我如何测试Solr SearchComponent-JUnit测试

Question

我需要为solr SearchComponent（SearchComponent.process（））编写单元测试。 我该怎么办？我可以使用SolrTestCaseJ4还是其他方式？ 我目前正在使用SolrTestCaseJ4 ...

我目前正在使用SolrTestCaseJ4 ...

public class SearchComponentTest extends SolrTestCaseJ4 {
     @BeforeClass
     public static void beforeClass() throws Exception {
         initCore("collection1/conf/solrconfig.xml", "collection1/conf/schema.xml", "src/test/resources/");
     }

     @Test
     public void testPrepare() throws IOException {
         MySearchComponent component = new MySearchComponent();
         List<SearchComponent> components = new ArrayList<>();
         components.add(component);
         SolrQueryRequest req;
         ResponseBuilder rb;
         req = req("q", "*:*");
         rb = new ResponseBuilder(req, new SolrQueryResponse(), components);
         component.process(rb);
     }
}

和我的SearchComponent：

public class MySearchComponent extends SearchComponent {
     public void process(ResponseBuilder rb) throws IOException {
      ....
        SolrQueryRequest req = rb.req;
        SolrQueryResponse rsp = rb.rsp;
        SolrParams params = rb.req.getParams();

        SchemaField keyField = rb.req.getCore().getLatestSchema().getUniqueKeyField();
        String core = rb.req.getCore().getName();

        SolrIndexSearcher searcher = req.getSearcher();
        QueryCommand cmd = rb.createQueryCommand();
        QueryResult result = new QueryResult();

        searcher.search(result, cmd);
        rb.setResult(result);

        BasicResultContext ctx = new BasicResultContext(rb, rb.getResults().docList);
        rsp.add("response", ctx);
        ...
     }
...
}

但是我在这条线上有NullPointerException： QueryCommand cmd = rb.createQueryCommand（）;

谢谢您的帮助！