Added a test to verify SSH login failure with incorrect service user password

Added testcase:
    - Verify SSH Login Failure With Incorrect Service User Password

Change-Id: Ib7302e9c661b59ef57940c64a19cb5965e505bb6
Signed-off-by: manashsarma <manashsarma@in.ibm.com>
diff --git a/openpower/service_account/test_service_login.robot b/openpower/service_account/test_service_login.robot
index 744332b..92cddb2 100644
--- a/openpower/service_account/test_service_login.robot
+++ b/openpower/service_account/test_service_login.robot
@@ -76,6 +76,18 @@
     Should Be Equal  ${status}  ${True}
 
 
+Verify SSH Login Failure With Incorrect Service User Password
+    [Documentation]  Verify SSH login failure with incorrect service user password.
+    [Tags]  Verify_SSH_Login_Failure_With_Incorrect_Service_User_Password
+    [Setup]  Remove Existing ACF  AND  Upload Valid ACF
+
+    # Attempt SSH login with service user.
+    SSHLibrary.Open Connection  ${OPENBMC_HOST}
+    # Attempt login with invalid password
+    ${status}=   Run Keyword And Return Status  SSHLibrary.Login  service  ${SERVICE_USER_PASSWORD}123
+    Should Be Equal  ${status}  ${False}
+
+
 *** Keywords ***
 
 Suite Setup Execution