add cert available date to lms

for EDUCATOR-525

lms/djangoapps/courseware/courses.py

@@ -15,7 +15,8 @@ from courseware.date_summary import (
     CourseStartDate,
     TodaysDate,
     VerificationDeadlineDate,
-    VerifiedUpgradeDeadlineDate
+    VerifiedUpgradeDeadlineDate,
+    CertificateAvailableDate
 )
 from courseware.model_data import FieldDataCache
 from courseware.module_render import get_module
@@ -367,6 +368,7 @@ def get_course_date_blocks(course, user):
     sorted by date.
     """
     block_classes = (
+        CertificateAvailableDate,
         CourseEndDate,
         CourseStartDate,
         TodaysDate,

lms/djangoapps/courseware/date_summary.py

@@ -16,6 +16,7 @@ from pytz import timezone, utc
 from course_modes.models import CourseMode
 from lms.djangoapps.commerce.utils import EcommerceService
 from lms.djangoapps.verify_student.models import SoftwareSecurePhotoVerification, VerificationDeadline
+from openedx.core.djangoapps.certificates.config import waffle
 from student.models import CourseEnrollment
 
 
@@ -195,6 +196,28 @@ class CourseEndDate(DateSummary):
         return self.course.end
 
 
+class CertificateAvailableDate(DateSummary):
+    """
+        Displays the end date of the course.
+        """
+    css_class = 'certificate-available-date'
+    title = ugettext_lazy('Certificate Available')
+
+    @property
+    def is_enabled(self):
+        return self.date is not None and datetime.datetime.now(utc) <= self.date and waffle.waffle().is_enabled(
+            waffle.INSTRUCTOR_PACED_ONLY
+        )
+
+    @property
+    def description(self):
+        return _('Day certificates will become available for passing verified learners.')
+
+    @property
+    def date(self):
+        return self.course.certificate_available_date
+
+
 class VerifiedUpgradeDeadlineDate(DateSummary):
     """
     Displays the date before which learners must upgrade to the

lms/djangoapps/courseware/tests/test_date_summary.py

@@ -18,7 +18,8 @@ from courseware.date_summary import (
     CourseStartDate,
     TodaysDate,
     VerificationDeadlineDate,
-    VerifiedUpgradeDeadlineDate
+    VerifiedUpgradeDeadlineDate,
+    CertificateAvailableDate
 )
 from courseware.models import DynamicUpgradeDeadlineConfiguration, CourseDynamicUpgradeDeadlineConfiguration
 from lms.djangoapps.verify_student.models import VerificationDeadline
@@ -351,6 +352,31 @@ class CourseDateSummaryTest(SharedModuleStoreTestCase):
         block = VerifiedUpgradeDeadlineDate(course, user)
         self.assertEqual(block.link, '{}?sku={}'.format(configuration.MULTIPLE_ITEMS_BASKET_PAGE_URL, sku))
 
+    ## CertificateAvailableDate
+    @waffle.testutils.override_switch('certificates.instructor_paced_only', True)
+    def test_no_certificate_available_date(self):
+        course = self.create_course_run(days_till_start=-1)
+        user = self.create_user()
+        CourseEnrollmentFactory(course_id=course.id, user=user, mode=CourseMode.AUDIT)
+        block = CertificateAvailableDate(course, user)
+        self.assertEqual(block.date, None)
+        self.assertFalse(block.is_enabled)
+
+    @waffle.testutils.override_switch('certificates.instructor_paced_only', True)
+    def test_certificate_available_date_defined(self):
+        course = self.create_course_run()
+        audit_user = self.create_user()
+        CourseEnrollmentFactory(course_id=course.id, user=audit_user, mode=CourseMode.AUDIT)
+        verified_user = self.create_user()
+        CourseEnrollmentFactory(course_id=course.id, user=verified_user, mode=CourseMode.VERIFIED)
+        course.certificate_available_date = datetime.now(utc) + timedelta(days=7)
+        course.save()
+        CertificateAvailableDate(course, audit_user)
+        for block in (CertificateAvailableDate(course, audit_user), CertificateAvailableDate(course, verified_user)):
+            self.assertIsNotNone(course.certificate_available_date)
+            self.assertEqual(block.date, course.certificate_available_date)
+            self.assertTrue(block.is_enabled)
+
     ## VerificationDeadlineDate
     def test_no_verification_deadline(self):
         course = self.create_course_run(days_till_start=-1, days_till_verification_deadline=None)