test_lms_courseware.py

# -*- coding: utf-8 -*-
"""
End-to-end tests for the LMS.
"""
from nose.plugins.attrib import attr

from ..helpers import UniqueCourseTest
from capa.tests.response_xml_factory import MultipleChoiceResponseXMLFactory
from ...pages.studio.auto_auth import AutoAuthPage
from ...pages.lms.create_mode import ModeCreationPage
from ...pages.studio.overview import CourseOutlinePage
from ...pages.lms.courseware import CoursewarePage, CoursewareSequentialTabPage
from ...pages.lms.course_nav import CourseNavPage
from ...pages.lms.problem import ProblemPage
from ...pages.common.logout import LogoutPage
from ...pages.lms.track_selection import TrackSelectionPage
from ...pages.lms.pay_and_verify import PaymentAndVerificationFlow, FakePaymentPage
from ...pages.lms.dashboard import DashboardPage
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_nav = CourseNavPage(self.browser)

        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
        self.course_fix = CourseFixture(
            self.course_info['org'], self.course_info['number'],
            self.course_info['run'], self.course_info['display_name']
        )

        self.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 _create_breadcrumb(self, index):
        """ Create breadcrumb """
        return ['Test Section {}'.format(index), 'Test Subsection {}'.format(index), 'Test Problem {}'.format(index)]

    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.course_outline.change_problem_release_date_in_studio()

        # 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')

    def test_course_tree_breadcrumb(self):
        """
        Scenario: Correct course tree breadcrumb is shown.

        Given that I am a registered user
        And I visit my courseware page
        Then I should see correct course tree breadcrumb
        """
        self.courseware_page.visit()

        xblocks = self.course_fix.get_nested_xblocks(category="problem")
        for index in range(1, len(xblocks) + 1):
            self.course_nav.go_to_section('Test Section {}'.format(index), 'Test Subsection {}'.format(index))
            courseware_page_breadcrumb = self.courseware_page.breadcrumb
            expected_breadcrumb = self._create_breadcrumb(index)  # pylint: disable=no-member
            self.assertEqual(courseware_page_breadcrumb, expected_breadcrumb)


class ProctoredExamTest(UniqueCourseTest):
    """
    Test courseware.
    """
    USERNAME = "STUDENT_TESTER"
    EMAIL = "student101@example.com"

    def setUp(self):
        super(ProctoredExamTest, 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_advanced_settings({
            "enable_proctored_exams": {"value": "true"}
        })

        course_fix.add_children(
            XBlockFixtureDesc('chapter', 'Test Section 1').add_children(
                XBlockFixtureDesc('sequential', 'Test Subsection 1').add_children(
                    XBlockFixtureDesc('problem', 'Test Problem 1')
                )
            )
        ).install()

        self.track_selection_page = TrackSelectionPage(self.browser, self.course_id)
        self.payment_and_verification_flow = PaymentAndVerificationFlow(self.browser, self.course_id)
        self.immediate_verification_page = PaymentAndVerificationFlow(
            self.browser, self.course_id, entry_point='verify-now'
        )
        self.upgrade_page = PaymentAndVerificationFlow(self.browser, self.course_id, entry_point='upgrade')
        self.fake_payment_page = FakePaymentPage(self.browser, self.course_id)
        self.dashboard_page = DashboardPage(self.browser)
        self.problem_page = ProblemPage(self.browser)

        # Add a verified mode to the course
        ModeCreationPage(
            self.browser, self.course_id, mode_slug=u'verified', mode_display_name=u'Verified Certificate',
            min_price=10, suggested_prices='10,20'
        ).visit()

        # Auto-auth register for the course.
        self._auto_auth(self.USERNAME, self.EMAIL, False)

    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 _login_as_a_verified_user(self):
        """
        login as a verififed user
        """

        self._auto_auth(self.USERNAME, self.EMAIL, False)

        # the track selection page cannot be visited. see the other tests to see if any prereq is there.
        # Navigate to the track selection page
        self.track_selection_page.visit()

        # Enter the payment and verification flow by choosing to enroll as verified
        self.track_selection_page.enroll('verified')

