@Test
    void lookup_search_chain() throws Exception {
        List<ResolveResult> searchChains = resolve(cluster1);
        assertEquals(1, searchChains.size());
        assertTrue(searchChainIds(searchChains).contains(cluster1));
    }
Test for SourceRefResolver.

@author Tony Vaagenes
container-search/src/test/java/com/yahoo/search/federation/sourceref/SourceRefResolverTestCase.java