test: add test for safe_value_nested

tests/test_misc.py

@@ -19,6 +19,7 @@ from freqtrade.misc import (
     plural,
     safe_value_fallback,
     safe_value_fallback2,
+    safe_value_nested,
 )
 
 
@@ -93,6 +94,13 @@ def test_pair_to_filename(pair, expected_result):
     assert pair_s == expected_result
 
 
+def test_safe_value_nested():
+    dict1 = {"first": {"rows": {"pass": "dog", "number": "1"}}}
+    assert safe_value_nested(dict1, "first.rows.pass") == "dog"
+    assert safe_value_nested(dict1, "first.rows.fail", default_value="cat") == "cat"
+    assert safe_value_nested(dict1, "first") == dict1["first"]
+
+
 def test_safe_value_fallback():
     dict1 = {"keya": None, "keyb": 2, "keyc": 5, "keyd": None}
     assert safe_value_fallback(dict1, "keya", "keyb") == 2