test: cover unified media inspection route

tests/test_media_inspect_contract.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+from fastapi.testclient import TestClient
+
+from main import create_app
+
+
+def test_media_inspect_route_uses_standard_input_validation(settings) -> None:
+    with TestClient(create_app(settings)) as client:
+        response = client.post("/v1/media/inspect", json={})
+
+    assert response.status_code == 422
+    payload = response.json()
+    assert payload["success"] is False
+    assert payload["error"]["code"] == "INVALID_INPUT"
+    assert "No media input found" in payload["error"]["message"]