@Test
    void testProcessingHandlerResolvesChains() {
        List<Chain<Processor>> chains = new ArrayList<>();
        chains.add(defaultChain);
        chains.add(simpleChain);
        driver = new ProcessingTestDriver(chains);

        assertEquals(simpleChainResponse, driver.sendRequest("http://localhost/?chain=simple").readAll());
        assertEquals(defaultChainResponse, driver.sendRequest("http://localhost/?chain=default").readAll());
    }
Tests processing handler scenarios end to end.

@author bratseth
@author gjoranv
@author Tony Vaagenes
container-core/src/test/java/com/yahoo/processing/handler/ProcessingHandlerTestCase.java