diff --git a/music-lab/tests/test_pipeline_flow.py b/music-lab/tests/test_pipeline_flow.py
new file mode 100644
index 0000000..4e6c910
--- /dev/null
+++ b/music-lab/tests/test_pipeline_flow.py
@@ -0,0 +1,113 @@
+"""풀 파이프라인 happy-path 통합 테스트 — 모든 외부 호출 mock."""
+import pytest
+import sqlite3
+from unittest.mock import AsyncMock, patch
+from fastapi.testclient import TestClient
+from app.main import app
+from app import db
+
+
+@pytest.fixture
+def client(monkeypatch, tmp_path):
+    monkeypatch.setattr(db, "DB_PATH", str(tmp_path / "music.db"))
+    db.init_db()
+    # 기본 트랙 1개 등록 (music_library 테이블)
+    conn = sqlite3.connect(db.DB_PATH)
+    cur = conn.cursor()
+    try:
+        cur.execute(
+            """INSERT INTO music_library
+               (id, title, genre, moods, instruments, duration_sec, bpm, key, scale,
+                prompt, audio_url, file_path, task_id, tags)
+               VALUES (1, 'Integration Test', 'lo-fi', '["chill"]', '["piano"]',
+                       120, 85, 'C', 'maj', 'p',
+                       '/media/music/x.mp3', '/app/data/music/x.mp3', NULL, '[]')""",
+        )
+        conn.commit()
+    except sqlite3.OperationalError as e:
+        # 스키마가 다르면 테스트 스킵 가이드 표시
+        pytest.skip(f"music_library schema mismatch: {e}")
+    conn.close()
+    return TestClient(app)
+
+
+# `new=...`로 patch한 항목은 mock 인자를 함수에 주입하지 않음.
+# return_value로 patch한 두 개(cover/video는 new=AsyncMock 사용 → 미주입,
+# thumb/video는 return_value → 주입, youtube.upload_video도 return_value → 주입).
+# 데코레이터는 아래에서 위 순서로 인자에 주입됨:
+#   1) cover (new=AsyncMock)        → 미주입
+#   2) video (return_value)         → 주입 → mock_video
+#   3) thumb (return_value)         → 주입 → mock_thumb
+#   4) metadata (new=AsyncMock)     → 미주입
+#   5) review (new=AsyncMock)       → 미주입
+#   6) youtube.upload_video (return_value) → 주입 → mock_yt
+@patch("app.pipeline.youtube.upload_video", return_value={"video_id": "VID999"})
+@patch("app.pipeline.review.run_4_axis", new=AsyncMock(return_value={
+    "metadata_quality": {"score": 80, "notes": "ok"},
+    "policy_compliance": {"score": 90, "issues": []},
+    "viewer_experience": {"score": 80, "notes": "ok"},
+    "trend_alignment": {"score": 70, "matched_keywords": ["lofi"]},
+    "weighted_total": 80.0, "verdict": "pass", "summary": "good", "used_fallback": False,
+}))
+@patch("app.pipeline.metadata.generate", new=AsyncMock(return_value={
+    "title": "Integration Test", "description": "Test desc",
+    "tags": ["lofi"], "category_id": 10, "used_fallback": False, "error": None,
+}))
+@patch("app.pipeline.thumb.generate", return_value={
+    "url": "/media/videos/1/thumbnail.jpg", "used_fallback": False,
+})
+@patch("app.pipeline.video.generate", return_value={
+    "url": "/media/videos/1/video.mp4", "used_fallback": False, "duration_sec": 120,
+})
+@patch("app.pipeline.cover.generate", new=AsyncMock(return_value={
+    "url": "/media/videos/1/cover.jpg", "used_fallback": False, "error": None,
+}))
+def test_full_pipeline_happy_path(mock_video, mock_thumb, mock_yt, client):
+    # 1. 파이프라인 생성
+    pid = client.post("/api/music/pipeline", json={"track_id": 1}).json()["id"]
+    assert db.get_pipeline(pid)["state"] == "created"
+
+    # 2. 시작 → cover 자동 생성 → cover_pending
+    r = client.post(f"/api/music/pipeline/{pid}/start")
+    assert r.status_code == 202
+    assert db.get_pipeline(pid)["state"] == "cover_pending"
+
+    # 3. 4단계 사용자 승인 (cover, video, thumb, meta)
+    for step in ["cover", "video", "thumb", "meta"]:
+        r = client.post(f"/api/music/pipeline/{pid}/feedback",
+                        json={"step": step, "intent": "approve"})
+        assert r.status_code == 202
+
+    # 4. ai_review 자동 진행 후 publish_pending
+    p = db.get_pipeline(pid)
+    assert p["state"] == "publish_pending"
+    assert p["review"]["verdict"] == "pass"
+
+    # 5. 발행 트리거
+    r = client.post(f"/api/music/pipeline/{pid}/publish")
+    assert r.status_code == 202
+
+    # 6. 최종 published
+    p = db.get_pipeline(pid)
+    assert p["state"] == "published"
+    assert p["youtube_video_id"] == "VID999"
+
+
+# cover.generate는 new=AsyncMock이므로 함수 인자에 주입되지 않음.
+@patch("app.pipeline.cover.generate", new=AsyncMock(return_value={
+    "url": "/media/videos/2/cover.jpg", "used_fallback": False, "error": None,
+}))
+def test_pipeline_reject_and_regenerate(client):
+    pid = client.post("/api/music/pipeline", json={"track_id": 1}).json()["id"]
+    client.post(f"/api/music/pipeline/{pid}/start")
+    assert db.get_pipeline(pid)["state"] == "cover_pending"
+
+    # 반려 + 피드백 → 같은 단계 재진입
+    r = client.post(f"/api/music/pipeline/{pid}/feedback",
+                    json={"step": "cover", "intent": "reject", "feedback_text": "더 어둡게"})
+    assert r.status_code == 202
+    p = db.get_pipeline(pid)
+    assert p["state"] == "cover_pending"  # 같은 단계 유지
+    assert p["feedback_count_per_step"]["cover"] == 1
+    history = db.get_feedback_history(pid)
+    assert history[0]["feedback_text"] == "더 어둡게"