spec: Add POM for logout page and auth_spec.rb

closes: USERS-198

See Jira for details.

Change-Id: If49e59ffc04a00dbea1d00f613322626f6b0ef4b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/220943
Tested-by: Jenkins
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Robert Lamb <rlamb@instructure.com>
QA-Review: Steve Shepherd <sshepherd@instructure.com>
Product-Review: Steve Shepherd <sshepherd@instructure.com>

spec/selenium/authorization/auth_spec.rb

@@ -15,18 +15,20 @@
 # You should have received a copy of the GNU Affero General Public License along
 # with this program. If not, see <http://www.gnu.org/licenses/>.
 
-require_relative 'common'
+require_relative '../common'
+require_relative './pages/logout_page'
 
 describe "auth" do
   include_context "in-process server selenium tests"
+  include LogoutPage
 
   describe "logout" do
     it "should present confirmation on GET /logout" do
       user_with_pseudonym active_user: true
       login_as
 
-      get "/logout"
-      f('#Button--logout-confirm').click
+      visit_logout_page
+      confirm_logout
 
       keep_trying_until {
         expect(driver.current_url).to match %r{/login/canvas}

spec/selenium/authorization/pages/logout_page.rb

@@ -0,0 +1,40 @@
+#
+# Copyright (C) 2017 - present Instructure, Inc.
+#
+# This file is part of Canvas.
+#
+# Canvas is free software: you can redistribute it and/or modify it under
+# the terms of the GNU Affero General Public License as published by the Free
+# Software Foundation, version 3 of the License.
+#
+# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+# details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with this program. If not, see <http://www.gnu.org/licenses/>.
+
+require_relative '../../common'
+
+
+module LogoutPage
+  #------------------------- Selectors --------------------------
+  def logout_confirm_btn_selector
+    '#Button--logout-confirm'
+  end
+
+  #------------------------- Elements ---------------------------
+  def logout_confirm_btn
+    f(logout_confirm_btn_selector)
+  end
+
+  #----------------------- Actions/Methods ----------------------
+  def visit_logout_page
+    get "/logout"
+  end
+
+  def confirm_logout
+    logout_confirm_btn.click
+  end
+end