Have the login example test also logout

Author: mdmintz

examples/test_login.py

@@ -12,3 +12,4 @@ def test_swag_labs_login(self):
         self.login_to_swag_labs()
         self.assert_element("div.inventory_list")
         self.assert_element('.inventory_item:contains("Sauce Labs Backpack")')
+        self.js_click("a#logout_sidebar_link")