feat(music-lab): background.py — Pexels Video API + orchestrator video_loop 분기

music-lab/tests/test_background.py

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+import os
+import pytest
+import respx
+from httpx import Response
+from app.pipeline import background, storage
+
+
+@pytest.fixture
+def tmp_storage(monkeypatch, tmp_path):
+    monkeypatch.setattr(storage, "VIDEO_DATA_DIR", str(tmp_path))
+    return tmp_path
+
+
+@pytest.mark.asyncio
+@respx.mock
+async def test_fetch_video_loop_success(tmp_storage, monkeypatch):
+    monkeypatch.setenv("PEXELS_API_KEY", "k")
+    video_url = "https://videos.pexels.com/video-files/123/sample.mp4"
+    respx.get("https://api.pexels.com/videos/search").mock(
+        return_value=Response(200, json={
+            "videos": [{
+                "id": 123, "duration": 10,
+                "video_files": [
+                    {"quality": "hd", "width": 1920, "link": video_url},
+                ],
+            }],
+        })
+    )
+    respx.get(video_url).mock(return_value=Response(200, content=b"\x00" * 4096))
+
+    result = await background.fetch_video_loop(pipeline_id=10, keyword="rainy window")
+    assert result["used_fallback"] is False
+    assert (tmp_storage / "10" / "loop.mp4").exists()
+
+
+@pytest.mark.asyncio
+async def test_fetch_video_loop_no_api_key(tmp_storage, monkeypatch):
+    monkeypatch.delenv("PEXELS_API_KEY", raising=False)
+    result = await background.fetch_video_loop(pipeline_id=11, keyword="rain")
+    assert result["used_fallback"] is True
+
+
+@pytest.mark.asyncio
+@respx.mock
+async def test_fetch_video_loop_zero_results(tmp_storage, monkeypatch):
+    monkeypatch.setenv("PEXELS_API_KEY", "k")
+    respx.get("https://api.pexels.com/videos/search").mock(
+        return_value=Response(200, json={"videos": []})
+    )
+    result = await background.fetch_video_loop(pipeline_id=12, keyword="impossible-keyword")
+    assert result["used_fallback"] is True