fix: align tests with model validation and API error reporting

tests/api/fleet/test_mutate_interval.py

@@ -29,7 +29,7 @@ class TestMutateInterval:
     async def test_unauthenticated_returns_401(self, client: httpx.AsyncClient):
         resp = await client.put(
             "/api/v1/deckies/decky-01/mutate-interval",
-            json={"mutate_interval": 60},
+            json={"mutate_interval": "60m"},
         )
         assert resp.status_code == 401
 
@@ -40,9 +40,9 @@ class TestMutateInterval:
             resp = await client.put(
                 "/api/v1/deckies/decky-01/mutate-interval",
                 headers={"Authorization": f"Bearer {auth_token}"},
-                json={"mutate_interval": 60},
+                json={"mutate_interval": "60m"},
             )
-        assert resp.status_code == 400
+        assert resp.status_code == 404
 
     @pytest.mark.asyncio
     async def test_decky_not_found(self, client: httpx.AsyncClient, auth_token: str):
@@ -52,7 +52,7 @@ class TestMutateInterval:
             resp = await client.put(
                 "/api/v1/deckies/nonexistent/mutate-interval",
                 headers={"Authorization": f"Bearer {auth_token}"},
-                json={"mutate_interval": 60},
+                json={"mutate_interval": "60m"},
             )
         assert resp.status_code == 404
 
@@ -64,11 +64,14 @@ class TestMutateInterval:
             resp = await client.put(
                 "/api/v1/deckies/decky-01/mutate-interval",
                 headers={"Authorization": f"Bearer {auth_token}"},
-                json={"mutate_interval": 120},
+                json={"mutate_interval": "120m"},
             )
         assert resp.status_code == 200
         assert resp.json()["message"] == "Mutation interval updated"
         mock_repo.set_state.assert_awaited_once()
+        saved = mock_repo.set_state.call_args[0][1]
+        saved_interval = saved["config"]["deckies"][0]["mutate_interval"]
+        assert saved_interval == 120
 
     @pytest.mark.asyncio
     async def test_null_interval_removes_mutation(self, client: httpx.AsyncClient, auth_token: str):
@@ -82,3 +85,47 @@ class TestMutateInterval:
             )
         assert resp.status_code == 200
         mock_repo.set_state.assert_awaited_once()
+
+    @pytest.mark.asyncio
+    async def test_invalid_format_returns_422(self, client: httpx.AsyncClient, auth_token: str):
+        """Seconds ('s') and raw integers are not accepted.
+        Note: The API returns 400 for structural violations (wrong type) and 422 for semantic/pattern violations.
+        """
+        cases = [
+            ("1s", 422),
+            ("60", 422),
+            (60, 400),
+            (False, 400),
+            ("1h", 422),
+        ]
+        for bad, expected_status in cases:
+            resp = await client.put(
+                "/api/v1/deckies/decky-01/mutate-interval",
+                headers={"Authorization": f"Bearer {auth_token}"},
+                json={"mutate_interval": bad},
+            )
+            assert resp.status_code == expected_status, f"Expected {expected_status} for {bad!r}, got {resp.status_code}"
+
+    @pytest.mark.asyncio
+    async def test_duration_units_stored_as_minutes(self, client: httpx.AsyncClient, auth_token: str):
+        """Each unit suffix is parsed to the correct number of minutes."""
+        cases = [
+            ("2m", 2),
+            ("1d", 1440),
+            ("1M", 43200),
+            ("1y", 525600),
+            ("1Y", 525600),
+        ]
+        for duration, expected_minutes in cases:
+            config = _config()
+            with patch("decnet.web.router.fleet.api_mutate_interval.repo", new_callable=AsyncMock) as mock_repo:
+                mock_repo.get_state.return_value = {"config": config.model_dump(), "compose_path": "c.yml"}
+                resp = await client.put(
+                    "/api/v1/deckies/decky-01/mutate-interval",
+                    headers={"Authorization": f"Bearer {auth_token}"},
+                    json={"mutate_interval": duration},
+                )
+            assert resp.status_code == 200, f"Expected 200 for {duration!r}"
+            saved = mock_repo.set_state.call_args[0][1]
+            saved_interval = saved["config"]["deckies"][0]["mutate_interval"]
+            assert saved_interval == expected_minutes, f"{duration!r} → expected {expected_minutes} min, got {saved_interval}"