Add new scenarios for font changes

There is currently some duplication between the various page objects
and other code. Those should be cleaned up incrementally.

Change-Id: I592829a00ca65bbecd5399b773c885c764c1cc06

tests/browser/features/step_definitions/common_steps.rb

@@ -5,3 +5,31 @@ end
 Given(/^I am logged in$/) do
   visit(LoginPage).login_with(@mediawiki_username, @mediawiki_password)
 end
+
+def language_to_code(language)
+	case language
+	when 'German'
+		'de'
+	when 'English'
+		'en'
+	else
+		pending
+	end
+end
+
+def get_font(selector)
+	@browser.execute_script( "return $( '#{selector}' ).css( 'font-family' );" )
+end
+
+def get_content_font()
+	get_font('#mw-content-text')
+end
+
+def get_interface_font()
+	get_font('body')
+end
+
+After('@reset-preferences-after') do |scenario|
+	visit(ResetPreferencesPage)
+	on(ResetPreferencesPage).submit_element.click
+end