Fix lettuce css_fill method for devstack

common/djangoapps/terrain/ui_helpers.py

@@ -526,7 +526,23 @@ def css_fill(css_selector, text, index=0):
     Then for synchronization purposes, wait for the value on the page.
     """
     wait_for_visible(css_selector, index=index)
-    retry_on_exception(lambda: css_find(css_selector)[index].fill(text))
+
+    # HACK:
+    # At some point, in devstack strings were no longer being filled into fields
+    # correctly under our original implementation which used splinter's fill method.
+    # Instead everything after certain letters (E.g. e and r) was getting truncated.
+    #
+    # Note that troubleshooting showed that this happened both with the splinter "fill"
+    # method, and directly with its underlying selenium implementation which is
+    # self._element.clear() followed by self._element.send_keys(value)
+    #
+    # As a workaround, wait for the element to be visible, then use JS to set its value.
+    retry_on_exception(lambda: css_find(css_selector)[index] is not None)
+    world.browser.driver.execute_script('window.jQuery("{css_selector}").val("{text}");'.format(
+        css_selector=css_selector,
+        text=text
+        ))
+
     wait_for(lambda _: css_has_value(css_selector, text, index=index))
     return True