Add cleanup and artifact test coverage

backend/tests/test_server.py

@@ -1,4 +1,5 @@
 from pathlib import Path
+import shutil
 import sys
 
 sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "src"))
@@ -11,6 +12,20 @@ import server
 client = TestClient(server.app)
 
 
+class FakeTemporaryDirectory:
+    def __init__(self, root: Path, prefix: str, created_paths: list[Path]) -> None:
+        self.path = root / f"{prefix}{len(created_paths)}"
+        self.created_paths = created_paths
+
+    def __enter__(self) -> str:
+        self.path.mkdir(parents=True, exist_ok=False)
+        self.created_paths.append(self.path)
+        return str(self.path)
+
+    def __exit__(self, exc_type, exc, tb) -> None:
+        shutil.rmtree(self.path, ignore_errors=True)
+
+
 def test_validate_output_format_rejects_unknown() -> None:
     try:
         server.validate_output_format("docx")
@@ -21,6 +36,13 @@ def test_validate_output_format_rejects_unknown() -> None:
 
 
 def test_transcriptions_returns_generated_artifact(monkeypatch, tmp_path: Path) -> None:
+    created_paths: list[Path] = []
+    monkeypatch.setattr(
+        server,
+        "TemporaryDirectory",
+        lambda prefix="": FakeTemporaryDirectory(tmp_path, prefix, created_paths),
+    )
+
     def fake_run(command: list[str], check: bool, capture_output: bool, text: bool):
         output_dir = Path(command[command.index("--output_dir") + 1])
         (output_dir / "clip.txt").write_text("hello world", encoding="utf-8")
@@ -43,9 +65,18 @@ def test_transcriptions_returns_generated_artifact(monkeypatch, tmp_path: Path)
     assert response.status_code == 200
     assert response.text == "hello world"
     assert response.headers["x-whisper-output-format"] == "txt"
+    assert created_paths
+    assert all(not path.exists() for path in created_paths)
 
 
-def test_transcriptions_maps_subprocess_failure(monkeypatch) -> None:
+def test_transcriptions_maps_subprocess_failure(monkeypatch, tmp_path: Path) -> None:
+    created_paths: list[Path] = []
+    monkeypatch.setattr(
+        server,
+        "TemporaryDirectory",
+        lambda prefix="": FakeTemporaryDirectory(tmp_path, prefix, created_paths),
+    )
+
     def fake_run(command: list[str], check: bool, capture_output: bool, text: bool):
         class Result:
             returncode = 1
@@ -64,3 +95,5 @@ def test_transcriptions_maps_subprocess_failure(monkeypatch) -> None:
 
     assert response.status_code == 502
     assert response.json()["detail"] == "bad whisper day"
+    assert created_paths
+    assert all(not path.exists() for path in created_paths)