Add tests

Author: Roshan Jossy

api/merge.js

@@ -3,13 +3,13 @@ const request = require('request')
 exports.handleSubmit = (req, res) => {
   const pullRequest = req.body.pull_request
   if (shouldHandlePullRequestChange(req)) {
-    const result = handlePuRequest(pullRequest)
+    const result = handlePullRequest(pullRequest)
     res.json({ message: result })
   }
   res.json({ message: "Can't handle this pull request" })
 }
 
-const handlePuRequest = (pullRequest) => {
+const handlePullRequest = (pullRequest) => {
   request(pullRequest.diff_url, (error, response, body) => {
     logStatusAndErrors(error, response)
     if (isChangeInContributorsFile(body)) {
@@ -46,8 +46,8 @@ const isChangeInContributorsFile = diff =>
   (diff.match(/Contributors\.md/g) || []).length === 4
 
 const isSingleLineChange = pullRequest =>
-  (pullRequest.additions === 1 || pullRequest.additions === 2 &&
-  pullRequest.additions - pullRequest.deletions === 1 ) &&
+  (pullRequest.additions === 1 || pullRequest.additions === 2) &&
+  pullRequest.additions - pullRequest.deletions === 1  &&
   pullRequest.changed_files === 1
 
 const getPostRequestOptions = (user, url) => ({
@@ -74,3 +74,10 @@ const logStatusAndErrors = (error, response) => {
   console.error('statusCode:', response && response.statusCode) // Print the response status code if a response was received
 }
 
+module.exports = {
+  shouldHandlePullRequestChange,
+  isChangeInContributorsFile,
+  isSingleLineChange,
+  getPostRequestOptions,
+  getMergeMessage
+}

package.json

@@ -4,11 +4,13 @@
   "scripts": {
     "build": "rollup -c",
     "dev": "rollup -c -w",
-    "start": "sirv public"
+    "start": "sirv public",
+    "test": "jest"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^11.0.0",
     "@rollup/plugin-node-resolve": "^6.0.0",
+    "jest": "^26.0.1",
     "rollup": "^1.20.0",
     "rollup-plugin-livereload": "^1.0.0",
     "rollup-plugin-svelte": "^5.0.3",