add jest for running tests

Signed-off-by: Jakub Sokołowski <jakub@status.im>

gulpfile.js

@@ -6,7 +6,7 @@ const nodemon = require('gulp-nodemon')
 
 gulp.task('devel', () => {
   nodemon({
-      script: 'src/app.js',
+      script: 'src/server.js',
       presets: ['env', 'stage-2'],
       exec: 'babel-node'
     })

package.json

@@ -17,21 +17,57 @@
     "@babel/node": "^7.0.0",
     "@babel/plugin-transform-async-to-generator": "^7.1.0",
     "@babel/preset-env": "^7.1.0",
+    "babel-core": "^7.0.0-bridge.0",
     "gulp": "^3.9.1",
     "gulp-babel": "^8.0.0-beta.2",
     "gulp-clean": "^0.4.0",
     "gulp-nodemon": "^2.2.1",
     "gulp-print": "^5.0.0",
-    "nodemon": "^1.18.4"
+    "jest": "^23.6.0",
+    "nodemon": "^1.18.4",
+    "supertest": "^3.3.0"
   },
   "scripts": {
-    "start": "node app.js",
+    "start": "node server.js",
+    "test": "jest",
+    "testw": "jest --watchAll",
     "devel": "gulp devel",
     "clean": "gulp clean",
     "build": "gulp build",
     "image": "docker build -t statusteam/clicks-counter .",
     "push": "docker push statusteam/clicks-counter"
   },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json"
+    ],
+    "collectCoverage": true,
+    "collectCoverageFrom": [
+      "src/**/*.js",
+      "!**/node_modules/**",
+      "!**/build/**",
+      "!**/coverage/**"
+    ],
+    "coverageThreshold": {
+      "global": {
+        "branches": 100,
+        "functions": 100,
+        "lines": 100,
+        "statements": 100
+      }
+    },
+    "coverageReporters": [
+      "text",
+      "text-summary"
+    ],
+    "testRegex": "/test/.*.js$",
+    "testPathIgnorePatterns": [
+      "/node_modules/",
+      "/build/",
+      "/coverage/"
+    ]
+  },
   "keywords": [],
   "author": "",
   "license": "ISC"

src/app.js

@@ -9,7 +9,6 @@ import Redis from 'async-redis'
 /* DEFAULTS */
 const REDIS_HOST = process.env.REDIS_HOST || 'localhost'
 const REDIS_PORT = process.env.REDIS_PORT || 6379
-const LISTEN_PORT = process.env.LISTEN_PORT || 3000
 
 const app = new Koa()
 const router = new Router()
@@ -23,6 +22,7 @@ app.on('error', (err, ctx) => {
 router.put('/clicks/:id', async ctx => {
   counter.incr(ctx.params.id)
   ctx.body = { [ctx.params.id]: await counter.state(ctx.params.id) }
+  ctx.status = 201
 });
 
 router.get('/clicks', async ctx => {
@@ -38,6 +38,4 @@ app.use(Logger())
    .use(router.routes())
    .use(router.allowedMethods())
 
-app.listen(LISTEN_PORT)
-console.log(`Redis connection: ${REDIS_HOST}:${REDIS_PORT}`)
-console.log(`Started at: http://localhost:${LISTEN_PORT}/`)
+module.exports = app

src/server.js

@@ -0,0 +1,10 @@
+import app from './app'
+
+/* DEFAULTS */
+const REDIS_HOST = process.env.REDIS_HOST || 'localhost'
+const REDIS_PORT = process.env.REDIS_PORT || 6379
+const LISTEN_PORT = process.env.LISTEN_PORT || 3000
+
+app.listen(LISTEN_PORT)
+console.log(`Redis connection: ${REDIS_HOST}:${REDIS_PORT}`)
+console.log(`Started at: http://localhost:${LISTEN_PORT}/`)

test/app.js

@@ -0,0 +1,12 @@
+import request from 'supertest'
+import app from '../src/app'
+
+test('incrementing clicks works', async () => {
+    let resp = await request(app.callback()).put('/clicks/id')
+    expect(resp.status).toBe(201)
+})
+
+test('clicks works', async () => {
+    let resp = await request(app.callback()).get('/clicks')
+    expect(resp.status).toBe(200)
+})