Add schedule smoke test routine

tests/test_schedule_lifecycle.py

@@ -13,6 +13,7 @@ from __future__ import annotations
 
 import asyncio
 import uuid
+from datetime import datetime, timedelta, timezone
 
 import pytest
 from temporalio.client import ScheduleOverlapPolicy
@@ -21,8 +22,11 @@ from temporalio.testing import WorkflowEnvironment
 from activity_core.models import ActivityDefinition, CronTriggerConfig
 from activity_core.schedule_manager import (
     delete_schedule,
+    delete_smoke_test_schedule,
     list_schedules,
     schedule_id,
+    schedule_smoke_test,
+    smoke_schedule_id,
     upsert_schedule,
 )
 
@@ -180,3 +184,30 @@ async def test_misfire_policy_compress_sets_overlap_buffer_one(env: WorkflowEnvi
     assert desc.schedule.policy.overlap == ScheduleOverlapPolicy.BUFFER_ONE
 
     await delete_schedule(env.client, defn.id)
+
+
+@pytest.mark.asyncio
+async def test_schedule_smoke_test_creates_one_shot_schedule(
+    env: WorkflowEnvironment,
+) -> None:
+    defn = _make_defn()
+    fire_base = datetime(2026, 6, 6, 12, 0, tzinfo=timezone.utc)
+
+    sid, workflow_id, fire_at = await schedule_smoke_test(
+        env.client,
+        defn,
+        delay=timedelta(minutes=1),
+        now=fire_base,
+    )
+
+    assert sid == smoke_schedule_id(defn.id)
+    assert workflow_id == f"activity-{defn.id}:smoke-20260606T120100Z"
+    assert fire_at == datetime(2026, 6, 6, 12, 1, tzinfo=timezone.utc)
+
+    handle = env.client.get_schedule_handle(sid)
+    desc = await handle.describe()
+    assert desc.schedule.state.limited_actions is True
+    assert desc.schedule.state.remaining_actions == 1
+    assert desc.schedule.spec.time_zone_name == "UTC"
+
+    await delete_smoke_test_schedule(env.client, defn.id)