public Collection<String> getRelatedShadowTables(final Collection<String> tableNames) {
        Collection<String> result = new LinkedList<>();
        for (String each : tableNames) {
            if (shadowTableRules.containsKey(each)) {
                result.add(each);
            }
        }
        return result;
    }
@Test
    void assertGetRelatedShadowTables() {
        Collection<String> relatedShadowTables = shadowRule.getRelatedShadowTables(Arrays.asList("t_user", "t_auto"));
        assertThat(relatedShadowTables.size(), is(1));
        assertThat(relatedShadowTables.iterator().next(), is("t_user"));
    }