        # Proceed to the fake payment page
        self.payment_and_verification_flow.proceed_to_payment()

        # Submit payment
        self.fake_payment_page.submit_payment()

    def test_can_create_proctored_exam_in_studio(self):
        """
        Given that I am a staff member
        When I visit the course outline page in studio.
        And open the subsection edit dialog
        Then I can view all settings related to Proctored and timed exams
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.assertTrue(self.course_outline.proctoring_items_are_displayed())

    def test_proctored_exam_flow(self):
        """
        Given that I am a staff member on the exam settings section
        select advanced settings tab
        When I Make the exam proctored.
        And I login as a verified student.
        And visit the courseware as a verified student.
        Then I can see an option to take the exam as a proctored exam.
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()
        self.course_outline.open_subsection_settings_dialog()

        self.course_outline.select_advanced_tab()
        self.course_outline.make_exam_proctored()

        LogoutPage(self.browser).visit()
        self._login_as_a_verified_user()

        self.courseware_page.visit()
        self.assertTrue(self.courseware_page.can_start_proctored_exam)

    def test_timed_exam_flow(self):
        """
        Given that I am a staff member on the exam settings section
        select advanced settings tab
        When I Make the exam timed.
        And I login as a verified student.
        And visit the courseware as a verified student.
        And I start the timed exam
        Then I am taken to the exam with a timer bar showing
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()
        self.course_outline.open_subsection_settings_dialog()

        self.course_outline.select_advanced_tab()
        self.course_outline.make_exam_timed()

        LogoutPage(self.browser).visit()
        self._login_as_a_verified_user()
        self.courseware_page.visit()

        self.courseware_page.start_timed_exam()
        self.assertTrue(self.courseware_page.is_timer_bar_present)

    def test_time_allotted_field_is_not_visible_with_none_exam(self):
        """
        Given that I am a staff member
        And I have visited the course outline page in studio.
        And the subsection edit dialog is open
        select advanced settings tab
        When I select the 'None' exams radio button
        Then the time allotted text field becomes invisible
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.course_outline.select_advanced_tab()

        self.course_outline.select_none_exam()
        self.assertFalse(self.course_outline.time_allotted_field_visible())

    def test_time_allotted_field_is_visible_with_timed_exam(self):
        """
        Given that I am a staff member
        And I have visited the course outline page in studio.
        And the subsection edit dialog is open
        select advanced settings tab
        When I select the timed exams radio button
        Then the time allotted text field becomes visible
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.course_outline.select_advanced_tab()

        self.course_outline.select_timed_exam()
        self.assertTrue(self.course_outline.time_allotted_field_visible())

    def test_time_allotted_field_is_visible_with_proctored_exam(self):
        """
        Given that I am a staff member
        And I have visited the course outline page in studio.
        And the subsection edit dialog is open
        select advanced settings tab
        When I select the proctored exams radio button
        Then the time allotted text field becomes visible
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.course_outline.select_advanced_tab()

        self.course_outline.select_proctored_exam()
        self.assertTrue(self.course_outline.time_allotted_field_visible())

    def test_exam_review_rules_field_is_visible_with_proctored_exam(self):
        """
        Given that I am a staff member
        And I have visited the course outline page in studio.
        And the subsection edit dialog is open
        select advanced settings tab
        When I select the proctored exams radio button
        Then the review rules textarea field becomes visible
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.course_outline.select_advanced_tab()

        self.course_outline.select_proctored_exam()
        self.assertTrue(self.course_outline.exam_review_rules_field_visible())

    def test_exam_review_rules_field_is_not_visible_with_other_than_proctored_exam(self):
        """
        Given that I am a staff member
        And I have visited the course outline page in studio.
        And the subsection edit dialog is open
        select advanced settings tab
        When I select the timed exams radio button
        Then the review rules textarea field is not visible
        When I select the none exam radio button
        Then the review rules textarea field is not visible
        When I select the practice exam radio button
        Then the review rules textarea field is not visible
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.course_outline.select_advanced_tab()

        self.course_outline.select_timed_exam()
        self.assertFalse(self.course_outline.exam_review_rules_field_visible())

