build 039: complete Quotes Feed migration foundation

app/tests/unit/integrations/exchange/test_service_quote.py

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+# app/tests/unit/integrations/exchange/test_service_quote.py
+
+from __future__ import annotations
+
+from datetime import datetime, timedelta, timezone
+from decimal import Decimal
+from types import SimpleNamespace
+from typing import cast
+
+import pytest
+
+from src.core.config import Settings
+from src.integrations.exchange.exceptions import ExchangeError
+from src.integrations.exchange.market_cache import MarketPriceCache
+from src.integrations.exchange.service import ExchangeService
+from src.market_data.acquisition.models.quote import Quote
+from src.storage.quote_store import InMemoryQuoteStore
+
+
+def _service(*, exchange_enabled: bool = True) -> ExchangeService:
+    service = object.__new__(ExchangeService)
+    service.settings = cast(
+        Settings,
+        SimpleNamespace(
+            exchange_enabled=exchange_enabled,
+            default_symbol="BTC/USD_LEVERAGE",
+        ),
+    )
+    return service
+
+
+def _quote(*, age_seconds: float = 0.0) -> Quote:
+    return Quote(
+        symbol="BTC/USD_LEVERAGE",
+        last_price=Decimal("100"),
+        bid_price=Decimal("99"),
+        ask_price=Decimal("101"),
+        exchange_timestamp=None,
+        received_at=(
+            datetime.now(timezone.utc)
+            - timedelta(seconds=age_seconds)
+        ),
+        source="test",
+    )
+
+
+@pytest.fixture(autouse=True)
+def reset_store():
+    original = MarketPriceCache._store
+    MarketPriceCache._store = InMemoryQuoteStore()
+    yield
+    MarketPriceCache._store = original
+
+
+def test_get_quote_returns_fresh_cached_identity(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    service = _service()
+    quote = _quote()
+    MarketPriceCache.set_quote(quote, runtime_key="auto")
+    monkeypatch.setattr(
+        service,
+        "validate_symbol",
+        lambda _: SimpleNamespace(
+            is_valid=True,
+            normalized_symbol=quote.symbol,
+            message="",
+        ),
+    )
+    monkeypatch.setattr(
+        service,
+        "_get_fresh_quote",
+        lambda _: (_ for _ in ()).throw(AssertionError("REST not expected")),
+    )
+
+    assert service.get_quote(quote.symbol, runtime_key="auto") is quote
+
+
+def test_get_quote_refreshes_stale_quote(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    service = _service()
+    stale = _quote(age_seconds=10)
+    fresh = _quote()
+    MarketPriceCache.set_quote(stale, runtime_key="auto")
+    monkeypatch.setattr(
+        service,
+        "validate_symbol",
+        lambda _: SimpleNamespace(
+            is_valid=True,
+            normalized_symbol=fresh.symbol,
+            message="",
+        ),
+    )
+    monkeypatch.setattr(service, "_get_fresh_quote", lambda _: fresh)
+
+    result = service.get_quote(fresh.symbol, runtime_key="auto")
+
+    assert result is fresh
+    assert MarketPriceCache.get_quote(fresh.symbol, runtime_key="auto") is fresh
+
+
+def test_get_quote_wraps_acquisition_error(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    service = _service()
+    original = RuntimeError("unavailable")
+    monkeypatch.setattr(
+        service,
+        "_load_quote_via_acquisition",
+        lambda _: (_ for _ in ()).throw(original),
+    )
+    monkeypatch.setattr(service, "_log_exchange_error", lambda **_: None)
+
+    with pytest.raises(ExchangeError) as exc_info:
+        service._get_fresh_quote("BTC/USD_LEVERAGE")
+
+    assert exc_info.value.__cause__ is original