adds a test for ie alert, faking browser and button click

spec/features/home_spec.rb

@@ -19,4 +19,31 @@ feature "Home" do
     end
   end
 
+  feature 'IE alert' do
+    scenario 'IE visitors are presented with an alert until they close it', :js do
+      page.driver.headers = { "User-Agent" => "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0)" }
+
+      visit root_path
+      expect(page).to have_xpath(ie_alert_box_xpath, visible: false)
+      expect(page.driver.cookies['ie_alert_closed']).to be_nil
+
+      # faking close button, since a normal find and click
+      # will not work as the element is inside a HTML conditional comment
+      page.driver.set_cookie 'ie_alert_closed', 'true'
+
+      visit root_path
+      expect(page).not_to have_xpath(ie_alert_box_xpath, visible: false)
+      expect(page.driver.cookies["ie_alert_closed"].value).to eq('true')
+    end
+
+    scenario 'non-IE visitors are not bothered with IE alerts', :js do
+      visit root_path
+      expect(page).not_to have_xpath(ie_alert_box_xpath, visible: false)
+      expect(page.driver.cookies['ie_alert_closed']).to be_nil
+    end
+
+    def ie_alert_box_xpath
+      "/html/body/div[@class='wrapper']/comment()[contains(.,'ie-alert-box')]"
+    end
+  end
 end