public Optional<ReadwriteSplittingDataSourceGroupRule> findDataSourceGroupRule(final String dataSourceName) {
        return Optional.ofNullable(dataSourceRuleGroups.get(dataSourceName));
    }
@Test
    void assertFindDataSourceGroupRule() {
        Optional<ReadwriteSplittingDataSourceGroupRule> actual = createReadwriteSplittingRule().findDataSourceGroupRule("readwrite");
        assertTrue(actual.isPresent());
        assertDataSourceGroupRule(actual.get());
    }