Added tests for SOL sub menu

Changes:
    - Added suite to test SOL page
    - Added tests to verify existence of all sections
      and buttons of SOL  page

Change-Id: Ie2f398522b1f4f575b0c87c476add4073bf42a68
Signed-off-by: Sushma M M <sushmm99@in.ibm.com>
diff --git a/gui/data/resource_variables.py b/gui/data/resource_variables.py
index bb42573..f5d1dfe 100644
--- a/gui/data/resource_variables.py
+++ b/gui/data/resource_variables.py
@@ -139,6 +139,7 @@
     xpath_reboot_bmc_sub_menu = "//a[@href='#/control/reboot-bmc']"
     xpath_server_led_sub_menu = "//a[@href='#/control/server-led']"
     xpath_server_power_operations_sub_menu = "//a[@href='#/control/server-power-operations']"
+    xpath_sol_sub_menu = "//a[@href='#/control/serial-over-lan']"
 
     # xpath for configuration menu
     xpath_server_configuration = "//button[@aria-controls='configuration-menu']"