feat(music-lab): video_producer — FFmpeg 비주얼라이저·슬라이드쇼 + Claude 메타데이터

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

music-lab/tests/test_video_producer.py

@@ -0,0 +1,98 @@
+# music-lab/tests/test_video_producer.py
+import os
+from unittest.mock import patch, MagicMock
+import pytest
+
+
+def test_build_visualizer_cmd():
+    from app.video_producer import _build_visualizer_cmd
+    cmd = _build_visualizer_cmd(
+        audio_path="/data/music/test.mp3",
+        bg_path="/tmp/bg.jpg",
+        output_path="/data/videos/1/output.mp4",
+    )
+    assert cmd[0] == "ffmpeg"
+    assert "/data/music/test.mp3" in cmd
+    assert "/data/videos/1/output.mp4" in cmd
+    assert any("showwaves" in str(c) for c in cmd)
+
+
+def test_make_gradient_bg_uses_pillow(tmp_path):
+    from app.video_producer import _make_gradient_bg
+    out = str(tmp_path / "bg.jpg")
+    _make_gradient_bg(1920, 1080, "lo-fi", out)
+    assert os.path.exists(out)
+    assert os.path.getsize(out) > 0
+
+
+def test_extract_thumbnail_cmd():
+    from app.video_producer import _build_thumbnail_cmd
+    cmd = _build_thumbnail_cmd("/data/videos/1/output.mp4", "/data/videos/1/thumbnail.jpg")
+    assert cmd[0] == "ffmpeg"
+    assert "00:00:05" in cmd
+    assert "/data/videos/1/thumbnail.jpg" in cmd
+
+
+def test_build_slideshow_cmd_single_image():
+    from app.video_producer import _build_slideshow_cmd
+    cmd = _build_slideshow_cmd(
+        image_paths=["/tmp/img0.jpg"],
+        audio_path="/tmp/audio.mp3",
+        output_path="/tmp/out.mp4",
+        duration_per_image=30.0,
+    )
+    assert "ffmpeg" in cmd[0]
+    assert "/tmp/out.mp4" in cmd
+    assert any("copy" in str(c) for c in cmd)
+
+
+def test_build_slideshow_cmd_multiple_images():
+    from app.video_producer import _build_slideshow_cmd
+    cmd = _build_slideshow_cmd(
+        image_paths=["/tmp/img0.jpg", "/tmp/img1.jpg", "/tmp/img2.jpg"],
+        audio_path="/tmp/audio.mp3",
+        output_path="/tmp/out.mp4",
+        duration_per_image=60.0,
+    )
+    assert "ffmpeg" in cmd[0]
+    assert any("xfade" in str(c) for c in cmd)
+    assert "/tmp/out.mp4" in cmd
+
+
+def test_produce_video_visualizer_calls_ffmpeg(tmp_db, tmp_path):
+    """produce_video가 visualizer 포맷으로 FFmpeg를 호출하는지 확인."""
+    from app.db import init_db, create_video_project
+    import sqlite3
+
+    init_db()
+
+    # music_library에 직접 트랙 삽입
+    import app.db as db_mod
+    with db_mod._conn() as conn:
+        conn.execute(
+            """INSERT INTO music_library (title, genre, audio_url, file_path, provider)
+               VALUES (?, ?, ?, ?, ?)""",
+            ("Test Track", "lo-fi", "/media/music/test.mp3",
+             str(tmp_path / "test.mp3"), "suno"),
+        )
+
+    # 빈 mp3 파일 생성
+    (tmp_path / "test.mp3").write_bytes(b"\x00" * 100)
+
+    create_video_project({"track_id": 1, "format": "visualizer", "target_countries": ["BR"]})
+
+    import app.video_producer as vp
+    vp.VIDEO_DATA_DIR = str(tmp_path / "videos")
+
+    with patch("app.video_producer.subprocess.run") as mock_run, \
+         patch("app.video_producer._generate_metadata", return_value={
+             "yt_title": "Chill Beats", "yt_description": "desc", "yt_tags": ["lofi"]
+         }), \
+         patch("app.video_producer._download_url", return_value=False):
+        mock_run.return_value = MagicMock(returncode=0)
+        vp.produce_video(1)
+
+    from app.db import get_video_project
+    proj = get_video_project(1)
+    assert proj["status"] == "done"
+    assert mock_run.called