test_enrollment.py

from __future__ import annotations


__copyright__ = "Copyright (C) 2017 Dong Zhuang"

__license__ = """
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
"""

import unittest

import pytest
from django.conf import settings
from django.contrib.auth import get_user_model
from django.core import mail
from django.test import RequestFactory, TestCase
from django.test.utils import override_settings  # noqa
from django.urls import reverse

from course import constants, enrollment
from course.constants import (
    participation_status as p_status,
    user_status as u_status,
)
from course.models import Participation, ParticipationPreapproval, ParticipationRole
from relate.utils import string_concat
from tests import factories
from tests.base_test_mixins import (
    CoursesTestMixinBase,
    MockAddMessageMixing,
    SingleCoursePageTestMixin,
    SingleCourseTestMixin,
)
from tests.utils import LocmemBackendTestsMixin, mock


TEST_EMAIL_SUFFIX1 = "@suffix.com"
TEST_EMAIL_SUFFIX2 = "suffix.com"

EMAIL_CONNECTIONS = "EMAIL_CONNECTIONS"
EMAIL_CONNECTION_DEFAULT = "EMAIL_CONNECTION_DEFAULT"
NO_REPLY_EMAIL_FROM = "NO_REPLY_EMAIL_FROM"
NOTIFICATION_EMAIL_FROM = "NOTIFICATION_EMAIL_FROM"
GRADER_FEEDBACK_EMAIL_FROM = "GRADER_FEEDBACK_EMAIL_FROM"
STUDENT_INTERACT_EMAIL_FROM = "STUDENT_INTERACT_EMAIL_FROM"
ENROLLMENT_EMAIL_FROM = "ENROLLMENT_EMAIL_FROM"

# {{{ message constants

MESSAGE_ENROLLMENT_SENT_TEXT = (
    "Enrollment request sent. You will receive notification "
    "by email once your request has been acted upon.")
MESSAGE_ENROLL_REQUEST_PENDING_TEXT = (
    "Your enrollment request is pending. You will be "
    "notified once it has been acted upon.")
MESSAGE_ENROLL_DENIED_NOT_ALLOWED_TEXT = (
    "Your enrollment request had been denied. Enrollment is not allowed.")
MESSAGE_ENROLL_DROPPED_NOT_ALLOWED_TEXT = (
    "You had been dropped from the course. Re-enrollment is not allowed.")
MESSAGE_ENROLL_REQUEST_ALREADY_PENDING_TEXT = (
    "You have previously sent the enrollment request. "
    "Re-sending the request is not allowed.")
MESSAGE_PARTICIPATION_ALREADY_EXIST_TEXT = (
    "A participation already exists. Enrollment attempt aborted.")
MESSAGE_CANNOT_REENROLL_TEXT = ("Already enrolled. Cannot re-enroll.")
MESSAGE_SUCCESSFULLY_ENROLLED_TEXT = ("Successfully enrolled.")
MESSAGE_EMAIL_SUFFIX_REQUIRED_PATTERN = (
    "Enrollment not allowed. Please use your '%s' email to enroll.")
MESSAGE_NOT_ACCEPTING_ENROLLMENTS_TEXT = ("Course is not accepting enrollments.")
MESSAGE_ENROLL_ONLY_ACCEPT_POST_REQUEST_TEXT = (
    "Can only enroll using POST request")
MESSAGE_ENROLLMENT_DENIED_TEXT = "Successfully denied."
MESSAGE_ENROLLMENT_DROPPED_TEXT = "Successfully dropped."

MESSAGE_BATCH_PREAPPROVED_RESULT_PATTERN = (
    "%(n_created)d preapprovals created, "
    "%(n_exist)d already existed, "
    "%(n_requested_approved)d pending requests approved.")

MESSAGE_EMAIL_NOT_CONFIRMED_TEXT = (
    "Your email address is not yet confirmed. "
    "Confirm your email to continue.")
MESSAGE_PARTICIPATION_CHANGE_SAVED_TEXT = ("Changes saved.")

