Use Xvfb for testing

Jenkinsfile

@@ -29,11 +29,12 @@ pipeline {
                 }
             }
         }
-        wrap([$class: 'Xvfb']) {
         stage("Test") {
             steps {
+                wrap([$class: 'Xvfb']) {
                     sh "mvn test"
                 }
+            }
             post {
                 success {
                     echo "Generating Test Report..."
@@ -46,7 +47,6 @@ pipeline {
                 }
             }
         }
-        }
         stage("Deploy To OSSRH") {
             when {
                 branch 'release'