Made a css_html to obtain the html of the css element.

This works like css_click in that it will retry if there was a stale element reference exception

cms/djangoapps/contentstore/features/course-updates.py

@@ -60,8 +60,7 @@ def change_date(_step, new_date):
 @step(u'I should see the date "([^"]*)"$')
 def check_date(_step, date):
     date_css = 'span.date-display'
-    date_html = world.css_find(date_css)
-    assert date == date_html.html
+    assert date == world.css_html(date_css)
 
 
 @step(u'I modify the handout to "([^"]*)"$')
@@ -74,8 +73,7 @@ def edit_handouts(_step, text):
 @step(u'I see the handout "([^"]*)"$')
 def check_handout(_step, handout):
     handout_css = 'div.handouts-content'
-    handouts = world.css_find(handout_css)
-    assert handout in handouts.html
+    assert handout in world.css_html(handout_css)
 
 
 def change_text(text):

cms/djangoapps/contentstore/features/grading.py

@@ -47,7 +47,7 @@ def confirm_change(step):
     range_css = '.range'
     all_ranges = world.css_find(range_css)
     for i in range(len(all_ranges)):
-        assert all_ranges[i].html != '0-50'
+        assert world.css_html(range_css, index=i) != '0-50'
 
 
 @step(u'I change assignment type "([^"]*)" to "([^"]*)"$')

cms/djangoapps/contentstore/features/static-pages.py

@@ -54,6 +54,6 @@ def get_index(name):
     page_name_css = 'section[data-type="HTMLModule"]'
     all_pages = world.css_find(page_name_css)
     for i in range(len(all_pages)):
-        if all_pages[i].html == '\n    {name}\n'.format(name=name):
+        if world.css_html(page_name_css, index=i) == '\n    {name}\n'.format(name=name):
             return i
     return -1

cms/djangoapps/contentstore/features/upload.py

@@ -67,7 +67,7 @@ def no_duplicate(_step, file_name):
     all_names = world.css_find(names_css)
     only_one = False
     for i in range(len(all_names)):
-        if file_name == all_names[i].html:
+        if file_name == world.css_html(names_css, index=i):
             only_one = not only_one
     assert only_one
 
@@ -100,7 +100,7 @@ def get_index(file_name):
     names_css = 'td.name-col > a.filename'
     all_names = world.css_find(names_css)
     for i in range(len(all_names)):
-        if file_name == all_names[i].html:
+        if file_name == world.css_html(names_css, index=i):
             return i
     return -1
 

common/djangoapps/terrain/ui_helpers.py

@@ -168,6 +168,21 @@ def css_text(css_selector):
 
 
 @world.absorb
+def css_html(css_selector, index=0, max_attempts=5):
+    """
+    Returns the HTML of a css_selector and will retry if there is a StaleElementReferenceException
+    """
+    assert is_css_present(css_selector)
+    attempt = 0
+    while attempt < max_attempts:
+        try:
+            return world.browser.find_by_css(css_selector)[index].html
+        except:
+            attempt += 1
+    return ''
+
+
+@world.absorb
 def css_visible(css_selector):
     assert is_css_present(css_selector)
     return world.browser.find_by_css(css_selector).visible