EMAIL_NEW_ENROLLMENT_REQUEST_TITLE_PATTERN = (
    string_concat("[%s] ", "New enrollment request"))
EMAIL_ENROLLMENT_DECISION_TITLE_PATTERN = (
    string_concat("[%s] ", "Your enrollment request"))

VALIDATION_ERROR_USER_NOT_CONFIRMED = (
    "This user has not confirmed his/her email.")

# }}}


def get_not_empty_count_from_list(lst):
    return len([data for data in lst if data.strip()])


class EnrollmentTestMixin(MockAddMessageMixing, CoursesTestMixinBase):

    @classmethod
    def setUpTestData(cls):
        super().setUpTestData()
        cls.course = factories.CourseFactory()

    def setUp(self):
        super().setUp()
        self.course.refresh_from_db()

    @property
    def course_page_url(self):
        return self.get_course_page_url(self.course.identifier)

    @property
    def enroll_request_url(self):
        return reverse("relate-enroll", args=[self.course.identifier])

    @classmethod
    def get_participation_edit_url(cls, participation_id):
        return reverse("relate-edit_participation",
                       args=[cls.course.identifier, participation_id])

    def get_participation_count_by_status(self, status):
        return Participation.objects.filter(
            course__identifier=self.course.identifier,
            status=status
        ).count()

    def update_course(self, **kwargs):
        self.course.__dict__.update(kwargs)
        self.course.save()

    def update_require_approval_course(self, **kwargs):
        self.course.__dict__.update(kwargs)
        self.course.enrollment_approval_required = True
        self.course.save()

    def get_test_participation(self, **kwargs):
        return factories.ParticipationFactory(
            course=self.course, **kwargs)

    def get_test_preapproval(self, **kwargs):
        defaults = {"course": self.course,
                    "email": None,
                    "institutional_id": None}
        defaults.update(kwargs)

        return factories.ParticipationPreapprovalFactory(**defaults)

    def assertParticipationStatusCallCount(self, expected_counts):  # noqa
        from collections import OrderedDict
        d = OrderedDict()
        counts = []
        for status in sorted(
                dict(constants.PARTICIPATION_STATUS_CHOICES).keys()):
            count = Participation.objects.filter(
                course=self.course, status=status
            ).count()
            d[status] = count
            counts.append(count)

        self.assertListEqual(counts, expected_counts, repr(d))

    @property
    def student_role_post_data(self):
        role, _ = (ParticipationRole.objects.get_or_create(
            course=self.course, identifier="student"))
        return [str(role.pk)]

    @property
    def preapproval_url(self):
        return reverse("relate-create_preapprovals",
                            args=[self.course.identifier])

    @property
    def default_preapprove_role(self):
        role, _ = (ParticipationRole.objects.get_or_create(
            course=self.course, identifier="student"))
        return [str(role.pk)]

    def get_preapproval_count(self):
        return ParticipationPreapproval.objects.all().count()


class EnrollViewTest(EnrollmentTestMixin, TestCase):
    # test enrollment.enroll_view

    def test_participation_status_requested(self):
        participation = self.get_test_participation(
            status=p_status.requested)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        with self.temporarily_switch_to_user(participation.user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLL_REQUEST_ALREADY_PENDING_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        self.assertEqual(len(mail.outbox), 0)

    def test_participation_status_denied(self):
        participation = self.get_test_participation(
            status=p_status.denied)
        self.assertParticipationStatusCallCount([0, 1, 0, 0])
        with self.temporarily_switch_to_user(participation.user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLL_DENIED_NOT_ALLOWED_TEXT)
        self.assertParticipationStatusCallCount([0, 1, 0, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_participation_status_dropped(self):
        participation = self.get_test_participation(
            status=p_status.dropped)
        self.assertParticipationStatusCallCount([0, 0, 1, 0])
        with self.temporarily_switch_to_user(participation.user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLL_DROPPED_NOT_ALLOWED_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 1, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_participation_status_active(self):
        participation = self.get_test_participation(
            status=p_status.active)
        self.assertParticipationStatusCallCount([1, 0, 0, 0])
        with self.temporarily_switch_to_user(participation.user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_CANNOT_REENROLL_TEXT)
        self.assertParticipationStatusCallCount([1, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_not_accepts_enrollment(self):
        self.update_course(accepts_enrollment=False)
        user = factories.UserFactory()

