Added unit test cases

Author: snithyanantham

.eslintrc.json

@@ -0,0 +1,17 @@
+{
+    "env": {
+        "commonjs": true,
+        "es6": true,
+        "node": true
+    },
+    "extends": "eslint:recommended",
+    "globals": {
+        "Atomics": "readonly",
+        "SharedArrayBuffer": "readonly"
+    },
+    "parserOptions": {
+        "ecmaVersion": 2018
+    },
+    "rules": {
+    }
+}

README.md

@@ -21,7 +21,7 @@ jobs:
           email: ${{ secrets.HEROKU_EMAIL }} # your heroku email
           api_key: ${{ secrets.HEROKU_API_KEY }} # your  heroku api key
           docker_compose_file: './src/docker-compose.heroku.yml' # set the path to the folder where the docker-compose file is located
-          heroku_apps: '[{"imagename":"App1","appname":"App1","apptype":"web"},{"imagename":"App2","appname":"App2","apptype":"web"},{"imagename":"App3","appname":"App2","apptype":"worker"}]' # List of Docker Image name, Heroku app and Heroku app type
+          heroku_apps: '[{"imagename":"app1","appname":"app1","apptype":"web"},{"imagename":"app2","appname":"app2","apptype":"web"},{"imagename":"app3","appname":"app2","apptype":"worker"}]' # List of Docker Image name, Heroku app and Heroku app type
 ```
 
 | Variables  | Required           |

app.js

@@ -0,0 +1,86 @@
+const core = require('@actions/core');
+const { promisify } = require('util');
+
+const exec = promisify(require('child_process').exec);
+
+const asyncForEach = async (array, callback) => {
+    for (let index = 0; index < array.length; index++) {
+        await callback(array[index], index, array)
+    }
+}
+
+let loginToHeroku = async function loginToHeroku(login, password) {
+    try {
+
+        await exec(`cat >~/.netrc <<EOF
+        machine api.heroku.com
+            login ${login}
+            password ${password}
+        EOF`);
+
+        console.log('.netrc file create ✅');
+
+        await exec(`echo ${password} | docker login --username=${login} registry.heroku.com --password-stdin`);
+
+        console.log('Logged in succefully ✅');
+    }
+    catch (error) {
+        core.setFailed(`Authentication process faild. Error: ${error.message}`);
+    }
+}
+
+let getImageAppNameList = async function getImageAppNameList(heroku_apps) {
+    try {
+        return JSON.parse(heroku_apps);
+    }
+    catch (error) {
+        core.setFailed(`Invalid input for heroku app. Error: ${error.message}`);
+    }
+}
+
+let buildDockerCompose = async function buildDockerCompose(dockerComposeFilePath) {
+    try {
+        console.log('docker image build started.');
+        await exec(`docker-compose -f ${dockerComposeFilePath} build`);
+        console.log('docker image build finished.');
+    }
+    catch (error) {
+        core.setFailed(`Somthing went wrong building your image. Error: ${error.message}`);
+    }
+}
+
+let pushAndDeployAllImages = async function pushAndDeployAllImages(imageList) {
+    try {
+        if (imageList.length > 0) {
+            await asyncForEach(imageList, async (item) => {
+                console.log('Processing image -' + item.imagename);
+                await exec(`docker tag ${item.imagename} registry.heroku.com/${item.appname}/${item.apptype}`);
+                console.log('Container tagged for image - ' + item.imagename);
+                await exec(`docker push registry.heroku.com/${item.appname}/web`);
+                console.log('Container pushed for image - ' + item.imagename);
+                await exec(`heroku container:release ${item.apptype} --app ${item.appname}`);
+                console.log('Container deployed for image - ' + item.imagename);
+            });
+            console.log('App Deployed successfully ✅');
+        } else {
+            core.setFailed(`No image given to process.`);
+        }
+    }
+    catch (error) {
+        core.setFailed(`Somthing went wrong while pushing and deploying your image. Error: ${error.message}`);
+    }
+}
+
+let buildAndDeploy = async function buildAndDeploy(login, password, dockerComposeFilePath, imageListString)
+{
+        await loginToHeroku(login, password);
+        await buildDockerCompose(dockerComposeFilePath);
+        const imageList = await getImageAppNameList(imageListString);
+        await pushAndDeployAllImages(imageList);
+}
+
+module.exports.loginToHeroku = loginToHeroku;
+module.exports.getImageAppNameList = getImageAppNameList;
+module.exports.buildDockerCompose = buildDockerCompose;
+module.exports.pushAndDeployAllImages = pushAndDeployAllImages;
+module.exports.buildAndDeploy = buildAndDeploy;