Добавлена валидация цены

tests/domain/test_payment_price_validation.py

@@ -0,0 +1,62 @@
+from decimal import Decimal
+
+from app.domain.price import (
+    calculate_expected_payment_amount_kopecks,
+    is_init_payment_price_valid,
+)
+from app.schemas.response import DeliveryPrice
+
+
+def _make_price(**overrides: object) -> DeliveryPrice:
+    payload = {
+        "provider": "cdek",
+        "service_name": "CDEK tariff",
+        "price": Decimal("1250.00"),
+        "currency": "RUB",
+        "delivery_days_min": 1,
+        "delivery_days_max": 2,
+    }
+    payload.update(overrides)
+    return DeliveryPrice.model_construct(**payload)
+
+
+def test_init_payment_price_validation_accepts_exact_match() -> None:
+    provider_price = _make_price(price=Decimal("1250.00"))
+
+    assert is_init_payment_price_valid(125000, provider_price)
+    assert calculate_expected_payment_amount_kopecks(provider_price) == 125000
+
+
+def test_init_payment_price_validation_rejects_mismatch() -> None:
+    provider_price = _make_price(price=Decimal("1250.00"))
+
+    assert not is_init_payment_price_valid(124999, provider_price)
+
+
+def test_init_payment_price_validation_applies_multiplier_and_rounds_half_up() -> None:
+    provider_price = _make_price(price=Decimal("100.50"))
+
+    expected_amount = calculate_expected_payment_amount_kopecks(
+        provider_price,
+        price_multiplier=Decimal("1.1"),
+    )
+
+    assert expected_amount == 11100
+    assert is_init_payment_price_valid(
+        11100,
+        provider_price,
+        price_multiplier=Decimal("1.1"),
+    )
+
+
+def test_init_payment_price_validation_converts_rub_to_kopecks() -> None:
+    provider_price = _make_price(price=Decimal("899.00"))
+
+    assert calculate_expected_payment_amount_kopecks(provider_price) == 89900
+
+
+def test_init_payment_price_validation_rejects_non_rub_currency() -> None:
+    provider_price = _make_price(price=Decimal("899.00"), currency="USD")
+
+    assert calculate_expected_payment_amount_kopecks(provider_price) is None
+    assert not is_init_payment_price_valid(89900, provider_price)