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_NOT_ACCEPTING_ENROLLMENTS_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_not_post_request(self):
        user = factories.UserFactory()
        with self.temporarily_switch_to_user(user):
            resp = self.client.get(self.enroll_request_url)
            self.assertRedirects(
                resp, self.course_page_url, fetch_redirect_response=False)
            self.assertAddMessageCallCount(1)
            self.assertAddMessageCalledWith(
                MESSAGE_ENROLL_ONLY_ACCEPT_POST_REQUEST_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_user_not_active(self):
        for status in dict(constants.USER_STATUS_CHOICES).keys():
            if status != u_status.active:
                with self.subTest(user_status=status):
                    user = factories.UserFactory(status=status)
                    with self.temporarily_switch_to_user(user):
                        resp = self.client.post(self.enroll_request_url)
                    self.assertRedirects(
                        resp, self.course_page_url, fetch_redirect_response=False)
                    self.assertAddMessageCallCount(1)
                    self.assertAddMessageCalledWith(
                        MESSAGE_EMAIL_NOT_CONFIRMED_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_no_restrictions(self):
        user = factories.UserFactory()
        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_SUCCESSFULLY_ENROLLED_TEXT)

        self.assertParticipationStatusCallCount([1, 0, 0, 0])

    def test_no_restrictions_user_has_no_instid(self):
        user = factories.UserFactory(institutional_id=None)
        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_SUCCESSFULLY_ENROLLED_TEXT)

        self.assertParticipationStatusCallCount([1, 0, 0, 0])

    def test_not_matching_preapproved_email(self):
        self.update_require_approval_course()
        user = factories.UserFactory()
        self.get_test_preapproval(email="blabla@com")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertEqual(len(mail.outbox), 1)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])

    def test_matched_preapproved_email(self):
        self.update_require_approval_course()
        user = factories.UserFactory()
        self.get_test_preapproval(email=user.email)

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_SUCCESSFULLY_ENROLLED_TEXT)
        self.assertParticipationStatusCallCount([1, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_not_require_inst_id_verified(self):
        self.update_require_approval_course(
            preapproval_require_verified_inst_id=False)

        for verified in [True, False]:
            with self.subTest(user_inst_id_verified=verified):
                user = factories.UserFactory(institutional_id_verified=verified)
                self.get_test_preapproval(institutional_id=user.institutional_id)

                with self.temporarily_switch_to_user(user):
                    resp = self.client.post(self.enroll_request_url)
                self.assertRedirects(
                    resp, self.course_page_url, fetch_redirect_response=False)
                self.assertAddMessageCallCount(1)
                self.assertAddMessageCalledWith(MESSAGE_SUCCESSFULLY_ENROLLED_TEXT)

        self.assertParticipationStatusCallCount([2, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 2)

    def test_course_require_inst_id_verified_user_inst_id_verified1(self):
        # matched
        self.update_require_approval_course(
            preapproval_require_verified_inst_id=True)

        user = factories.UserFactory(institutional_id_verified=True)
        self.get_test_preapproval(institutional_id=user.institutional_id)

