added tests

tests/test_scenarios.py

@@ -0,0 +1,53 @@
+"""Contract tests — scenario management."""
+
+import pytest
+
+from tests.base import ContractHelpers as H
+from tests.endpoints import Endpoints as E
+
+
+class TestListScenarios:
+    @pytest.mark.asyncio
+    async def test_returns_list(self, client):
+        res = await client.get(E.SCENARIOS)
+        H.assert_status(res, 200)
+        H.assert_is_list(res.json(), min_length=4)
+
+    @pytest.mark.asyncio
+    async def test_each_has_metadata(self, client):
+        data = (await client.get(E.SCENARIOS)).json()
+        for s in data:
+            H.assert_has_fields(s, "scenario_id", "name", "description", "hubs", "flight_count")
+
+    @pytest.mark.asyncio
+    async def test_known_scenarios_present(self, client):
+        ids = [s["scenario_id"] for s in (await client.get(E.SCENARIOS)).json()]
+        assert "normal_ops" in ids
+        assert "weather_disruption_ord" in ids
+        assert "maintenance_delay_sfo" in ids
+        assert "crew_swap_ewr" in ids
+
+
+class TestActiveScenario:
+    @pytest.mark.asyncio
+    async def test_get_active(self, client):
+        res = await client.get(E.SCENARIO_ACTIVE)
+        H.assert_status(res, 200)
+        H.assert_has_fields(res.json(), "scenario_id", "name")
+
+    @pytest.mark.asyncio
+    async def test_switch_scenario(self, client):
+        res = await client.put(E.SCENARIO_ACTIVE, json={"scenario_id": "normal_ops"})
+        H.assert_status(res, 200)
+        assert res.json()["scenario_id"] == "normal_ops"
+
+        res = await client.get(E.SCENARIO_ACTIVE)
+        assert res.json()["scenario_id"] == "normal_ops"
+
+        await client.put(E.SCENARIO_ACTIVE, json={"scenario_id": "weather_disruption_ord"})
+
+    @pytest.mark.asyncio
+    async def test_switch_invalid(self, client):
+        res = await client.put(E.SCENARIO_ACTIVE, json={"scenario_id": "nonexistent"})
+        H.assert_status(res, 200)
+        assert "error" in res.json()