Apply base promo discounts to all order components

tests/test_promo_group_base_discounts.py

@@ -0,0 +1,29 @@
+import pytest
+
+from app.config import settings
+from app.database.models import PromoGroup
+
+
+@pytest.fixture
+def base_discount_settings(monkeypatch):
+    monkeypatch.setattr(settings, "BASE_PROMO_GROUP_PERIOD_DISCOUNTS_ENABLED", True)
+    monkeypatch.setattr(settings, "BASE_PROMO_GROUP_PERIOD_DISCOUNTS", "60:15")
+    yield
+
+
+def test_base_promo_discount_applies_to_all_categories(base_discount_settings):
+    promo_group = PromoGroup(name="Default", is_default=True)
+
+    assert promo_group.get_discount_percent("period", 60) == 15
+    assert promo_group.get_discount_percent("servers", 60) == 15
+    assert promo_group.get_discount_percent("traffic", 60) == 15
+    assert promo_group.get_discount_percent("devices", 60) == 15
+
+
+def test_specific_category_discount_overrides_base(base_discount_settings):
+    promo_group = PromoGroup(
+        name="Default", is_default=True, server_discount_percent=5
+    )
+
+    assert promo_group.get_discount_percent("servers", 60) == 5
+    assert promo_group.get_discount_percent("devices", 60) == 15