Update CLI and test response if cache save fails

circfirm/cli.py

@@ -167,4 +167,5 @@ def cache_save(board: str, version: str, language: str) -> None:
             args=(board, version, language),
         )
     except ConnectionError as err:
+        click.echo(" failed")  # Mark as failed
         raise click.exceptions.ClickException(err.args[0])

tests/test_cli.py

@@ -139,6 +139,7 @@ def test_cache_save() -> None:
     )
     assert result.exit_code == 1
     assert result.output == (
+        "Caching firmware version 7.3.0 for feather_m4_express... failed\n"
         "Error: Could not download spectified UF2 file:\n"
         "https://downloads.circuitpython.org/bin/feather_m4_express/"
         "nolanguage/"