+ /**
+ * Gigi used to support plain SHA-1 password hashes, for compatibility with
+ * legacy software. Since there currently is only one accepted hash format,
+ * this test now verifies that plain SHA-1 hashes are no longer accepted nor
+ * migrated to more recent hash formats.
+ *
+ * @see PasswordHash.verifyHash
+ * @see PasswordHash.hash
+ * @throws IOException
+ */