Hi i need help implementing the proper code for a JUnit test within my code for eclipse oxygen:

package medical.com.medicalApplication.model;

import static org.junit.Assert.*;

import java.util.ArrayList; import java.util.List;

import org.junit.Test;

import medical.com.medicalApplication.services.DoctorService;

public class DoctorService { private static DoctorService reference = new DoctorService(); private static List doctors; DoctorService(){ doctors = new ArrayList(); } @Test public static DoctorService getReference(){ return reference; } @Test public List getAllDoctors(){ return doctors; } @Test public boolean addDoctor(String name, String id){ String tempId = new String(id); boolean createDoctor = !doctors.stream().anyMatch(doctor -> doctor.getId() == tempId); if (createDoctor) { doctors.add(new Doctor(name, id)); } return createDoctor; }

}