diff --git a/redfish/managers/test_certificate.robot b/redfish/managers/test_certificate.robot
index 7be20c4..b332816 100644
--- a/redfish/managers/test_certificate.robot
+++ b/redfish/managers/test_certificate.robot
@@ -161,8 +161,11 @@
     ${certificate_dict}=  Create Dictionary  @odata.id=${certificate_uri}
     ${payload}=  Create Dictionary  CertificateString=${file_data}
     ...  CertificateType=PEM  CertificateUri=${certificate_dict}
+
+    ${expected_resp}=  Set Variable If  '${expected_status}' == 'ok'  ${HTTP_OK}
+    ...  '${expected_status}' == 'error'  ${HTTP_INTERNAL_SERVER_ERROR}
     ${resp}=  redfish.Post  /redfish/v1/CertificateService/Actions/CertificateService.ReplaceCertificate
-    ...  body=${payload}
+    ...  body=${payload}  valid_status_codes=[${expected_resp}]
 
     ${cert_file_content}=  OperatingSystem.Get File  ${cert_file_path}
     ${bmc_cert_content}=  redfish_utils.Get Attribute  ${certificate_uri}  CertificateString