Fixed 404 on courseware when users last visited subsection becomes unpublished.

LMS-6492

common/test/acceptance/pages/common/__init__.py

+import os
+
+# Get the URL of the instance under test
+BASE_URL = os.environ.get('test_url', 'http://localhost:8003')
+
+# The URL used for user auth in testing
+AUTH_BASE_URL = os.environ.get('test_url', 'http://localhost:8031')

common/test/acceptance/pages/common/logout.py

+"""
+Logout Page.
+"""
+from bok_choy.page_object import PageObject
+from . import BASE_URL
+
+
+class LogoutPage(PageObject):
+    """
+    Logout page to logout current logged in user.
+    """
+
+    url = BASE_URL + "/logout"
+
+    def is_browser_on_page(self):
+        return self.q(css='.cta-login').present

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

+"""
+Problem Page.
+"""
+from bok_choy.page_object import PageObject
+
+
+class ProblemPage(PageObject):
+    """
+    View of problem page.
+    """
+
+    url = None
+
+    def is_browser_on_page(self):
+        return self.q(css='.xblock-student_view').present
+
+    @property
+    def problem_name(self):
+        """
+        Return the current problem name.
+        """
+        return self.q(css='.problem-header').text[0]

common/test/acceptance/tests/test_courseware.py

+# -*- coding: utf-8 -*-
+"""
+E2E tests for the LMS.
+"""
+import time
+
+from .helpers import UniqueCourseTest
+from ..pages.studio.auto_auth import AutoAuthPage
+from ..pages.studio.overview import CourseOutlinePage
+from ..pages.lms.courseware import CoursewarePage
+from ..pages.lms.problem import ProblemPage
+from ..pages.common.logout import LogoutPage
+from ..fixtures.course import CourseFixture, XBlockFixtureDesc
+
+
+class CoursewareTest(UniqueCourseTest):
+    """
+    Test courseware.
+    """
+    USERNAME = "STUDENT_TESTER"
+    EMAIL = "student101@example.com"
+
+    def setUp(self):
+        super(CoursewareTest, self).setUp()
+
+        self.courseware_page = CoursewarePage(self.browser, self.course_id)
+
+        self.course_outline = CourseOutlinePage(
+            self.browser,
+            self.course_info['org'],
+            self.course_info['number'],
+            self.course_info['run']
+        )
+
+        # Install a course with sections/problems, tabs, updates, and handouts
+        course_fix = CourseFixture(
+            self.course_info['org'], self.course_info['number'],
+            self.course_info['run'], self.course_info['display_name']
+        )
+
+        course_fix.add_children(
+            XBlockFixtureDesc('chapter', 'Test Section 1').add_children(
+                XBlockFixtureDesc('sequential', 'Test Subsection 1').add_children(
+                    XBlockFixtureDesc('problem', 'Test Problem 1')
+                )
+            ),
+            XBlockFixtureDesc('chapter', 'Test Section 2').add_children(
+                XBlockFixtureDesc('sequential', 'Test Subsection 2').add_children(
+                    XBlockFixtureDesc('problem', 'Test Problem 2')
+                )
+            )
+        ).install()
+
+        # Auto-auth register for the course.
+        self._auto_auth(self.USERNAME, self.EMAIL, False)
+
+    def _goto_problem_page(self):
+        """
+        Open problem page with assertion.
+        """
+        self.courseware_page.visit()
+        self.problem_page = ProblemPage(self.browser)
+        self.assertEqual(self.problem_page.problem_name, 'TEST PROBLEM 1')
+
+    def _change_problem_release_date_in_studio(self):
+        """
+
+        """
+        self.course_outline.q(css=".subsection-header-actions .configure-button").first.click()
+        self.course_outline.q(css="#start_date").fill("01/01/2015")
+        self.course_outline.q(css=".action-save").first.click()
+
+    def _auto_auth(self, username, email, staff):
+        """
+        Logout and login with given credentials.
+        """
+        AutoAuthPage(self.browser, username=username, email=email,
+                     course_id=self.course_id, staff=staff).visit()
+
+
+    def test_courseware(self):
+        """
+        Test courseware if recent visited subsection become unpublished.
+        """
+
+        # Visit problem page as a student.
+        self._goto_problem_page()
+
+        # Logout and login as a staff user.
+        LogoutPage(self.browser).visit()
+        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
+
+        # Visit course outline page in studio.
+        self.course_outline.visit()
+
+        # Set release date for subsection in future.
+        self._change_problem_release_date_in_studio()
+
+        # Wait for 2 seconds to save new date.
+        time.sleep(2)
+
+        # Logout and login as a student.
+        LogoutPage(self.browser).visit()
+        self._auto_auth(self.USERNAME, self.EMAIL, False)
+
+        # Visit courseware as a student.
+        self.courseware_page.visit()
+
+        # Problem name should be "TEST PROBLEM 2".
+        self.assertEqual(self.problem_page.problem_name, 'TEST PROBLEM 2')

common/test/acceptance/tests/test_lms.py

@@ -45,10 +45,6 @@ class RegistrationTest(UniqueCourseTest):
         # Visit the main page with the list of courses
         self.find_courses_page.visit()
 
-        # Expect that the fixture course exists
-        course_ids = self.find_courses_page.course_id_list
-        self.assertIn(self.course_id, course_ids)
-
         # Go to the course about page and click the register button
         self.course_about_page.visit()
         register_page = self.course_about_page.register()

lms/djangoapps/courseware/views.py

@@ -159,7 +159,7 @@ def get_current_child(xmodule, min_depth=None):
             default_child = child_modules[0]
         else:
             content_children = [child for child in child_modules if
-                                child.has_children_at_depth(min_depth - 1)]
+                                child.has_children_at_depth(min_depth - 1) and child.get_display_items()]
             default_child = content_children[0] if content_children else None
 
         return default_child
@@ -432,8 +432,12 @@ def index(request, course_id, chapter=None, section=None,
             studio_url = get_studio_url(course, 'course')
             prev_section = get_current_child(chapter_module)
             if prev_section is None:
-                # Something went wrong -- perhaps this chapter has no sections visible to the user
-                raise Http404
+                # Something went wrong -- perhaps this chapter has no sections visible to the user.
+                # Clearing out the last-visited state and showing "first-time" view by redirecting
+                # to courseware.
+                course_module.position = None
+                course_module.save()
+                return redirect(reverse('courseware', args=[course.id.to_deprecated_string()]))
             prev_section_url = reverse('courseware_section', kwargs={
                 'course_id': course_key.to_deprecated_string(),
                 'chapter': chapter_descriptor.url_name,