-test_begin_subtest "signature verification with full user ID validity"
-# give the key ultimate owner trust, which confers full validity on
-# all user IDs in the certificate:
-echo "${FINGERPRINT}:6:" | gpg --no-tty --import-ownertrust >>"$GNUPGHOME"/trust.log 2>&1
-gpg --no-tty --check-trustdb >>"$GNUPGHOME"/trust.log 2>&1
+test_begin_subtest "signature verification without full user ID validity"
+# give the key no owner trust, removes validity on all user IDs of the
+# certificate in the absence of other trusted certifiers:
+gpg --quiet --batch --no-tty --export-ownertrust > "$GNUPGHOME/ownertrust.bak"
+echo "${FINGERPRINT}:3:" | gpg --quiet --batch --no-tty --import-ownertrust