redfish add account Service method test

Changes:
    - Added the test case
      Verify AccountService Unsupported Methods

Tested:
    - Ran and Tested on BMC Environment

Change-Id: I6c5b3c4f4d995a73fdbbd925ee07127e690e56af
Signed-off-by: Ian Lai <IanLai@ami.com>
diff --git a/redfish/account_service/test_user_account.robot b/redfish/account_service/test_user_account.robot
index 15463db..96bda5d 100644
--- a/redfish/account_service/test_user_account.robot
+++ b/redfish/account_service/test_user_account.robot
@@ -563,6 +563,22 @@
     AdminUser1       Administrator       AdminUser1
     ReadOnlyUser1    ReadOnly            ReadOnlyUser1
 
+Verify AccountService Unsupported Methods
+    [Documentation]  Verify Unsupported methods of AccountService
+    [Tags]  Verify_AccountService_Unsupported_Methods
+
+    # Put operation on Account Services
+    Redfish.Put  /redfish/v1/AccountService
+    ...    valid_status_codes=[${HTTP_METHOD_NOT_ALLOWED}]
+
+    # Post operation on Account Services
+    Redfish.Post  /redfish/v1/AccountService
+    ...  valid_status_codes=[${HTTP_METHOD_NOT_ALLOWED}]
+
+    # Delete operation on Account Services
+    Redfish.Delete  /redfish/v1/AccountService
+    ...  valid_status_codes=[${HTTP_METHOD_NOT_ALLOWED}]
+
 
 *** Keywords ***