Added test for overview menu

Changes:
    - Added suite to test overview page
    - Added test to verify existence of all sections of overview page

Change-Id: Ifb9b45cc213a22fcf74f125119630305f1aceae5
Signed-off-by: Rahul Maheshwari <rahulmaheshwari@in.ibm.com>
diff --git a/gui/data/resource_variables.py b/gui/data/resource_variables.py
index c4e4c52..b31fa9c 100644
--- a/gui/data/resource_variables.py
+++ b/gui/data/resource_variables.py
@@ -125,6 +125,9 @@
     xpath_login_button = "//button[@type='submit']"
     xpath_logout_button = "//button[@id='app-header-logout']"
 
+    # xpath for overview menu
+    xpath_overview_menu = "//a[@href='#/']"
+
     # xpath for control menu
     xpath_control_menu = "//button[@aria-controls='control-menu']"
     xpath_manage_power_usage_sub_menu = "//a[@href='#/control/manage-power-usage']"