cli: surface HTTP status and body on backend errors

cli/tests/test_main.py

@@ -8,6 +8,7 @@ import pytest
 sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "src"))
 
 import main
+import httpx
 
 
 def test_resolve_server_from_env(monkeypatch) -> None:
@@ -29,3 +30,17 @@ def test_infer_output_path_for_directory(tmp_path: Path) -> None:
 def test_infer_output_path_for_explicit_file(tmp_path: Path) -> None:
     destination = main.infer_output_path(tmp_path / "custom-name.txt", Path("clip.wav"), "txt")
     assert destination == tmp_path / "custom-name.txt"
+
+
+def test_format_http_error_with_body() -> None:
+    request = httpx.Request("POST", "http://localhost:8000/transcriptions")
+    response = httpx.Response(500, text="Internal Server Error", request=request)
+    message = main.format_http_error(response, "http://localhost:8000/transcriptions")
+    assert message == "HTTP 500 from http://localhost:8000/transcriptions: Internal Server Error"
+
+
+def test_format_http_error_with_empty_body() -> None:
+    request = httpx.Request("POST", "http://localhost:8000/transcriptions")
+    response = httpx.Response(500, text="", request=request)
+    message = main.format_http_error(response, "http://localhost:8000/transcriptions")
+    assert message == "HTTP 500 from http://localhost:8000/transcriptions: <empty response body>"