Handle CLI request errors and backend whisper timeout

backend/tests/test_server.py

@@ -64,3 +64,22 @@ def test_transcriptions_maps_subprocess_failure(monkeypatch) -> None:
 
     assert response.status_code == 502
     assert response.json()["detail"] == "bad whisper day"
+
+
+def test_transcriptions_maps_subprocess_timeout(monkeypatch) -> None:
+    def fake_run(command: list[str], check: bool, capture_output: bool, text: bool, timeout: int):
+        raise server.subprocess.TimeoutExpired(cmd=command, timeout=timeout)
+
+    monkeypatch.setattr(server.subprocess, "run", fake_run)
+
+    response = client.post(
+        "/transcriptions",
+        data={"model": "base", "output_format": "txt"},
+        files={"file": ("clip.wav", b"audio", "audio/wav")},
+    )
+
+    assert response.status_code == 504
+    assert (
+        response.json()["detail"]
+        == f"Whisper CLI timed out after {server.WHISPER_PROCESS_TIMEOUT_SECONDS}s and was terminated."
+    )