diff --git a/noxfile.py b/noxfile.py
index ba16d5a46..e9fea8af8 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -146,9 +146,6 @@ def default(session):
     session.install("-e", ".", "-c", constraints_path)
 
     # Run py.test against the unit tests.
-    # THe following flags are useful during development:
-    # "-s" -> show print() statement output
-    # "-k <test case prefix>" -> filter test cases
     session.run(
         "py.test",
         "--quiet",
@@ -159,7 +156,6 @@ def default(session):
         "--cov-config=.coveragerc",
         "--cov-report=",
         "--cov-fail-under=0",
-        "-s",
         os.path.join("tests", "unit"),
         *session.posargs,
     )
@@ -204,9 +200,6 @@ def system(session):
     session.install("-e", ".", "-c", constraints_path)
 
     # Run py.test against the system tests.
-    # THe following flags are useful during development:
-    # "-s" -> show print() statement output
-    # "-k <test case prefix>" -> filter test cases
     if system_test_exists:
         session.run(
             "py.test",
@@ -233,8 +226,7 @@ def cover(session):
     test runs (not system test runs), and then erases coverage data.
     """
     session.install("coverage", "pytest-cov")
-    # Tip: The "-i" flag lets you ignore errors with specific files.
-    session.run("coverage", "report", "-i", "--show-missing", "--fail-under=100")
+    session.run("coverage", "report", "--show-missing", "--fail-under=100")
 
     session.run("coverage", "erase")
 
diff --git a/samples/snippets/subscriber.py b/samples/snippets/subscriber.py
index ada70a02d..5a9d0a7a5 100644
--- a/samples/snippets/subscriber.py
+++ b/samples/snippets/subscriber.py
@@ -242,6 +242,37 @@ def create_subscription_with_filtering(
     # [END pubsub_create_subscription_with_filter]
 
 
+def create_subscription_with_exactly_once_delivery(
+    project_id: str, topic_id: str, subscription_id: str
+) -> None:
+    """Create a subscription with exactly once delivery enabled."""
+    # [START pubsub_create_subscription_with_exactly_once_delivery]
+    from google.cloud import pubsub_v1
+
+    # TODO(developer): Choose an existing topic.
+    # project_id = "your-project-id"
+    # topic_id = "your-topic-id"
+    # subscription_id = "your-subscription-id"
+
+    publisher = pubsub_v1.PublisherClient()
+    subscriber = pubsub_v1.SubscriberClient()
+    topic_path = publisher.topic_path(project_id, topic_id)
+    subscription_path = subscriber.subscription_path(project_id, subscription_id)
+
+    with subscriber:
+        subscription = subscriber.create_subscription(
+            request={
+                "name": subscription_path,
+                "topic": topic_path,
+                "enable_exactly_once_delivery": True,
+            }
+        )
+        print(
+            f"Created subscription with exactly once delivery enabled: {subscription}"
+        )
+    # [END pubsub_create_subscription_with_exactly_once_delivery]
+
+
 def delete_subscription(project_id: str, subscription_id: str) -> None:
     """Deletes an existing Pub/Sub topic."""
     # [START pubsub_delete_subscription]
@@ -879,6 +910,15 @@ def callback(message: pubsub_v1.subscriber.message.Message) -> None:
     create_subscription_with_filtering_parser.add_argument("subscription_id")
     create_subscription_with_filtering_parser.add_argument("filter")
 
+    create_subscription_with_exactly_once_delivery_parser = subparsers.add_parser(
+        "create-with-exactly-once",
+        help=create_subscription_with_exactly_once_delivery.__doc__,
+    )
+    create_subscription_with_exactly_once_delivery_parser.add_argument("topic_id")
+    create_subscription_with_exactly_once_delivery_parser.add_argument(
+        "subscription_id"
+    )
+
     delete_parser = subparsers.add_parser("delete", help=delete_subscription.__doc__)
     delete_parser.add_argument("subscription_id")
 
@@ -1003,6 +1043,10 @@ def callback(message: pubsub_v1.subscriber.message.Message) -> None:
         create_subscription_with_filtering(
             args.project_id, args.topic_id, args.subscription_id, args.filter
         )
+    elif args.command == "create-with-exactly-once":
+        create_subscription_with_exactly_once_delivery(
+            args.project_id, args.topic_id, args.subscription_id
+        )
     elif args.command == "delete":
         delete_subscription(args.project_id, args.subscription_id)
     elif args.command == "update-push":
diff --git a/samples/snippets/subscriber_test.py b/samples/snippets/subscriber_test.py
index 614633664..34a42cac4 100644
--- a/samples/snippets/subscriber_test.py
+++ b/samples/snippets/subscriber_test.py
@@ -411,6 +411,31 @@ def test_create_subscription_with_filtering(
     assert '"attributes.author=\\"unknown\\""' in out
 
 
+def test_create_subscription_with_exactly_once_delivery(
+    subscriber_client: pubsub_v1.SubscriberClient,
+    subscription_admin: str,
+    capsys: CaptureFixture[str],
+) -> None:
+    subscription_path = subscriber_client.subscription_path(
+        PROJECT_ID, SUBSCRIPTION_ADMIN
+    )
+    try:
+        subscriber_client.delete_subscription(
+            request={"subscription": subscription_path}
+        )
+    except NotFound:
+        pass
+
+    subscriber.create_subscription_with_exactly_once_delivery(
+        PROJECT_ID, TOPIC, SUBSCRIPTION_ADMIN
+    )
+
+    out, _ = capsys.readouterr()
+    assert "Created subscription with exactly once delivery enabled" in out
+    assert f"{subscription_admin}" in out
+    assert "enable_exactly_once_delivery: true" in out
+
+
 def test_create_push_subscription(
     subscriber_client: pubsub_v1.SubscriberClient,
     subscription_admin: str,