public static String getDatabaseRuleVersionsNode(final String databaseName, final String ruleName, final String key) {
        return String.join("/", getDatabaseRuleNode(databaseName, ruleName), key, VERSIONS);
    }
@Test
    void assertGetDatabaseRuleVersionsNode() {
        assertThat(DatabaseRuleMetaDataNode.getDatabaseRuleVersionsNode("foo_db", "sharding", "foo_key"), is("/metadata/foo_db/rules/sharding/foo_key/versions"));
    }