add ut

Jenkinsfile

@@ -47,6 +47,7 @@ pipeline {
         success {
             echo 'I succeeeded!'
             echo "email user: ${ghprbActualCommitAuthorEmail}"
+            currentBuild.result = 'SUCCESS'
             script{
                 try {
                     mail to: "${ghprbActualCommitAuthorEmail}",
@@ -57,7 +58,7 @@ pipeline {
                     echo 'email  err'
                 }
             }
-            echo currentBuild.result
+            echo 'SUCCESS'
 
         }