Fix bug in lettuce tests where the unregister dialog wasn't

getting closed fast enough.

common/djangoapps/terrain/steps.py

@@ -144,3 +144,8 @@ def i_am_an_edx_user(step):
 @step(u'User "([^"]*)" is an edX user$')
 def registered_edx_user(step, uname):
     world.create_user(uname)
+
+
+@step(u'All dialogs should be closed$')
+def dialogs_are_closed(step):
+    assert world.dialogs_closed()

common/djangoapps/terrain/ui_helpers.py

 #pylint: disable=C0111
 #pylint: disable=W0621
 
-from lettuce import world, step
+from lettuce import world
 import time
 from urllib import quote_plus
 from selenium.common.exceptions import WebDriverException
@@ -105,10 +105,21 @@ def css_visible(css_selector):
 
 
 @world.absorb
+def dialogs_closed():
+    def are_dialogs_closed(driver):
+        '''
+        Return True when no modal dialogs are visible
+        '''
+        return not css_visible('.modal')
+    wait_for(are_dialogs_closed)
+    return not css_visible('.modal')
+
+
+@world.absorb
 def save_the_html(path='/tmp'):
     u = world.browser.url
     html = world.browser.html.encode('ascii', 'ignore')
     filename = '%s.html' % quote_plus(u)
     f = open('%s/%s' % (path, filename), 'w')
     f.write(html)
-    f.close
+    f.close()

lms/djangoapps/courseware/features/registration.feature

@@ -15,4 +15,6 @@ Feature: Register for a course
     And I visit the dashboard
     When I click the link with the text "Unregister"
     And I press the "Unregister" button in the Unenroll dialog
-    Then I should see "Looks like you haven't registered for any courses yet." somewhere in the page
+    Then All dialogs should be closed
+    And I should be on the dashboard page
+    And I should see "Looks like you haven't registered for any courses yet." somewhere in the page