Remove flaky decorator.

Test passed > 130 times. Perhaps
querying for the content changes timing.

common/test/acceptance/pages/lms/course_wiki.py

@@ -3,7 +3,7 @@ Wiki tab on courses
 """
 
 from common.test.acceptance.pages.lms.course_page import CoursePage
-from common.test.acceptance.pages.studio.utils import type_in_codemirror
+from common.test.acceptance.pages.studio.utils import type_in_codemirror, get_codemirror_value
 
 
 class CourseWikiPage(CoursePage):
@@ -91,6 +91,13 @@ class CourseWikiEditPage(CourseWikiSubviewPage):
         """
         type_in_codemirror(self, 0, content)
 
+    def get_wiki_editor_content(self):
+        """
+        Returns the content currently in the wiki editor.
+        """
+
+        return get_codemirror_value(self, 0)
+
     def save_wiki_content(self):
         """
         When the editor is open, click save

common/test/acceptance/tests/lms/test_lms.py

@@ -563,7 +563,6 @@ class CourseWikiTest(UniqueCourseTest):
         self.course_wiki_edit_page.wait_for_page()
 
     @attr(shard=1)
-    @skip  # EDUCATOR-511
     def test_edit_course_wiki(self):
         """
         Wiki page by default is editable for students.
@@ -576,6 +575,7 @@ class CourseWikiTest(UniqueCourseTest):
         content = "hello"
         self._open_editor()
         self.course_wiki_edit_page.replace_wiki_content(content)
+        self.assertEqual(content, self.course_wiki_edit_page.get_wiki_editor_content())
         self.course_wiki_edit_page.save_wiki_content()
         actual_content = unicode(self.course_wiki_page.q(css='.wiki-article p').text[0])
         self.assertEqual(content, actual_content)