Teacher should teach the course in question

src/main/java/nl/tudelft/ewi/queue/service/RequestService.java

@@ -148,7 +148,7 @@ public class RequestService {
      * @param request
      */
     public void approve(User assistant, Request request, String comment) {
-        if (!request.getAssistant().equals(assistant) && !(assistant.isTeacher() || assistant.isAdmin())) {
+        if (!request.getAssistant().equals(assistant) && !(assistant.teaches(request.getAssignment().getCourse()) || assistant.isAdmin())) {
             throw new IllegalArgumentException("You cannot approve a request that is not assigned to you.");
         }
         request.addEvent(new RequestApprovedEvent(request, assistant,LocalDateTime.now(), comment));
@@ -163,7 +163,7 @@ public class RequestService {
      * @param request
      */
     public void reject(User assistant, Request request, String comment) {
-        if (!request.getAssistant().equals(assistant) && !(assistant.isTeacher() || assistant.isAdmin())) {
+        if (!request.getAssistant().equals(assistant) && !(assistant.teaches(request.getAssignment().getCourse()) || assistant.isAdmin())) {
             throw new IllegalArgumentException("You cannot reject a request that is not assigned to you.");
         }
         request.addEvent(new RequestRejectedEvent(request, assistant,LocalDateTime.now(), comment));