Add test for load_backtest_data

freqtrade/tests/data/test_btanalysis.py

@@ -0,0 +1,21 @@
+import pytest
+from pandas import DataFrame
+
+from freqtrade.data.btanalysis import BT_DATA_COLUMNS, load_backtest_data
+from freqtrade.data.history import make_testdata_path
+
+
+def test_load_backtest_data():
+
+    filename = make_testdata_path(None) / "backtest-result_test.json"
+    bt_data = load_backtest_data(filename)
+    assert isinstance(bt_data, DataFrame)
+    assert list(bt_data.columns) == BT_DATA_COLUMNS + ["profitabs"]
+    assert len(bt_data) == 179
+
+    # Test loading from string (must yield same result)
+    bt_data2 = load_backtest_data(str(filename))
+    assert bt_data.equals(bt_data2)
+
+    with pytest.raises(ValueError, match=r"File .* does not exist\."):
+        load_backtest_data(str("filename") + "nofile")