### Question:
RunSingleSPARQL { public boolean removeSPARQLprefix(String label){ boolean ok = false; if(sparqlprefix.containsKey(label)){ sparqlprefix.remove(label); if(!sparqlprefix.containsKey(label)) ok = true; else ok = false; }else{ System.err.println("No prefix with name "+label); ok = false; } return ok; } RunSingleSPARQL(OWLOntology owl);  RunSingleSPARQL(OWLOntology owl, Map<String,String> prefix); Map<String,String> getSPARQLprefix(); boolean addSPARQLprefix(String label,String prefix); boolean removeSPARQLprefix(String label); QueryExecution createSPARQLQueryExecutionFactory(String query);  }### Answer:
@Test public void testRemoveSPARQLprefix() { Map<String,String> map = new HashMap<String,String>(); map.put("rdfs","<http: map.put("xsd","<http: map.put("owl","<http: map.put("rdf","<http: map.put("ex","<http: RunSingleSPARQL instance = new RunSingleSPARQL(owl,map); boolean result = instance.removeSPARQLprefix("ex"); if(result){ Map<String, String> mymap = instance.getSPARQLprefix(); assertEquals(false, mymap.containsKey("ex")); }else{ fail("Some errors occur in removeSPARQLprefix of KReSRunSPARQL."); } }