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_SUCCESSFULLY_ENROLLED_TEXT)
        self.assertParticipationStatusCallCount([1, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_require_inst_id_verified_user_inst_id_verified2(self):
        # not matched
        self.update_require_approval_course(
            preapproval_require_verified_inst_id=True)

        user = factories.UserFactory(institutional_id_verified=True)
        self.get_test_preapproval(institutional_id="not_exist_instid")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertEqual(len(mail.outbox), 1)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])

    def test_preapprved_user_updated_inst_id_after_req_enrollment_roles_match(self):
        # Check assigned roles, testing issue #735
        self.update_require_approval_course(
            preapproval_require_verified_inst_id=True)

        user = factories.UserFactory()
        inst_id = user.institutional_id

        # Temporarily remove his/her inst_id
        user.institutional_id = None
        user.save()

        expected_role_identifier = "test_student"

        self.get_test_preapproval(
            institutional_id=inst_id, roles=[expected_role_identifier])

        with self.temporarily_switch_to_user(user):
            self.client.post(self.enroll_request_url)

        # Add back the inst_id
        user.institutional_id = inst_id
        user.institutional_id_verified = True
        user.save()

        user_participation = Participation.objects.get(user=user)
        self.assertIn(expected_role_identifier,
                      [role.identifier for role in user_participation.roles.all()])

    def test_course_require_inst_id_verified_user_inst_id_not_verified1(self):
        # thought matched
        self.update_require_approval_course(
            preapproval_require_verified_inst_id=True)

        user = factories.UserFactory(institutional_id_verified=False)
        self.get_test_preapproval(institutional_id=user.institutional_id)

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_require_inst_id_verified_user_inst_id_not_verified2(self):
        # not matched
        self.update_require_approval_course(
            preapproval_require_verified_inst_id=True)

        user = factories.UserFactory(institutional_id_verified=False)
        self.get_test_preapproval(institutional_id="not_exist_instid")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_require_email_suffix_but_need_approval(self):
        self.update_require_approval_course(
            enrollment_required_email_suffix="@blabla.com")

        user = factories.UserFactory(email="abc@blabla.com")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_require_email_suffix_passed_without_at(self):
        # without @ in suffix config
        self.update_require_approval_course(
            enrollment_required_email_suffix="blabla.com")
        user = factories.UserFactory(email="abc@blabla.com")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_require_email_suffix_passed_without_at_pattern2(self):
        # without @ in suffix config
        self.update_require_approval_course(
            enrollment_required_email_suffix="blabla.com")
        user = factories.UserFactory(email="abc@edu.blabla.com")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_ENROLLMENT_SENT_TEXT)
        self.assertParticipationStatusCallCount([0, 0, 0, 1])
        self.assertEqual(len(mail.outbox), 1)

    def test_course_require_email_suffix_failed(self):
        required_suffix = "blabla.com"
        self.update_require_approval_course(
            enrollment_required_email_suffix=required_suffix)
        user = factories.UserFactory(email="abc@blabla.com.hk")

        with self.temporarily_switch_to_user(user):
            resp = self.client.post(self.enroll_request_url)
        self.assertRedirects(
            resp, self.course_page_url, fetch_redirect_response=False)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(
            MESSAGE_EMAIL_SUFFIX_REQUIRED_PATTERN % required_suffix)
        self.assertParticipationStatusCallCount([0, 0, 0, 0])
        self.assertEqual(len(mail.outbox), 0)

    def test_integrity_error(self):
        with mock.patch(
                "course.enrollment.handle_enrollment_request"
        ) as mock_handle_enrollment_request:
            from django.db import IntegrityError
            mock_handle_enrollment_request.side_effect = IntegrityError
            user = factories.UserFactory()
            with self.temporarily_switch_to_user(user):
                resp = self.client.post(self.enroll_request_url)
            self.assertRedirects(
                resp, self.course_page_url, fetch_redirect_response=False)
            self.assertAddMessageCallCount(1)
            self.assertAddMessageCalledWith(MESSAGE_PARTICIPATION_ALREADY_EXIST_TEXT)

            self.assertParticipationStatusCallCount([0, 0, 0, 0])


