feature-[168359407]: get all categories

- add functionality to get all categories
[Delivers #168359407]

server/controllers/Categories.js

@@ -37,6 +37,24 @@ class Categories {
       serverError(res);
     }
   }
+
+  /**
+   * @name getAll
+   * @async
+   * @static
+   * @memberof Categories
+   * @param {Object} req express request object
+   * @param {Object} res express response object
+   * @returns {JSON} server response
+   */
+  static async getAll(req, res) {
+    try {
+      const allCategories = await Category.findAll();
+      return serverResponse(res, 200, { categories: allCategories });
+    } catch (error) {
+      serverError(res);
+    }
+  }
 }
 
 export default Categories;

server/routes/category.js

@@ -10,6 +10,8 @@ const {
   getSessionFromToken
 } = middlewares;
 
+route.get('/', Categories.getAll);
+
 route.post(
   '/create',
   verifyToken,

test/categories/getCategories.test.js

@@ -0,0 +1,33 @@
+import chai, { expect } from 'chai';
+import chaiHttp from 'chai-http';
+import sinon from 'sinon';
+import app from '../../server';
+import models from '../../server/database/models';
+
+const { BASE_URL } = process.env;
+const { Category } = models;
+
+chai.use(chaiHttp);
+
+describe('GET Categories Test', () => {
+  it('gets all categories', async () => {
+    const response = await chai.request(app).get(`${BASE_URL}/categories`);
+    expect(response).to.have.status(200);
+    expect(response.body.categories).to.be.an('array');
+  });
+
+  context('when there is an internal error', () => {
+    it('returns a 500 server error', async () => {
+      const stub = sinon.stub(Category, 'findAll');
+      const error = new Error('server error, this will be resolved shortly');
+      stub.yields(error);
+      const res = await chai.request(app).get(`${BASE_URL}/categories`);
+      expect(res).to.have.status(500);
+      expect(res.body).to.include.key('error');
+      expect(res.body.error).to.equal(
+        'server error, this will be resolved shortly'
+      );
+      Category.findAll.restore();
+    });
+  });
+});

test/categories/index.js

@@ -1,3 +1,4 @@
 import * as createCategory from './createCategory.test';
+import * as getCategories from './getCategories.test';
 
-export default createCategory;
+export { createCategory, getCategories };