diff --git a/tests/integration/services/test_restart_helper.py b/tests/integration/services/test_restart_helper.py
index a3f6eb2ef..104028e02 100644
--- a/tests/integration/services/test_restart_helper.py
+++ b/tests/integration/services/test_restart_helper.py
@@ -12,15 +12,18 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
+import time
 from unittest import mock
 
 import pytest
+from django_rq import get_scheduler
 
 from aap_eda.core import models
 from aap_eda.core.enums import ActivationRequest, ProcessParentType
 from aap_eda.services.activation.restart_helper import (
     _queue_auto_start,
     auto_start_job_id,
+    system_cancel_restart_activation,
     system_restart_activation,
 )
 
@@ -40,6 +43,33 @@ def activation():
     )
 
 
+@pytest.mark.django_db
+def test_system_cancel_restart_activation(activation):
+    job_id = auto_start_job_id(ProcessParentType.ACTIVATION, activation.id)
+
+    scheduler = get_scheduler(name="default")
+
+    delay = 5
+    system_restart_activation(
+        ProcessParentType.ACTIVATION, activation.id, delay
+    )
+
+    # Sleep for half the delay and verify the job is still in the scheduler.
+    time.sleep(delay / 2)
+    assert job_id in scheduler
+
+    # Cancel the job and verify that it's not in the scheduler.
+    system_cancel_restart_activation(
+        ProcessParentType.ACTIVATION, activation.id
+    )
+    assert job_id not in scheduler
+
+    # Sleep for half the delay and verify the job didn't somehow run; i.e., we
+    # really canceled it.
+    time.sleep(delay / 2)
+    assert models.ActivationRequestQueue.objects.count() == 0
+
+
 @pytest.mark.django_db
 @mock.patch("aap_eda.services.activation.restart_helper.enqueue_delay")
 def test_system_restart_activation(enqueue_mock, activation):
diff --git a/tests/integration/tasks/test_activation_request_queue.py b/tests/integration/tasks/test_activation_request_queue.py
index 8e6b7a681..3d3bbd56d 100644
--- a/tests/integration/tasks/test_activation_request_queue.py
+++ b/tests/integration/tasks/test_activation_request_queue.py
@@ -13,10 +13,12 @@
 #  limitations under the License.
 
 import pytest
+from django.db.utils import IntegrityError
 
 import aap_eda.tasks.activation_request_queue as queue
 from aap_eda.core import models
 from aap_eda.core.enums import ActivationRequest, ProcessParentType
+from aap_eda.tasks.exceptions import UnknownProcessParentType
 
 
 @pytest.fixture()
@@ -76,6 +78,28 @@ def test_queue(activations):
     )
 
 
+@pytest.mark.django_db
+def test_queue_push_exceptions():
+    parent_type = "unknown"
+    parent_id = 1
+
+    with pytest.raises(UnknownProcessParentType) as info:
+        queue.push(parent_type, parent_id, ActivationRequest.AUTO_START)
+    assert str(info.value) == f"Unknown parent type {parent_type}"
+
+    with pytest.raises(IntegrityError) as info:
+        queue.push(
+            ProcessParentType.ACTIVATION,
+            parent_id,
+            ActivationRequest.AUTO_START,
+        )
+    assert (
+        str(info.value)
+        == f"{ProcessParentType.ACTIVATION} {parent_id} no longer exists, "
+        f"{ActivationRequest.AUTO_START} request will not be processed"
+    )
+
+
 @pytest.mark.parametrize(
     "requests",
     [