        self.course_outline.select_none_exam()
        self.assertFalse(self.course_outline.exam_review_rules_field_visible())

        self.course_outline.select_practice_exam()
        self.assertFalse(self.course_outline.exam_review_rules_field_visible())

    def test_time_allotted_field_is_visible_with_practice_exam(self):
        """
        Given that I am a staff member
        And I have visited the course outline page in studio.
        And the subsection edit dialog is open
        select advanced settings tab
        When I select the practice exams radio button
        Then the time allotted text field becomes visible
        """
        LogoutPage(self.browser).visit()
        self._auto_auth("STAFF_TESTER", "staff101@example.com", True)
        self.course_outline.visit()

        self.course_outline.open_subsection_settings_dialog()
        self.course_outline.select_advanced_tab()

        self.course_outline.select_practice_exam()
        self.assertTrue(self.course_outline.time_allotted_field_visible())


class CoursewareMultipleVerticalsTest(UniqueCourseTest):
    """
    Test courseware with multiple verticals
    """
    USERNAME = "STUDENT_TESTER"
    EMAIL = "student101@example.com"

    def setUp(self):
        super(CoursewareMultipleVerticalsTest, 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 1,1').add_children(
                    XBlockFixtureDesc('problem', 'Test Problem 1', data='<problem>problem 1 dummy body</problem>'),
                    XBlockFixtureDesc('html', 'html 1', data="<html>html 1 dummy body</html>"),
                    XBlockFixtureDesc('problem', 'Test Problem 2', data="<problem>problem 2 dummy body</problem>"),
                    XBlockFixtureDesc('html', 'html 2', data="<html>html 2 dummy body</html>"),
                ),
                XBlockFixtureDesc('sequential', 'Test Subsection 1,2').add_children(
                    XBlockFixtureDesc('problem', 'Test Problem 3', data='<problem>problem 3 dummy body</problem>'),
                ),
            ),
            XBlockFixtureDesc('chapter', 'Test Section 2').add_children(
                XBlockFixtureDesc('sequential', 'Test Subsection 2,1').add_children(
                    XBlockFixtureDesc('problem', 'Test Problem 4', data='<problem>problem 4 dummy body</problem>'),
                ),
            ),
        ).install()

        # Auto-auth register for the course.
        AutoAuthPage(self.browser, username=self.USERNAME, email=self.EMAIL,
                     course_id=self.course_id, staff=False).visit()
        self.courseware_page.visit()
        self.course_nav = CourseNavPage(self.browser)

    def test_navigation_buttons(self):
        # start in first section
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,1', 0, next_enabled=True, prev_enabled=False)

        # next takes us to next tab in sequential
        self.courseware_page.click_next_button_on_top()
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,1', 1, next_enabled=True, prev_enabled=True)

        # go to last sequential position
        self.courseware_page.go_to_sequential_position(4)
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,1', 3, next_enabled=True, prev_enabled=True)

        # next takes us to next sequential
        self.courseware_page.click_next_button_on_bottom()
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,2', 0, next_enabled=True, prev_enabled=True)

        # next takes us to next chapter
        self.courseware_page.click_next_button_on_top()
        self.assert_navigation_state('Test Section 2', 'Test Subsection 2,1', 0, next_enabled=False, prev_enabled=True)

        # previous takes us to previous chapter
        self.courseware_page.click_previous_button_on_top()
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,2', 0, next_enabled=True, prev_enabled=True)

        # previous takes us to last tab in previous sequential
        self.courseware_page.click_previous_button_on_bottom()
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,1', 3, next_enabled=True, prev_enabled=True)

