Added a Test stage

Jenkinsfile

@@ -12,6 +12,7 @@ if (env.TAG_NAME && env.TAG_NAME.contains("release")) {
 }
 
 podTemplate(label: label, cloud: "${kubeCloud}", containers: [
+  containerTemplate(name: 'ruby', image: "ruby:2.5.1", command: 'cat', ttyEnabled: true),
   containerTemplate(name: 'gcloud', image: "gcr.io/ci-cd-for-bn/gcloud-docker", command: 'cat', ttyEnabled: true),
   containerTemplate(name: 'kubectl', image: 'gcr.io/cloud-builders/kubectl', command: 'cat', ttyEnabled: true)
 ],
@@ -28,6 +29,12 @@ volumes: [
     def previousGitCommit = sh(script: "git rev-parse ${gitCommit}~", returnStdout: true)
     def imageTag = "gcr.io/${project}/${appName}:${gitBranch}.${env.BUILD_NUMBER}.${gitCommit}"
     
+    stage('Test') {
+      container('ruby') {
+        sh "bundle install && bundle exec rubocop && bundle exec rspec"
+      }
+    }
+   
     stage('Build and Publish') {
       container('gcloud') {
         withCredentials([file(credentialsId: 'cloud-datastore-user-account-creds', variable: 'FILE')]) {