add remaining test cases for ordered stop resolvers

test/resolvers/OrderedStopResolverTests.test.ts

@@ -261,6 +261,7 @@ describe("OrderedStopResolvers", () => {
   });
 
   describe("stop", () => {
+    async function getResponseForStopQuery(stopId: string) {
       const query = `
       query GetNextStop($systemId: ID!, $routeId: ID!, $stopId: ID!) {
         system(id: $systemId) {
@@ -276,8 +277,32 @@ describe("OrderedStopResolvers", () => {
       }
       `;
 
+      return await testServer.executeOperation({
+        query,
+        variables: {
+          systemId: mockSystem.id,
+          routeId: mockRoute.id,
+          stopId,
+        }
+      }, {
+        contextValue: {
+          repository,
+        }
+      });
+    }
+
     it("returns the associated stop if it exists", async () => {
+      const orderedStops = await setUpOrderedStopsInRepository();
+      orderedStops[0].stopId = mockStops[0].id;
+      await repository.addOrUpdateOrderedStop(orderedStops[0]);
 
+      const response = await getResponseForStopQuery(orderedStops[0].stopId);
+
+      assert(response.body.kind === "single");
+      expect(response.body.singleResult.errors).toBeUndefined();
+      const stop = (response.body.singleResult.data?.system as any).route.orderedStop.stop;
+      expect(stop.name).toEqual(mockStops[0].name);
+      expect(stop.id).toEqual(mockStops[0].id);
     });
   });
 });