add tests for postComment

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

.babelrc

@@ -1,4 +1,9 @@
 {
+    "env": {
+        "test": {
+            "plugins": [ "istanbul" ]
+        }
+    },
     "presets": [
         ["@babel/env", { "targets": {"node": "current"} }]
     ],

package.json

@@ -23,6 +23,7 @@
     "@babel/plugin-transform-async-to-generator": "^7.1.0",
     "@babel/preset-env": "^7.1.0",
     "babel-core": "^7.0.0-bridge.0",
+    "babel-plugin-istanbul": "^5.1.0",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "gulp": "^3.9.1",
@@ -32,19 +33,28 @@
     "gulp-print": "^5.0.0",
     "mocha": "^5.2.0",
     "nodemon": "^1.18.4",
+    "nyc": "^13.1.0",
     "sinon": "^7.1.1",
+    "sinon-chai": "^3.3.0",
     "supertest": "^3.3.0"
   },
   "scripts": {
     "start": "node server.js",
     "test": "mocha --require @babel/register",
     "testw": "mocha --require @babel/register --watch",
+    "cover": "nyc mocha",
     "devel": "gulp devel",
     "clean": "gulp clean",
     "build": "gulp build",
     "image": "docker build -t statusteam/ghcmgr .",
     "push": "docker push statusteam/ghcmgr"
   },
+  "mocha": [
+    "@babel/register"
+  ],
+  "require": [
+    "@babel/register"
+  ],
   "keywords": [
     "github",
     "comments",

test/comments.js

@@ -1,6 +1,5 @@
 import { expect } from 'chai'
 import sinon from 'sinon'
-import Octokit from '@octokit/rest'
 
 import Builds from '../src/builds'
 import Comments from '../src/comments'
@@ -42,7 +41,12 @@ const COMMENT = `
 
 describe('Comments', () => {
   beforeEach(() => {
-    //client = sinon.createStubInstance(Octokit, {what: 2})
+    client = {
+      issues: {
+        createComment: sinon.stub().returns({ data: { id: 'ISSUE-ID' }}),
+        updateComment: sinon.stub().returns({ data: { id: 'ISSUE-ID' }}),
+      },
+    }
     builds = sinon.createStubInstance(Builds, {
       getBuilds: BUILDS,
     })
@@ -64,4 +68,17 @@ describe('Comments', () => {
       expect(body).to.eq(COMMENT)
     })
   })
+
+  describe('postComment', () => {
+    it('should create a new comment', async () => {
+      let id = await comments.postComment('PR')
+      expect(id).to.eq('ISSUE-ID')
+      expect(client.issues.createComment).calledOnceWith({
+        body: sinon.match.any,
+        number: 'PR',
+        owner: 'owner',
+        repo: 'repo',
+      })
+    })
+  })
 })

test/setup.js

@@ -0,0 +1,4 @@
+import chai from 'chai'
+import sinonChai from 'sinon-chai'
+
+chai.use(sinonChai)