        # previous takes us to previous tab in sequential
        self.courseware_page.click_previous_button_on_bottom()
        self.assert_navigation_state('Test Section 1', 'Test Subsection 1,1', 2, next_enabled=True, prev_enabled=True)

    def assert_navigation_state(
            self, section_title, subsection_title, subsection_position, next_enabled, prev_enabled
    ):
        """
        Verifies that the navigation state is as expected.
        """
        self.assertTrue(self.course_nav.is_on_section(section_title, subsection_title))
        self.assertEquals(self.courseware_page.sequential_position, subsection_position)
        self.assertEquals(self.courseware_page.is_next_button_enabled, next_enabled)
        self.assertEquals(self.courseware_page.is_previous_button_enabled, prev_enabled)

    def test_tab_position(self):
        # test that using the position in the url direct to correct tab in courseware
        self.course_nav.go_to_section('Test Section 1', 'Test Subsection 1,1')
        subsection_url = self.course_nav.active_subsection_url
        url_part_list = subsection_url.split('/')
        self.assertEqual(len(url_part_list), 9)

        course_id = url_part_list[4]
        chapter_id = url_part_list[-3]
        subsection_id = url_part_list[-2]
        problem1_page = CoursewareSequentialTabPage(
            self.browser,
            course_id=course_id,
            chapter=chapter_id,
            subsection=subsection_id,
            position=1
        ).visit()
        self.assertIn('problem 1 dummy body', problem1_page.get_selected_tab_content())

        html1_page = CoursewareSequentialTabPage(
            self.browser,
            course_id=course_id,
            chapter=chapter_id,
            subsection=subsection_id,
            position=2
        ).visit()
        self.assertIn('html 1 dummy body', html1_page.get_selected_tab_content())

        problem2_page = CoursewareSequentialTabPage(
            self.browser,
            course_id=course_id,
            chapter=chapter_id,
            subsection=subsection_id,
            position=3
        ).visit()
        self.assertIn('problem 2 dummy body', problem2_page.get_selected_tab_content())

        html2_page = CoursewareSequentialTabPage(
            self.browser,
            course_id=course_id,
            chapter=chapter_id,
            subsection=subsection_id,
            position=4
        ).visit()
        self.assertIn('html 2 dummy body', html2_page.get_selected_tab_content())

    @attr('a11y')
    def test_courseware_a11y(self):
        """
        Run accessibility audit for the problem type.
        """
        self.course_nav.go_to_section('Test Section 1', 'Test Subsection 1,1')
        # Set the scope to the sequence navigation
        self.courseware_page.a11y_audit.config.set_scope(
            include=['div.sequence-nav'])
        self.courseware_page.a11y_audit.check_for_accessibility_errors()


class ProblemStateOnNavigationTest(UniqueCourseTest):
    """
    Test courseware with problems in multiple verticals
    """
    USERNAME = "STUDENT_TESTER"
    EMAIL = "student101@example.com"

    problem1_name = 'MULTIPLE CHOICE TEST PROBLEM 1'
    problem2_name = 'MULTIPLE CHOICE TEST PROBLEM 2'

    def setUp(self):
        super(ProblemStateOnNavigationTest, self).setUp()

        self.courseware_page = CoursewarePage(self.browser, self.course_id)

        # Install a course with section, tabs and multiple choice problems.
        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 1,1').add_children(
                    self.create_multiple_choice_problem(self.problem1_name),
                    self.create_multiple_choice_problem(self.problem2_name),
                ),
            ),
        ).install()

        # Auto-auth register for the course.
        AutoAuthPage(
            self.browser, username=self.USERNAME, email=self.EMAIL,
            course_id=self.course_id, staff=False
        ).visit()

        self.courseware_page.visit()
        self.problem_page = ProblemPage(self.browser)

    def create_multiple_choice_problem(self, problem_name):
        """
        Return the Multiple Choice Problem Descriptor, given the name of the problem.
        """
        factory = MultipleChoiceResponseXMLFactory()
        xml_data = factory.build_xml(
            question_text='The correct answer is Choice 2',
            choices=[False, False, True, False],
            choice_names=['choice_0', 'choice_1', 'choice_2', 'choice_3']
        )

        return XBlockFixtureDesc(
            'problem',
            problem_name,
            data=xml_data,
            metadata={'rerandomize': 'always'}
        )

    def go_to_tab_and_assert_problem(self, position, problem_name):
        """
        Go to sequential tab and assert that we are on problem whose name is given as a parameter.
        Args:
            position: Position of the sequential tab
            problem_name: Name of the problem
        """
        self.courseware_page.go_to_sequential_position(position)
        self.problem_page.wait_for_element_presence(
            self.problem_page.CSS_PROBLEM_HEADER,
            'wait for problem header'
        )
        self.assertEqual(self.problem_page.problem_name, problem_name)