class HandleEnrollmentRequestTest(SingleCourseTestMixin,
                                  EnrollmentTestMixin, TestCase):
    # test enrollment.handle_enrollment_request
    def setUp(self):
        super().setUp()
        fake_send_enrollment_decision = mock.patch(
            "course.enrollment.send_enrollment_decision")
        self.mock_send_enrollment_decision = fake_send_enrollment_decision.start()
        self.addCleanup(fake_send_enrollment_decision.stop)

    def test_approve_new(self):
        user = factories.UserFactory()
        status = p_status.active
        roles = [
            factories.ParticipationRoleFactory(course=self.course, identifier="1"),
            factories.ParticipationRoleFactory(course=self.course, identifier="2")]
        request = mock.MagicMock()

        participation = enrollment.handle_enrollment_request(
            self.course, user, status, roles, request=request)

        self.assertEqual(participation.user, user)
        self.assertEqual(participation.status, status)
        self.assertSetEqual(
            set(participation.roles.all()), set(roles))
        self.assertEqual(self.mock_send_enrollment_decision.call_count, 1)
        self.mock_send_enrollment_decision.assert_called_with(
            participation, True, request)

    def test_approve_new_none_roles(self):
        user = factories.UserFactory()
        status = p_status.active
        roles = None
        request = mock.MagicMock()

        participation = enrollment.handle_enrollment_request(
            self.course, user, status, roles, request=request)

        self.assertEqual(participation.user, user)
        self.assertEqual(participation.status, status)
        self.assertSetEqual(set(participation.roles.all()), set())
        self.assertEqual(self.mock_send_enrollment_decision.call_count, 1)
        self.mock_send_enrollment_decision.assert_called_with(
            participation, True, request)

    def test_deny_new(self):
        user = factories.UserFactory()
        status = p_status.denied
        roles = [
            factories.ParticipationRoleFactory(course=self.course, identifier="3"),
            factories.ParticipationRoleFactory(course=self.course, identifier="4")]
        request = mock.MagicMock()

        participation = enrollment.handle_enrollment_request(
            self.course, user, status, roles, request=request)

        self.assertEqual(participation.user, user)
        self.assertEqual(participation.status, status)
        self.assertSetEqual(set(participation.roles.all()), set(roles))
        self.assertEqual(self.mock_send_enrollment_decision.call_count, 1)
        self.mock_send_enrollment_decision.assert_called_with(
            participation, False, request)

    def test_approve_requested(self):
        user = factories.UserFactory()
        request_participation = factories.ParticipationFactory(
            course=self.course, user=user, status=p_status.requested,
        )
        status = p_status.active
        roles = [
            factories.ParticipationRoleFactory(course=self.course, identifier="1"),
            factories.ParticipationRoleFactory(course=self.course, identifier="2")]
        request = mock.MagicMock()

        participation = enrollment.handle_enrollment_request(
            self.course, user, status, roles, request=request)

        self.assertEqual(participation.user, user)
        self.assertEqual(participation.status, status)
        self.assertSetEqual(
            set(participation.roles.all()),
            set(request_participation.roles.all()))
        self.assertEqual(self.mock_send_enrollment_decision.call_count, 1)
        self.mock_send_enrollment_decision.assert_called_with(
            participation, True, request)

    def test_deny_requested(self):
        user = factories.UserFactory()
        request_participation = factories.ParticipationFactory(
            course=self.course, user=user, status=p_status.requested,
        )
        status = p_status.denied
        roles = [
            factories.ParticipationRoleFactory(course=self.course, identifier="1"),
            factories.ParticipationRoleFactory(course=self.course, identifier="2")]
        request = mock.MagicMock()

        participation = enrollment.handle_enrollment_request(
            self.course, user, status, roles, request=request)

        self.assertEqual(participation.user, user)
        self.assertEqual(participation.status, status)
        self.assertSetEqual(
            set(participation.roles.all()),
            set(request_participation.roles.all()))
        self.assertEqual(self.mock_send_enrollment_decision.call_count, 1)
        self.mock_send_enrollment_decision.assert_called_with(
            participation, False, request)


