public class SolrSearchTest extends AbstractSolrTestCase {

 private SolrServer server;

 @Override
 public String getSchemaFile() {
    return "solr/conf/schema.xml";
 }

 @Override
 public String getSolrConfigFile() {
    return "solr/conf/solrconfig.xml";
 }

 @Before
 @Override
 public void setUp() throws Exception {
    super.setUp();
    server = new EmbeddedSolrServer(h.getCoreContainer(), h.getCore().getName());
 }

 public testFirstTry() {
    // e.g. add some docs via solrJ
    server.add(createDoc(entity1));
    server.add(createDoc(entity2));
    server.add(createDoc(entity3));
    server.add(createDoc(entity4));
    server.add(createDoc(entity5));

    // now query
    ArrayList myEntities = new ArrayList();
    SolrQuery query = new SolrQuery("text:peter").setQueryType("standard");
    QueryResponse rsp = server.query(query);
    SolrDocumentList docs = rsp.getResults();
    for (SolrDocument sd : docs) {
       myEntities.add(readDoc(sd));
    }

    assertEquals("peter", myEntities.get(0).getText());
    assertEquals(5, rsp.getResults().getNumFound());
 }
}

Another approach is documented here.