    def test_perform_problem_check_and_navigate(self):
        """
        Scenario:
        I go to sequential position 1
        Facing problem1, I select 'choice_1'
        Then I click check button
        Then I go to sequential position 2
        Then I came back to sequential position 1 again
        Facing problem1, I observe the problem1 content is not
        outdated before and after sequence navigation
        """
        # Go to sequential position 1 and assert that we are on problem 1.
        self.go_to_tab_and_assert_problem(1, self.problem1_name)

        # Update problem 1's content state by clicking check button.
        self.problem_page.click_choice('choice_choice_1')
        self.problem_page.click_check()
        self.problem_page.wait_for_expected_status('label.choicegroup_incorrect', 'incorrect')

        # Save problem 1's content state as we're about to switch units in the sequence.
        problem1_content_before_switch = self.problem_page.problem_content

        # Go to sequential position 2 and assert that we are on problem 2.
        self.go_to_tab_and_assert_problem(2, self.problem2_name)

        # Come back to our original unit in the sequence and assert that the content hasn't changed.
        self.go_to_tab_and_assert_problem(1, self.problem1_name)
        problem1_content_after_coming_back = self.problem_page.problem_content
        self.assertEqual(problem1_content_before_switch, problem1_content_after_coming_back)

    def test_perform_problem_save_and_navigate(self):
        """
        Scenario:
        I go to sequential position 1
        Facing problem1, I select 'choice_1'
        Then I click save button
        Then I go to sequential position 2
        Then I came back to sequential position 1 again
        Facing problem1, I observe the problem1 content is not
        outdated before and after sequence navigation
        """
        # Go to sequential position 1 and assert that we are on problem 1.
        self.go_to_tab_and_assert_problem(1, self.problem1_name)

        # Update problem 1's content state by clicking save button.
        self.problem_page.click_choice('choice_choice_1')
        self.problem_page.click_save()
        self.problem_page.wait_for_expected_status('div.capa_alert', 'saved')

        # Save problem 1's content state as we're about to switch units in the sequence.
        problem1_content_before_switch = self.problem_page.problem_content

        # Go to sequential position 2 and assert that we are on problem 2.
        self.go_to_tab_and_assert_problem(2, self.problem2_name)

        # Come back to our original unit in the sequence and assert that the content hasn't changed.
        self.go_to_tab_and_assert_problem(1, self.problem1_name)
        problem1_content_after_coming_back = self.problem_page.problem_content
        self.assertIn(problem1_content_after_coming_back, problem1_content_before_switch)

    def test_perform_problem_reset_and_navigate(self):
        """
        Scenario:
        I go to sequential position 1
        Facing problem1, I select 'choice_1'
        Then perform the action – check and reset
        Then I go to sequential position 2
        Then I came back to sequential position 1 again
        Facing problem1, I observe the problem1 content is not
        outdated before and after sequence navigation
        """
        # Go to sequential position 1 and assert that we are on problem 1.
        self.go_to_tab_and_assert_problem(1, self.problem1_name)

        # Update problem 1's content state – by performing reset operation.
        self.problem_page.click_choice('choice_choice_1')
        self.problem_page.click_check()
        self.problem_page.wait_for_expected_status('label.choicegroup_incorrect', 'incorrect')
        self.problem_page.click_reset()
        self.problem_page.wait_for_expected_status('span.unanswered', 'unanswered')

        # Save problem 1's content state as we're about to switch units in the sequence.
        problem1_content_before_switch = self.problem_page.problem_content

        # Go to sequential position 2 and assert that we are on problem 2.
        self.go_to_tab_and_assert_problem(2, self.problem2_name)

        # Come back to our original unit in the sequence and assert that the content hasn't changed.
        self.go_to_tab_and_assert_problem(1, self.problem1_name)
        problem1_content_after_coming_back = self.problem_page.problem_content
        self.assertEqual(problem1_content_before_switch, problem1_content_after_coming_back)