display parking system in system resolver and remove unnecessary test

src/resolvers/SystemResolvers.ts

@@ -78,5 +78,18 @@ export const SystemResolvers: Resolvers<ServerContext> = {
 
       return await system.shuttleRepository.getShuttles();
     },
+    parkingSystem: async (parent, _args, contextValue, _info) => {
+      const system = contextValue.findSystemById(parent.id);
+      if (!system) {
+        return null;
+      }
+
+      const parkingRepository = system.parkingRepository;
+      if (!parkingRepository) return null;
+
+      return {
+        systemId: parent.id,
+      };
+    },
   },
 }

test/resolvers/ParkingSystemResolverTests.test.ts

@@ -68,18 +68,6 @@ describe("ParkingSystemResolver", () => {
       const parkingStructures = (response.body.singleResult.data as any).system.parkingSystem.parkingStructures;
       expect(parkingStructures).toHaveLength(0);
     });
-
-    it("returns a blank array if there is no parking data available", async () => {
-      context.systems[0].parkingTimedDataLoader = null;
-      context.systems[0].parkingRepository = null;
-
-      const response = await getResponseFromQueryNeedingSystemId(query);
-
-      assert(response.body.kind === "single");
-      expect(response.body.singleResult.errors).toBeUndefined();
-      const parkingStructures = (response.body.singleResult.data as any).system.parkingSystem.parkingStructures;
-      expect(parkingStructures).toHaveLength(0);
-    });
   });