diff --git a/backend/tests/test_webhook_dispatch.py b/backend/tests/test_webhook_dispatch.py
index 1f741f7b..61383bc7 100644
--- a/backend/tests/test_webhook_dispatch.py
+++ b/backend/tests/test_webhook_dispatch.py
@@ -1,13 +1,14 @@
 # ruff: noqa: INP001
-"""Webhook queue helper unit tests."""
+"""Webhook queue and dispatch worker tests."""
 
 from __future__ import annotations
 
 from datetime import UTC, datetime
-from uuid import uuid4
+from uuid import UUID, uuid4
 
 import pytest
 
+from app.services.webhooks import dispatch
 from app.services.webhooks.queue import (
     QueuedWebhookDelivery,
     dequeue_webhook_delivery,
@@ -86,3 +87,115 @@ def test_requeue_respects_retry_cap(monkeypatch: pytest.MonkeyPatch, attempts: i
         requeued = dequeue_webhook_delivery()
         assert requeued is not None
         assert requeued.attempts == attempts + 1
+
+
+class _FakeQueuedItem:
+    def __init__(self, attempts: int = 0) -> None:
+        self.payload_id = uuid4()
+        self.webhook_id = uuid4()
+        self.board_id = uuid4()
+        self.attempts = attempts
+
+
+def _patch_dequeue(monkeypatch: pytest.MonkeyPatch, items: list[QueuedWebhookDelivery | None]) -> None:
+    def _dequeue() -> QueuedWebhookDelivery | None:
+        if not items:
+            return None
+        return items.pop(0)
+
+    monkeypatch.setattr(dispatch, "dequeue_webhook_delivery", _dequeue)
+
+
+@pytest.mark.asyncio
+async def test_dispatch_flush_processes_items_and_throttles(monkeypatch: pytest.MonkeyPatch) -> None:
+    items: list[QueuedWebhookDelivery | None] = [
+        _FakeQueuedItem(),
+        _FakeQueuedItem(),
+        None,
+    ]
+    _patch_dequeue(monkeypatch, items)
+
+    processed: list[UUID] = []
+    throttles: list[float] = []
+
+    async def _process(item: QueuedWebhookDelivery) -> None:
+        processed.append(item.payload_id)
+
+    monkeypatch.setattr(dispatch, "_process_single_item", _process)
+    monkeypatch.setattr(dispatch.settings, "webhook_dispatch_throttle_seconds", 0)
+    monkeypatch.setattr(dispatch.time, "sleep", lambda seconds: throttles.append(seconds))
+
+    await dispatch.flush_webhook_delivery_queue()
+
+    assert len(processed) == 2
+    assert throttles == [0.0, 0.0]
+
+
+@pytest.mark.asyncio
+async def test_dispatch_flush_requeues_on_process_error(monkeypatch: pytest.MonkeyPatch) -> None:
+    item = _FakeQueuedItem()
+    _patch_dequeue(monkeypatch, [item, None])
+
+    async def _process(_: QueuedWebhookDelivery) -> None:
+        raise RuntimeError("boom")
+
+    requeued: list[QueuedWebhookDelivery] = []
+
+    def _requeue(payload: QueuedWebhookDelivery) -> bool:
+        requeued.append(payload)
+        return True
+
+    monkeypatch.setattr(dispatch, "_process_single_item", _process)
+    monkeypatch.setattr(dispatch, "requeue_if_failed", _requeue)
+    monkeypatch.setattr(dispatch.settings, "webhook_dispatch_throttle_seconds", 0)
+    monkeypatch.setattr(dispatch.time, "sleep", lambda seconds: None)
+
+    await dispatch.flush_webhook_delivery_queue()
+
+    assert len(requeued) == 1
+    assert requeued[0].payload_id == item.payload_id
+
+
+@pytest.mark.asyncio
+async def test_dispatch_flush_recovers_from_dequeue_error(monkeypatch: pytest.MonkeyPatch) -> None:
+    item = _FakeQueuedItem()
+    call_count = 0
+
+    def _dequeue() -> QueuedWebhookDelivery | None:
+        nonlocal call_count
+        call_count += 1
+        if call_count == 1:
+            raise RuntimeError("dequeue broken")
+        if call_count == 2:
+            return item
+        return None
+
+    monkeypatch.setattr(dispatch, "dequeue_webhook_delivery", _dequeue)
+
+    processed = 0
+
+    async def _process(_: QueuedWebhookDelivery) -> None:
+        nonlocal processed
+        processed += 1
+
+    monkeypatch.setattr(dispatch, "_process_single_item", _process)
+    monkeypatch.setattr(dispatch.settings, "webhook_dispatch_throttle_seconds", 0)
+    monkeypatch.setattr(dispatch.time, "sleep", lambda seconds: None)
+
+    await dispatch.flush_webhook_delivery_queue()
+
+    assert call_count == 3
+    assert processed == 1
+
+
+def test_dispatch_run_entrypoint_calls_async_flush(monkeypatch: pytest.MonkeyPatch) -> None:
+    called: list[bool] = []
+
+    async def _flush() -> None:
+        called.append(True)
+
+    monkeypatch.setattr(dispatch, "flush_webhook_delivery_queue", _flush)
+
+    dispatch.run_flush_webhook_delivery_queue()
+
+    assert called == [True]