Description
It should be possible for basic functions of the solr request dispatcher to be overridden e.g.
protected void execute(SolrQueryResponse rsp)
and
protected void sendError(int code, String message) throws IOException {
In Solr 5.2, SOLR-7484 broke this functionality and was fixed in 5.2.1 by SOLR-7623. We should add a test which asserts this feature so that it is not accidentally broken again in future.