class SendEnrollmentDecisionTest(SingleCourseTestMixin, TestCase):
    # test enrollment.send_enrollment_decision
    def test_request_none(self):
        participation = factories.ParticipationFactory()
        enrollment.send_enrollment_decision(participation, True, None)
        self.assertEqual(len(mail.outbox), 1)


class EnrollmentTestBaseMixin(MockAddMessageMixing, SingleCourseTestMixin):

    @classmethod
    def setUpTestData(cls):
        super().setUpTestData()
        (cls.non_ptcp_active_user1, cls.non_ptcp_active_user2) = (
            factories.UserFactory.create_batch(
                size=2))
        (cls.non_ptcp_unconfirmed_user1, cls.non_ptcp_unconfirmed_user2) = (
            factories.UserFactory.create_batch(
                size=2, status=u_status.unconfirmed))

    @property
    def enroll_request_url(self):
        return reverse("relate-enroll", args=[self.course.identifier])

    @classmethod
    def get_participation_edit_url(cls, participation_id):
        return reverse("relate-edit_participation",
                       args=[cls.course.identifier, participation_id])

    def get_participation_count_by_status(self, status):
        return Participation.objects.filter(
            course__identifier=self.course.identifier,
            status=status
        ).count()

    @property
    def student_role_post_data(self):
        role, _ = (ParticipationRole.objects.get_or_create(
            course=self.course, identifier="student"))
        return [str(role.pk)]


class EnrollmentDecisionTestMixin(LocmemBackendTestsMixin, EnrollmentTestBaseMixin):
    courses_attributes_extra_list = [{"enrollment_approval_required": True}]

    @classmethod
    def setUpTestData(cls):
        super().setUpTestData()
        cls.my_participation = cls.create_participation(
            cls.course, cls.non_ptcp_active_user1,
            status=p_status.requested)
        cls.my_participation_edit_url = (
            cls.get_participation_edit_url(cls.my_participation.pk))

    def get_edit_participation_form_data(self, op, **post_form_kwargs):
        time_factor = [str(self.my_participation.time_factor)]
        roles = [str(r.pk) for r in self.my_participation.roles.all()]
        notes = [str(self.my_participation.notes)]

        form_data = {"time_factor": time_factor,
                     "roles": roles, "notes": notes,
                     op: ""}
        form_data.update(post_form_kwargs)

        return form_data


class EnrollmentDecisionTest(EnrollmentDecisionTestMixin, TestCase):
    courses_attributes_extra_list = [{"enrollment_approval_required": True}]

    @property
    def add_new_url(self):
        return self.get_participation_edit_url(-1)

    def test_edit_participation_view_enroll_decision_approve(self):
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            1)
        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.post(self.my_participation_edit_url,
                               self.get_edit_participation_form_data("approve"))

        self.assertEqual(resp.status_code, 200)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            0)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith(MESSAGE_SUCCESSFULLY_ENROLLED_TEXT)
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            0)

    def test_edit_participation_view_enroll_decision_approve_no_permission1(self):
        with self.temporarily_switch_to_user(self.student_participation.user):
            resp = self.client.post(self.my_participation_edit_url,
                               self.get_edit_participation_form_data("approve"))

        self.assertEqual(resp.status_code, 403)
        self.assertEqual(len(mail.outbox), 0)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            1)

    def test_edit_participation_view_enroll_decision_approve_no_permission2(self):
        with self.temporarily_switch_to_user(self.non_ptcp_active_user1):
            resp = self.client.post(self.my_participation_edit_url,
                               self.get_edit_participation_form_data("approve"))

        self.assertEqual(resp.status_code, 403)
        self.assertEqual(len(mail.outbox), 0)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            1)

