Given a temporary `gpg` home with primary and subordinate keys:
```
$ agent/gpg-agent --daemon --homedir $XDG_RUNTIME_DIR/gnupg-git
$ g10/gpg --homedir $XDG_RUNTIME_DIR/gnupg-git --batch --passphrase '' --quick-gen-key test
$ g10/gpg --homedir $XDG_RUNTIME_DIR/gnupg-git -K --with-subkey-fingerprint
```
Attempting to delete keys should result in:
1. The correct secret key fingerprints being printed in the confirmation prompts.
2. The deletion of every secret key being confirmed if the key specification is not exact.