chore: add testing framework (jest) and start writing test for tracks logic

logic/tracks.test.js

@@ -0,0 +1,8 @@
+var {addPointsToTrack} = require('./tracks')
+
+describe('addPointsToTrack', () => {
+  it('is a function', () => {
+    expect(typeof addPointsToTrack).toBe('function')
+  })
+})
+

package.json

@@ -7,7 +7,8 @@
     "mongo:start": "docker run --name realworld-mongo -p 27017:27017 mongo & sleep 5",
     "start": "node ./app.js",
     "dev": "nodemon ./app.js",
-    "mongo:stop": "docker stop realworld-mongo && docker rm realworld-mongo"
+    "mongo:stop": "docker stop realworld-mongo && docker rm realworld-mongo",
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -22,6 +23,7 @@
     "express": "4.17.1",
     "express-jwt": "^6.0.0",
     "express-session": "1.17.1",
+    "jest": "^26.6.3",
     "joi": "^17.2.1",
     "jsonwebtoken": "8.5.1",
     "latest": "^0.2.0",
@@ -40,5 +42,8 @@
   "devDependencies": {
     "newman": "^5.2.0",
     "nodemon": "^2.0.4"
+  },
+  "jest": {
+    "modulePathIgnorePatterns": ["local"]
   }
 }