    def test_edit_participation_view_course_not_match(self):
        other_course_participation = factories.ParticipationFactory(
            course=factories.CourseFactory(identifier="another-course")
        )
        url = self.get_participation_edit_url(other_course_participation.pk)
        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.get(url)
            self.assertEqual(resp.status_code, 400)

            resp = self.client.post(url, data={})
            self.assertEqual(resp.status_code, 400)

    def test_edit_participation_update_individual_permission(self):
        url = self.get_participation_edit_url(self.student_participation.pk)
        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.post(
                url,
                self.get_edit_participation_form_data(
                    "submit", individual_permissions=[
                        "view_participant_masked_profile",
                        "view_hidden_course_page",
                    ]))
            self.assertEqual(resp.status_code, 200)
            self.assertFormErrorLoose(resp, None)
            self.student_participation.refresh_from_db()
            from course.constants import participation_permission as pperm
            self.assertTrue(
                self.student_participation.has_permission(
                    pperm.view_participant_masked_profile)
            )
            self.assertTrue(
                self.student_participation.has_permission(
                    pperm.view_hidden_course_page)
            )
            self.assertFalse(
                self.student_participation.has_permission(
                    pperm.edit_course)
            )

    def test_edit_participation_view_enroll_decision_deny(self):
        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.post(
                self.my_participation_edit_url,
                self.get_edit_participation_form_data("deny"))

        self.assertEqual(resp.status_code, 200)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            0)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith([MESSAGE_ENROLLMENT_DENIED_TEXT])
        self.assertEqual(len(mail.outbox), 1)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            0)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.denied),
            1)

    def test_edit_participation_view_unknown_post_op(self):
        post_data = self.get_edit_participation_form_data("approve").copy()
        del post_data["approve"]

        # add an unknown post operation
        post_data["unknown"] = ""

        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.post(
                self.my_participation_edit_url, data=post_data)

        self.assertEqual(resp.status_code, 200)
        self.assertFormErrorLoose(resp, None)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            1)
        self.assertAddMessageCallCount(0)
        self.assertEqual(len(mail.outbox), 0)

    def test_edit_participation_view_enroll_decision_drop(self):
        self.create_participation(self.course, self.non_ptcp_unconfirmed_user1,
                                  status=p_status.active)
        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.post(self.my_participation_edit_url,
                               self.get_edit_participation_form_data("drop"))
        self.assertEqual(resp.status_code, 200)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.dropped),
            1)
        self.assertAddMessageCalledWith([MESSAGE_ENROLLMENT_DROPPED_TEXT])
        self.assertEqual(len(mail.outbox), 0)

    def test_edit_participation_view_add_new_unconfirmed_user(self):
        self.client.force_login(self.instructor_participation.user)
        resp = self.client.get(self.add_new_url)
        self.assertTrue(resp.status_code, 200)

        if self.non_ptcp_unconfirmed_user1.status != u_status.unconfirmed:
            self.non_ptcp_unconfirmed_user1.status = u_status.unconfirmed
            self.non_ptcp_unconfirmed_user1.save()

        expected_active_user_count = (
            get_user_model()
            .objects.filter(status=u_status.unconfirmed).count())

        expected_active_participation_count = (
            self.get_participation_count_by_status(p_status.active))

        form_data = {"user": [str(self.non_ptcp_unconfirmed_user1.pk)],
                     "time_factor": 1,
                     "roles": self.student_role_post_data, "notes": [""],
                     "add_new": True
                     }
        add_post_data = {"submit": [""]}
        add_post_data.update(form_data)
        resp = self.client.post(self.add_new_url, add_post_data, follow=True)
        self.assertFormError(resp.context["form"], "user",
                             VALIDATION_ERROR_USER_NOT_CONFIRMED)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.active),
            expected_active_participation_count)

        self.assertEqual(
            get_user_model()
            .objects.filter(status=u_status.unconfirmed).count(),
            expected_active_user_count)
        self.assertAddMessageCallCount(0)
        self.assertEqual(len(mail.outbox), 0)

