Test API-wide media output validation

tests/test_output_validation.py

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+from __future__ import annotations
+
+from pathlib import Path
+
+import pytest
+
+from app.container import build_container
+from app.core.exceptions import ProcessingError
+from app.models.media import OperationResult
+
+
+@pytest.mark.asyncio
+async def test_output_validation_probes_audio_artifact(settings, tmp_path: Path, monkeypatch) -> None:
+    container = build_container(settings)
+    output = tmp_path / "final.mp3"
+    output.write_bytes(b"audio-placeholder")
+
+    async def fake_probe(path: Path):
+        assert path == output
+        return {
+            "duration": 12.5,
+            "container": "mp3",
+            "video_streams": [],
+            "audio_streams": [{"codec": "mp3"}],
+            "resolution": None,
+        }
+
+    monkeypatch.setattr(container.processor.ffprobe, "probe", fake_probe)
+    report = await container.processor.validate_output_result(
+        OperationResult(path=output, filename=output.name, mime_type="audio/mpeg")
+    )
+
+    assert report["valid"] is True
+    assert report["probed"] is True
+    assert report["size_bytes"] == output.stat().st_size
+    assert report["audio_stream_count"] == 1
+    assert report["duration_seconds"] == 12.5
+
+
+@pytest.mark.asyncio
+async def test_output_validation_rejects_audio_without_audio_stream(settings, tmp_path: Path, monkeypatch) -> None:
+    container = build_container(settings)
+    output = tmp_path / "broken.mp3"
+    output.write_bytes(b"not-real-audio")
+
+    async def fake_probe(path: Path):
+        return {
+            "duration": 1.0,
+            "container": "mp3",
+            "video_streams": [],
+            "audio_streams": [],
+            "resolution": None,
+        }
+
+    monkeypatch.setattr(container.processor.ffprobe, "probe", fake_probe)
+    with pytest.raises(ProcessingError, match="no audio stream"):
+        await container.processor.validate_output_result(
+            OperationResult(path=output, filename=output.name, mime_type="audio/mpeg")
+        )
+
+
+@pytest.mark.asyncio
+async def test_output_validation_rejects_empty_artifact(settings, tmp_path: Path) -> None:
+    container = build_container(settings)
+    output = tmp_path / "empty.mp4"
+    output.write_bytes(b"")
+
+    with pytest.raises(ProcessingError, match="empty"):
+        await container.processor.validate_output_result(
+            OperationResult(path=output, filename=output.name, mime_type="video/mp4")
+        )