diff --git a/services/insta-render/pytest.ini b/services/insta-render/pytest.ini
new file mode 100644
index 0000000..2f4c80e
--- /dev/null
+++ b/services/insta-render/pytest.ini
@@ -0,0 +1,2 @@
+[pytest]
+asyncio_mode = auto
diff --git a/services/insta-render/tests/.gitkeep b/services/insta-render/tests/.gitkeep
deleted file mode 100644
index e69de29..0000000
diff --git a/services/insta-render/tests/test_worker.py b/services/insta-render/tests/test_worker.py
new file mode 100644
index 0000000..1fa4a26
--- /dev/null
+++ b/services/insta-render/tests/test_worker.py
@@ -0,0 +1,122 @@
+"""worker.py — Redis BLPOP + webhook 단위 테스트."""
+import json
+import pytest
+import httpx
+from unittest.mock import AsyncMock, patch
+
+import worker
+
+
+@pytest.fixture
+def fake_slate():
+    return {
+        "id": 42,
+        "cover_copy": json.dumps({"headline": "테스트 H", "body": "테스트 B", "accent_color": "#FF0000"}),
+        "body_copies": json.dumps([{"headline": "본문1", "body": "..."} for _ in range(8)]),
+        "cta_copy": json.dumps({"headline": "CTA", "body": "...", "cta": "Click"}),
+    }
+
+
+@pytest.mark.asyncio
+async def test_post_update_sends_correct_payload(monkeypatch):
+    monkeypatch.setenv("INTERNAL_API_KEY", "test-secret")
+    monkeypatch.setenv("NAS_BASE_URL", "http://nas.test")
+    # worker 모듈 환경변수 재로딩
+    worker.NAS_BASE_URL = "http://nas.test"
+    worker.INTERNAL_API_KEY = "test-secret"
+
+    captured = {}
+    async def fake_post(self, url, headers=None, json=None, **kw):
+        captured["url"] = url
+        captured["headers"] = headers
+        captured["json"] = json
+        class R:
+            status_code = 200
+            text = "ok"
+        return R()
+    monkeypatch.setattr(httpx.AsyncClient, "post", fake_post)
+
+    async with httpx.AsyncClient() as client:
+        await worker._post_update(client, "t-1", "processing", 30)
+
+    assert captured["url"] == "http://nas.test/api/internal/insta/update"
+    assert captured["headers"]["X-Internal-Key"] == "test-secret"
+    assert captured["json"]["status"] == "processing"
+    assert captured["json"]["progress"] == 30
+
+
+@pytest.mark.asyncio
+async def test_process_one_success_calls_webhook_twice(monkeypatch, fake_slate):
+    """processing(50) → succeeded(100) 두 번 호출 + render 한 번."""
+    calls: list = []
+
+    async def fake_post(self, url, headers=None, json=None, **kw):
+        calls.append({"status": json["status"], "progress": json["progress"]})
+        class R:
+            status_code = 200
+            text = "ok"
+        return R()
+
+    async def fake_get(self, url, **kw):
+        class R:
+            status_code = 200
+            def json(self_inner): return fake_slate
+            def raise_for_status(self_inner): pass
+        return R()
+
+    async def fake_render(slate, slate_id, template="default/card.html.j2"):
+        return [f"/tmp/{slate_id}/{i:02d}.png" for i in range(1, 11)]
+
+    monkeypatch.setattr(httpx.AsyncClient, "post", fake_post)
+    monkeypatch.setattr(httpx.AsyncClient, "get", fake_get)
+    monkeypatch.setattr(worker, "render_slate", fake_render)
+    worker.INTERNAL_API_KEY = "test"
+    worker.NAS_BASE_URL = "http://nas.test"
+
+    async with httpx.AsyncClient() as client:
+        await worker._process_one(client, {
+            "task_id": "t-2",
+            "params": {"slate_id": 42, "theme": "default"},
+        })
+
+    statuses = [c["status"] for c in calls]
+    assert "processing" in statuses
+    assert "succeeded" in statuses
+    assert calls[-1]["progress"] == 100
+
+
+@pytest.mark.asyncio
+async def test_process_one_render_failure_reports_failed(monkeypatch, fake_slate):
+    """render 예외 시 failed webhook 호출."""
+    calls: list = []
+
+    async def fake_post(self, url, headers=None, json=None, **kw):
+        calls.append(json)
+        class R: status_code = 200; text = "ok"
+        return R()
+
+    async def fake_get(self, url, **kw):
+        class R:
+            status_code = 200
+            def json(self_inner): return fake_slate
+            def raise_for_status(self_inner): pass
+        return R()
+
+    async def fake_render(*a, **k):
+        raise RuntimeError("Chromium crashed")
+
+    monkeypatch.setattr(httpx.AsyncClient, "post", fake_post)
+    monkeypatch.setattr(httpx.AsyncClient, "get", fake_get)
+    monkeypatch.setattr(worker, "render_slate", fake_render)
+    worker.INTERNAL_API_KEY = "test"
+    worker.NAS_BASE_URL = "http://nas.test"
+
+    async with httpx.AsyncClient() as client:
+        await worker._process_one(client, {
+            "task_id": "t-3",
+            "params": {"slate_id": 99},
+        })
+
+    last = calls[-1]
+    assert last["status"] == "failed"
+    assert "Chromium" in last["error"]