Dogtailify step.

This step was broken due to Tor Browser 6.0.x changing the zoom-levels
(or similar) so various elements of the just removed image were not
positioned the way we expected them.

features/step_definitions/browser.rb

@@ -228,3 +228,14 @@ end
 Then /^Tails homepage loads in the Unsafe Browser$/ do
   @screen.wait('TailsHomepage.png', 60)
 end
+
+Then /^the Tor Browser shows the "([^"]+)" error$/ do |error|
+  firefox = Dogtail::Application.new('Firefox')
+  page = firefox.child("Problem loading page", roleName: "document frame")
+  # Important to wait here since children() won't retry but return the
+  # immediate results
+  page.wait
+  headers = page.children(roleName: "heading")
+  found = headers.any? { |heading| heading.text == error }
+  raise "Could not find the '#{error}' error in the Tor Browser" unless found
+end

features/torified_browsing.feature

@@ -13,7 +13,7 @@ Feature: Browsing the web using the Tor Browser
     When I start the Tor Browser
     And the Tor Browser has started and loaded the startup page
     And I open a page on the LAN web server in the Tor Browser
-    Then I see "TorBrowserUnableToConnect.png" after at most 20 seconds
+    Then the Tor Browser shows the "Unable to connect" error
     And no traffic was sent to the web server on the LAN
 
   @check_tor_leaks