Version control and retrieval endpoints

tests/topicController.test.ts

@@ -1,6 +1,7 @@
 import { Request, Response } from 'express';
-import { getTopics } from '../src/controllers/topicController';
+import { getTopics, getTopicByIdRecursive } from '../src/controllers/topicController';
 import { topics } from '../src/models/topic';
+import { topicMocks, treeMock } from './mocks'
 
 describe('Topic Controller', () => {
   it('should return an empty array when no topics exist', () => {
@@ -19,4 +20,21 @@ describe('Topic Controller', () => {
     // Expect that res.json was called with an empty array
     expect(res.json).toHaveBeenCalledWith([]);
   });
+
+  it('should return a recursive tree of a topic and its children', () => {
+    // Create mock objects for Request, Response, and NextFunction
+    const req = {} as Request;
+    const res = {
+      json: topicMocks
+    } as unknown as Response;
+
+    // Load mock values into in-memory store
+    topicMocks.forEach(t => topics.push(t))
+
+    // Retrieve recursive tree
+    req.params = { id: topicMocks[1].id.toString() }
+    getTopicByIdRecursive(req, res, jest.fn())
+
+    expect(res.json).toMatchObject(treeMock)
+  })
 });