GUI: New testcase to verify Model and serial number in GUI header.

Changes :-
    -  New test : Verify_System_Serial_And_Model_Number_In_GUI_Header
Tested :-
    -  Successfully ran this from gui/gui_test/gui_header/test_gui_header.robot

Change-Id: I46baac4ae808090d6955441d0868320f388c442d
Signed-off-by: rramyasr-in <rramyasr@in.ibm.com>
diff --git a/gui/gui_test/gui_header/test_gui_header.robot b/gui/gui_test/gui_header/test_gui_header.robot
index bc1bfb6..d42d771 100644
--- a/gui/gui_test/gui_header/test_gui_header.robot
+++ b/gui/gui_test/gui_header/test_gui_header.robot
@@ -13,7 +13,6 @@
 
 ${xpath_header_text}       //*[contains(@class, "navbar-text")]
 
-
 *** Test Cases ***
 
 Verify GUI Header Text
@@ -50,3 +49,18 @@
     Click Element  ${xpath_logout_button}
     Wait Until Page Contains Element  ${xpath_login_button}  timeout=15s
     Wait Until Element Is Not Visible   ${xpath_page_loading_progress_bar}  timeout=30
+
+
+Verify System Serial And Model Number In GUI Header Page
+    [Documentation]  Verify system serial and model number in GUI header page.
+    [Tags]  Verify_System_Serial_And_Model_Number_In_GUI_Header_Page
+
+   # Model.
+   ${redfish_model_number}=  Redfish.Get Attribute  ${SYSTEM_BASE_URI}  Model
+   Element Should Be Visible  //*[@data-test-id='appHeader-container-overview']
+   ...  /following-sibling::*/*[text()='${redfish_model_number}']
+
+   # Serial Number.
+   ${redfish_serial_number}=  Redfish.Get Attribute  ${SYSTEM_BASE_URI}  SerialNumber
+   Element Should Be Visible  //*[@data-test-id='appHeader-container-overview']
+   ...  /following-sibling::*/*[text()='${redfish_serial_number}']