    def test_edit_participation_view_add_new_active_user(self):
        self.client.force_login(self.instructor_participation.user)
        resp = self.client.get(self.add_new_url)
        self.assertTrue(resp.status_code, 200)

        if self.non_ptcp_unconfirmed_user2.status != u_status.active:
            self.non_ptcp_unconfirmed_user2.status = u_status.active
            self.non_ptcp_unconfirmed_user2.save()

        expected_active_user_count = (
            get_user_model()
            .objects.filter(status=u_status.unconfirmed).count()
        )

        expected_active_participation_count = (
            self.get_participation_count_by_status(p_status.active) + 1
        )

        form_data = {"user": [str(self.non_ptcp_unconfirmed_user2.pk)],
                     "time_factor": 1,
                     "roles": self.student_role_post_data, "notes": [""],
                     "add_new": True
                     }
        add_post_data = {"submit": [""]}
        add_post_data.update(form_data)
        resp = self.client.post(self.add_new_url, add_post_data, follow=True)
        self.assertEqual(resp.status_code, 200)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.active),
            expected_active_participation_count)

        self.assertEqual(
            get_user_model()
            .objects.filter(status=u_status.unconfirmed).count(),
            expected_active_user_count)
        self.assertAddMessageCallCount(1)
        self.assertAddMessageCalledWith([MESSAGE_PARTICIPATION_CHANGE_SAVED_TEXT])
        self.assertEqual(len(mail.outbox), 0)

    def test_edit_participation_view_add_new_invalid_choice(self):
        form_data = {"user": [str(self.student_participation.user.pk)],
                     "time_factor": 0.5,
                     "roles": self.student_role_post_data, "notes": [""],
                     "add_new": True
                     }
        add_post_data = {"submit": [""]}
        add_post_data.update(form_data)
        with self.temporarily_switch_to_user(self.instructor_participation.user):
            resp = self.client.post(self.add_new_url, add_post_data, follow=True)

        from django.forms.models import ModelChoiceField
        self.assertFormError(
            resp.context["form"], "user",
            ModelChoiceField.default_error_messages["invalid_choice"])

    def test_edit_participation_view_enroll_decision_deny_no_permission1(self):
        with self.temporarily_switch_to_user(self.student_participation.user):
            resp = self.client.post(
                self.my_participation_edit_url,
                self.get_edit_participation_form_data("deny"))

        self.assertEqual(resp.status_code, 403)
        self.assertEqual(len(mail.outbox), 0)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            1)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.denied),
            0)

    def test_edit_participation_view_enroll_decision_deny_no_permission2(self):
        with self.temporarily_switch_to_user(self.non_ptcp_active_user1):
            resp = self.client.post(
                self.my_participation_edit_url,
                self.get_edit_participation_form_data("deny"))

        self.assertEqual(resp.status_code, 403)
        self.assertEqual(len(mail.outbox), 0)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.requested),
            1)
        self.assertEqual(
            self.get_participation_count_by_status(p_status.denied),
            0)

    def test_edit_participation_view_save_integrity_error(self):
        with mock.patch(
                "course.enrollment.Participation.save"
        ) as mock_participation_save, mock.patch(
            "course.enrollment.EditParticipationForm.save"
        ) as mock_form_save:
            from django.db import IntegrityError
            mock_participation_save.side_effect = IntegrityError("my_error")
            mock_form_save.side_effect = IntegrityError("my_error")

            with self.temporarily_switch_to_user(
                    self.instructor_participation.user):
                resp = self.client.post(
                    self.my_participation_edit_url,
                    self.get_edit_participation_form_data("deny"))

            self.assertEqual(resp.status_code, 200)
            self.assertEqual(
                self.get_participation_count_by_status(p_status.requested),
                1)
            expected_error_msg = (
                "A data integrity issue was detected when saving "