Test autogetting result filename

freqtrade/data/btanalysis.py

@@ -59,7 +59,7 @@ def load_backtest_stats(filename: Union[Path, str]) -> Dict[str, Any]:
     if isinstance(filename, str):
         filename = Path(filename)
     if filename.is_dir():
-        filename = get_latest_backtest_filename(filename)
+        filename = filename / get_latest_backtest_filename(filename)
     if not filename.is_file():
         raise ValueError(f"File {filename} does not exist.")
     logger.info(f"Loading backtest result from {filename}")

tests/data/test_btanalysis.py

@@ -70,6 +70,10 @@ def test_load_backtest_data_new_format(testdatadir):
     bt_data2 = load_backtest_data(str(filename))
     assert bt_data.equals(bt_data2)
 
+    # Test loading from folder (must yield same result)
+    bt_data3 = load_backtest_data(testdatadir)
+    assert bt_data.equals(bt_data3)
+
     with pytest.raises(ValueError, match=r"File .* does not exist\."):
         load_backtest_data(str("filename") + "nofile")