public static String getDataSourceUnitVersionsNode(final String databaseName, final String dataSourceName) {
        return String.join("/", getDataSourceUnitsNode(databaseName), dataSourceName, VERSIONS);
    }
@Test
    void assertGetDataSourceUnitVersionsNode() {
        assertThat(DataSourceMetaDataNode.getDataSourceUnitVersionsNode("foo_db", "foo_ds"), is("/metadata/foo_db/data_sources/units/foo_ds/versions"));
    }