add test cases

test/resolvers/OrderedStopResolverTests.test.ts

@@ -1,4 +1,4 @@
-import { beforeEach, describe } from "@jest/globals";
+import { beforeEach, describe, it } from "@jest/globals";
 import { ApolloServer } from "@apollo/server";
 import { UnoptimizedInMemoryRepository } from "../../src/repositories/UnoptimizedInMemoryRepository";
 import { ServerContext } from "../../src/ServerContext";
@@ -28,6 +28,18 @@ describe("OrderedStopResolvers", () => {
       }
     }
     `;
+
+    it("returns the next stop if it exists", async () => {
+
+    });
+
+    it("returns null if there is no next stop in the repository", async () => {
+
+    });
+
+    it("returns null if the current stop no longer exists", async () => {
+
+    });
   });
 
   describe("previousStop", () => {
@@ -45,6 +57,18 @@ describe("OrderedStopResolvers", () => {
       }
     }
     `;
+
+    it("returns the previous stop if it exists", async () => {
+
+    });
+
+    it("returns null if there is no previous stop in the repository", async () => {
+
+    });
+
+    it("returns null if the current stop no longer exists", async () => {
+
+    });
   });
 
   describe("route", () => {
@@ -66,6 +90,14 @@ describe("OrderedStopResolvers", () => {
     `;
   });
 
+  it("returns the associated route if it exists", async () => {
+
+  });
+
+  it("returns null if the route doesn't exist", async () => {
+
+  });
+
   describe("stop", () => {
     const query = `
     query GetNextStop($systemId: ID!, $routeId: ID!, $stopId: ID!) {
@@ -81,6 +113,14 @@ describe("OrderedStopResolvers", () => {
       }
     }
     `;
+
+    it("returns the associated stop if it exists", async () => {
+
+    });
+
+    it("returns null if the stop doesn't exist", async () => {
+
+    });
   });
 });