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fix(backtest): improve error message for dates outside fixture window

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- Add helpful message suggesting Databento/Yahoo Finance for dates outside fixture range
- Update test to expect BOUNDED policy for backtest UI
This commit is contained in:
Bu5hm4nn
2026-03-30 09:11:47 +02:00
parent 70b09cbf0b
commit eaaf78cd12
2 changed files with 4 additions and 3 deletions
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3
app/services/backtesting/fixture_source.py
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@@ -54,7 +54,8 @@ class SharedHistoricalFixtureSource:
if start_date < self.start_date or end_date > self.end_date: if start_date < self.start_date or end_date > self.end_date:
raise ValueError( raise ValueError(
f"{self.feature_label} deterministic fixture data only supports the seeded " f"{self.feature_label} deterministic fixture data only supports the seeded "
f"{self.start_date.isoformat()} through {self.end_date.isoformat()} window" f"{self.start_date.isoformat()} through {self.end_date.isoformat()} window. "
f"For dates outside this range, please use Databento or Yahoo Finance data source."
) )
return [point for point in self.history if start_date <= point.date <= end_date] return [point for point in self.history if start_date <= point.date <= end_date]

4
tests/test_backtesting_fixture_source.py
View File

@@ -54,14 +54,14 @@ def test_shared_fixture_source_bounded_window_allows_subranges_but_fails_closed_
source.load_daily_closes("GLD", date(2024, 1, 5), date(2024, 1, 3)) source.load_daily_closes("GLD", date(2024, 1, 5), date(2024, 1, 3))
def test_backtest_page_service_uses_shared_exact_fixture_source() -> None: def test_backtest_page_service_uses_shared_bounded_fixture_source() -> None:
service = BacktestPageService() service = BacktestPageService()
source = service.backtest_service.provider.source source = service.backtest_service.provider.source
assert isinstance(source, SharedHistoricalFixtureSource) assert isinstance(source, SharedHistoricalFixtureSource)
assert source.feature_label == "BT-001A" assert source.feature_label == "BT-001A"
assert source.window_policy is WindowPolicy.EXACT assert source.window_policy is WindowPolicy.BOUNDED
def test_event_comparison_page_service_uses_shared_bounded_fixture_source() -> None: def test_event_comparison_page_service_uses_shared_bounded_fixture_source() -> None: