Hi there please help me write test coverage code for given code

public class Project_Mentor {    Public static void mentors Status Available(list<Project_Mentor__c>projmentlist)  {       Set<id>Uniqueid =new Set<id>();   for(Project_Mentor__c Pm:projmentlist)       {           Uniqueid.add(Pm.Mentor__c );       }            list<Mentor__c> mntlist = [SELECT id,Name From Mentor__c WHERE id IN: Uniqueid];   //List<Project_mentor__c>pmlist=[SELECT id,Name FROM Project_mentor_c WHERE id iN : Uniqueid];   for(Mentor__c ment: mntlist)     {     for(Project_Mentor__c Pm:projmentlist)     {   if((Pm.Status__c=='Completed') && (Pm.Mentor__c==ment.id))                                   {           Ment.Status__c ='Available';       }     }         }  if(projmentlist.size() > 0)  {     try{         Update mntlist;        }     Catch(Exception EX){     System.debug(EX);     }    }  } }