diff --git a/src/olympia/abuse/tests/test_models.py b/src/olympia/abuse/tests/test_models.py
index 68ff5f968e98..6dcde087b259 100644
--- a/src/olympia/abuse/tests/test_models.py
+++ b/src/olympia/abuse/tests/test_models.py
@@ -1,6 +1,6 @@
 import json
 import uuid
-from datetime import datetime
+from datetime import datetime, timedelta
 from unittest import mock
 
 from django.conf import settings
@@ -2835,6 +2835,42 @@ def test_execute_action_reject_version_delayed_rejection(self):
         assert 'some review text' in mail.outbox[0].body
         assert '14 day(s)' in mail.outbox[0].body
 
+    def test_execute_action_change_pending_rejection_date(self):
+        addon = addon_factory(users=[user_factory(email='author@example.com')])
+        old_pending_rejection = self.days_ago(1)
+        new_pending_rejection = datetime.now() + timedelta(days=1)
+        version_review_flags_factory(
+            version=addon.current_version,
+            pending_rejection=old_pending_rejection,
+            pending_rejection_by=user_factory(),
+            pending_content_rejection=False,
+        )
+        decision = ContentDecision.objects.create(
+            addon=addon,
+            action=DECISION_ACTIONS.AMO_CHANGE_PENDING_REJECTION_DATE,
+            action_date=datetime.now(),
+        )
+        ActivityLog.objects.create(
+            amo.LOG.CHANGE_PENDING_REJECTION,
+            addon,
+            addon.current_version,
+            decision,
+            details={
+                'old_deadline': str(old_pending_rejection),
+                'new_deadline': str(new_pending_rejection),
+            },
+            user=user_factory(),
+        )
+        decision.execute_action_and_notify()
+        assert (
+            'previous correspondence indicated that you would be required '
+            f'to correct the violation(s) by {old_pending_rejection}'
+        ) in mail.outbox[0].body
+        assert (
+            'now require you to correct your add-on violations no later '
+            f'than {new_pending_rejection}'
+        ) in mail.outbox[0].body
+
     def test_resolve_job_forwarded(self):
         addon_developer = user_factory()
         addon = addon_factory(users=[addon_developer])
diff --git a/src/olympia/reviewers/tests/test_forms.py b/src/olympia/reviewers/tests/test_forms.py
index 37c34781ac1e..e055858dd404 100644
--- a/src/olympia/reviewers/tests/test_forms.py
+++ b/src/olympia/reviewers/tests/test_forms.py
@@ -1092,9 +1092,7 @@ def test_delayable_action_missing_fields(self):
         }
         form = self.get_form(data=data)
         assert not form.is_valid()
-        assert form.errors['delayed_rejection'] == [
-            'This field is required.'
-        ]
+        assert form.errors['delayed_rejection'] == ['This field is required.']
 
         # 'False' or '' works, we just want to ensure the field was submitted.
         form = self.get_form(data=data)
@@ -1109,9 +1107,7 @@ def test_delayable_action_missing_fields(self):
         data['delayed_rejection_date'] = ''
         form = self.get_form(data=data)
         assert not form.is_valid()
-        assert form.errors['delayed_rejection_date'] == [
-            'This field is required.'
-        ]
+        assert form.errors['delayed_rejection_date'] == ['This field is required.']
 
     def test_version_pk(self):
         self.grant_permission(self.request.user, 'Addons:Review')
diff --git a/src/olympia/reviewers/tests/test_views.py b/src/olympia/reviewers/tests/test_views.py
index 63dcdca5d32a..8f3c2fa74890 100644
--- a/src/olympia/reviewers/tests/test_views.py
+++ b/src/olympia/reviewers/tests/test_views.py
@@ -4613,8 +4613,7 @@ def test_reject_multiple_versions_with_delay(self):
         self.grant_permission(self.reviewer, 'Addons:Review,Reviews:Admin')
 
         in_the_future = datetime.now() + timedelta(
-            days=REVIEWER_DELAYED_REJECTION_PERIOD_DAYS_DEFAULT,
-            hours=1
+            days=REVIEWER_DELAYED_REJECTION_PERIOD_DAYS_DEFAULT, hours=1
         )
 
         response = self.client.post(
@@ -5252,12 +5251,23 @@ def test_test_data_value_attributes_admin(self):
 
         assert doc('.data-toggle.review-actions-reasons')[0].attrib['data-value'].split(
             ' '
-        ) == ['reject_multiple_versions', 'reply', 'disable_addon',]
+        ) == [
+            'reject_multiple_versions',
+            'reply',
+            'disable_addon',
+        ]
 
-        assert doc('.data-toggle.review-files')[0].attrib['data-value'] == 'disable_addon'
-        assert doc('.data-toggle.review-tested')[0].attrib['data-value'] == 'disable_addon'
+        assert (
+            doc('.data-toggle.review-files')[0].attrib['data-value'] == 'disable_addon'
+        )
+        assert (
+            doc('.data-toggle.review-tested')[0].attrib['data-value'] == 'disable_addon'
+        )
         # Admins can use delayed rejections
-        assert doc('.data-toggle.review-delayed-rejection')[0].attrib['data-value'] == 'reject_multiple_versions change_pending_rejection_multiple_versions'
+        assert (
+            doc('.data-toggle.review-delayed-rejection')[0].attrib['data-value']
+            == 'reject_multiple_versions change_pending_rejection_multiple_versions'
+        )
 
     def test_data_value_attributes_unlisted(self):
         self.version.update(channel=amo.CHANNEL_UNLISTED)