the steps were missing

Jenkinsfile

@@ -28,11 +28,14 @@ pipeline {
 					echo 'Things were different before...'
 				}
 			}
+
 		}
 
 		stage('archiving test results') {
+			steps {
 				junit: 'testresults.xml'
 			}
+		}
 
     }
 }