Adds a assertFormError helper to the server configuration tests.
Adds a assertFormError helper to the server configuration tests.

micongrin/plugin_SolrSearch-WMI,scholarslab/SolrSearch,CATCH-FACT/SolrSearch-VB,scholarslab/SolrSearch,scholarslab/SolrSearch,CATCH-FACT/SolrSearch-VB,scholarslab/SolrSearch,CATCH-FACT/SolrSearch-VB,anuragji/SolrSearch,micongrin/plugin_SolrSearch-WMI,CATCH-FACT/SolrSearch-VB,anuragji/SolrSearch,micongrin/plugin_SolrSearch-WMI,anuragji/SolrSearch,anuragji/SolrSearch