add test for associated route

test/resolvers/OrderedStopResolverTests.test.ts

@@ -208,7 +208,10 @@ describe("OrderedStopResolvers", () => {
 
   describe("route", () => {
     // Note that there is no `orderedStop(forRouteId)` resolver,
-    // so fetch all ordered stops for a stop instead
+    // so fetch all ordered stops for a stop instead.
+    // If we went through the route ID, it would've
+    // relied on the parent data within the route.orderedStop resolver
+    async function getResponseForRouteQuery(stopId: string) {
       const query = `
       query GetNextStop($systemId: ID!, $stopId: ID!) {
         system(id: $systemId) {
@@ -223,16 +226,44 @@ describe("OrderedStopResolvers", () => {
         }
       }
       `;
+
+      return await testServer.executeOperation({
+        query,
+        variables: {
+          systemId: mockSystem.id,
+          stopId,
+        }
+      }, {
+        contextValue: {
+          repository,
+        }
       });
+    }
 
     it("returns the associated route if it exists", async () => {
+      const orderedStops = generateMockOrderedStops();
+      orderedStops[0].routeId = mockRoute.id;
+      orderedStops[0].stopId = mockStops[0].id;
 
+      // Add one stop only
+      await repository.addOrUpdateOrderedStop(orderedStops[0]);
+
+      const response = await getResponseForRouteQuery(orderedStops[1].stopId);
+
+      assert(response.body.kind === "single");
+      expect(response.body.singleResult.errors).toBeUndefined();
+      const route = (response.body.singleResult.data?.system as any).stop.orderedStops[0].route
+
+      expect(route.id).toEqual(mockRoute.id);
+      expect(route.name).toEqual(mockRoute.name);
     });
 
     it("returns null if the route doesn't exist", async () => {
 
     });
 
+  });
+
   describe("stop", () => {
     const query = `
     query GetNextStop($systemId: ID!, $routeId: ID!, $stopId: ID!) {