1,32 @@
+import time_machine
+
+from freqtrade.util import PeriodicCache
+
+
+def test_ttl_cache():
+    with time_machine.travel("2021-09-01 05:00:00 +00:00", tick=False) as t:
+        cache = PeriodicCache(5, ttl=60)
+        cache1h = PeriodicCache(5, ttl=3600)
+
+        assert cache.timer() == 1630472400.0
+        cache["a"] = 1235
+        cache1h["a"] = 555123
+        assert "a" in cache
+        assert "a" in cache1h
+
+        t.move_to("2021-09-01 05:00:59 +00:00")
+        assert "a" in cache
+        assert "a" in cache1h
+
+        # Cache expired
+        t.move_to("2021-09-01 05:01:00 +00:00")
+        assert "a" not in cache
+        assert "a" in cache1h
+
+        t.move_to("2021-09-01 05:59:59 +00:00")
+        assert "a" not in cache
+        assert "a" in cache1h
+
+        t.move_to("2021-09-01 06:00:00 +00:00")
+        assert "a" not in cache
+        assert "a" not in cache1h