Class:

public with sharing class TeamMemberAssignmentController {
 
  //private ApexPages.StandardController controller {get; set;}
     public List<AccountTeamMember> accs { get; set; }
      public string SelectedAccountTeamMemberId { get; set; }
       //used to get a hold of the account team member record selected for deletion
  public List<AccountTeamMember> searchResults {get;set;}
  public List<AccountTeamMember> ListDeleted {get;set;}
  public String searchText {get;set;}
  public List<cAccountTeamMember> AccountTeamMemberList {get; set;}
  // standard controller - could also just use custom controller
  public TeamMemberAssignmentController() { }
 
  // fired when the search button is clicked
  public PageReference search() {
    //String qry = 'select UserId,TeamMemberRole from AccountTeamMember where UserId IN (SELECT UserId FROM User WHERE Username="{!searchText}")';
    String qry = 'SELECT User.Name,Account.Name,TeamMemberRole,IsDeleted FROM AccountTeamMember ';
   // UserId = \''+accTeamMem.UserId+'\' OR AccountId = \''+accTeamMem.AccountId+'\'';
    qry = qry + getWhereClause();
    System.debug(qry);
    searchResults = Database.query(qry);
    return null;
  
  }
 
  // fired when the save records button is clicked
  //public PageReference save() {   
  public void save(){
   try
    {     
       if (accTeamMem == null) 
                      {     
                        accTeamMem = new AccountTeamMember();
                       }
      String accountID =  ApexPages.currentPage().getParameters().get('searchAccount');
      String UserID  =  ApexPages.currentPage().getParameters().get('searchName'); 
      String teamMemberRole = ApexPages.currentPage().getParameters().get('searchRole');
      system.debug('==accountID in controller=='+accountID);
       system.debug('==UserID in controller=='+UserID);
       system.debug('==teamMemberRole in controller=='+teamMemberRole);       
      insert accTeamMem;  
    }
     Catch (DMLException e) {
       ApexPages.addMessages(e);
       system.debug('====Check this exception too===='+e);        
        }  
         
        //return null;
     LoadData();
ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,'Your entry has been added'));

        }       
  // takes user back to main record
  public Pagereference RTSelector()

    {

        PageReference nextPage;

            nextPage = new PageReference('/apex/MassATM');

            nextPage.setRedirect(true);     return nextPage;

    }
 public Pagereference RTSelector1()

    {

        PageReference nextPage;

            nextPage = new PageReference('/apex/TeamAssignmenPage');

            nextPage.setRedirect(true);     return nextPage;

    }

 //public PageReference update1() {
public void update1(){
 
    try {
      update  searchResults ;
System.debug(searchResults);
    } Catch (DMLException e) {
      ApexPages.addMessages(e);
       //return null;

    }
   
     LoadData();
ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,'Your entry has been edited'));
         }

 public void delete1()
{
 integer i;
  for (i=0;i<searchResults.size();i++)
       {
          accTeamMem = searchResults.get(i);
          ListDeleted.add(accTeamMem);
           System.debug('Userid ='+accTeamMem.UserId);
            System.debug('IsDel ='+accTeamMem.IsDeleted);
               System.debug('AccounId ='+accTeamMem.AccountId);
       }
 delete ListDeleted;
}
//
 
 public AccountTeamMember accTeamMem
        {
            get
            {
                if (accTeamMem == null)
                {
                    accTeamMem = new AccountTeamMember();
                }
                return accTeamMem;
            }
            set;
        }  
       
 
  public String getWhereClause()
  {        
       String whereClause = 'IsDeleted=false';

       if (accTeamMem.UserId != null)
       {
         whereClause +='UserId = \''+accTeamMem.UserId+'\'';
       }
       if (accTeamMem.AccountId != null)
       {
         if (whereClause != '')
                        whereClause += ' and ';
         whereClause +='AccountId = \''+accTeamMem.AccountId+'\'';
       }
       if (accTeamMem.TeamMemberRole != null)
       {
         if (whereClause != '')
                        whereClause += ' and ';
         whereClause +='TeamMemberRole = \''+accTeamMem.TeamMemberRole+'\'';
       }
       if (whereClause != '')
       {
        whereClause = ' WHERE ' + whereClause;
       }
      
     return whereClause;

  }
//account TeamMember entry deletion method
 // private void LoadData() {
//System.debug('in loaddata ------2');
       //cs = [Select User.name, Account.name,TeamMemberRole from AccountTeamMember limit 20];
 //}
 private void LoadData() {
       searchResults= [Select User.name, Account.name,TeamMemberRole from AccountTeamMember limit 20];
   }

public void DeleteAccount()
   {
      // if for any reason we are missing the reference
      if (SelectedAccountTeamMemberId== null) {

         return;
      }

      // find the account record within the collection
      AccountTeamMember tobeDeleted = null;
      for(AccountTeamMember a : searchResults)
       if (a.Id == SelectedAccountTeamMemberId) {
          tobeDeleted = a;
          break;
       }

      //if account record found delete it
      if (tobeDeleted != null) {
       Delete tobeDeleted;
      }

      //refresh the data
      LoadData();
ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,'Your has been deleted'));
   }   

/////////////////////////////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////MASS DELETE FUNCTION/////////////////////////////////////
 public List<cAccountTeamMember> getAccountTeamMembers() { 

         if(AccountTeamMemberList == null) { 

             AccountTeamMemberList = new List<cAccountTeamMember>(); 

             for(AccountTeamMember c : [select User.Name,Account.Name,AccountTeamMember.TeamMemberRole  from AccountTeamMember limit 10]) { 

                 // As each contact is processed we create a new cContact object and add it to the contactList 
              AccountTeamMemberList.add(new cAccountTeamMember(c)); 

             } 

         } 

         return AccountTeamMemberList; 

     } 

public void processSelected() { 

                 //We create a new list of Contacts that we be populated only with Contacts if they are selected 

         List<AccountTeamMember> selectedAccountTeamMembers = new List<AccountTeamMember>(); 

         //We will cycle through our list of cContacts and will check to see if the selected property is set to true, if it is we add the Contact to the selectedContacts list 

         for(cAccountTeamMember cCon : getAccountTeamMembers()) { 

             if(cCon.selected == true) { 

                 selectedAccountTeamMembers.add(cCon.con); 

             } 

         } 

         // Now we have our list of selected contacts and can perform any type of logic we want, sending emails, updating a field on the Contact, etc 

         System.debug('These are the selected Contacts...'); 

         for(AccountTeamMember con : selectedAccountTeamMembers) { 

             system.debug(con); 
delete selectedAccountTeamMembers;
 

         } 

        LoadData();
ApexPages.addMessage(new ApexPages.message(ApexPages.severity.INFO,'Your entries have been deleted'));

     } 
public class cAccountTeamMember { 

         public AccountTeamMember con {get; set;} 

         public Boolean selected {get; set;} 

         //This is the contructor method. When we create a new cContact object we pass a Contact that is set to the con property. We also set the selected value to false 

         public cAccountTeamMember(AccountTeamMember c) { 

             con = c; 

            selected = false; 

         } 

    } 

  }

Test class is the same as suggested by you!!!