Question

I am testing Java app with JUnit. The following is the source code of a specific method:

public class Surgery {
    Vector<Patient> patients;
    String name;

    public Surgery(String name) {
        patients = new Vector<Patient>();
        this.name = name;
    } 

     public Patient findPatient(String name) {
         Iterator<Patient> patientIt = patients.iterator();
         while(patientIt.hasNext()) {
             Patient next = patientIt.next();
             if (next.getName().equals(name))
                return next;
         }
         return null;
     }  

This is JUnit test method:

public class SurgeryTest {
    private Vector<Patient> vector;
    Surgery surgery_N =new Surgery("Teddy");
    ByteArrayOutputStream ans = new ByteArrayOutputStream();
    final String separator = System.getProperty("line.separator");

    @Test
    public void testFindPatient() {
        surgery_N.findPatient("Teddy");
    }
}

I need to test each statement in the source code method. I stuck, don’t know what else to do. Any solution?

Answer 1

Your Surgery class contains no way to add patients to it from the code sample you have given us, so your unit test should be finding nothing.

To test each statement in the source code method you should create multiple tests that cover each one of the possible paths in your code. That means, in your tests you will want to test for the scenario where you return a patient name if it exists, and one for where the patient doesn’t exist (returning null).

Here’s some example methods for you to work from:

public void testFindPatientWherePatientExists() {
    Patient thePatient = surgery.findPatient("Teddy");
    assertEquals("Teddy", thePatient.getName());
}

public void testFindPatientWherePatientDoesntExist() {
    assertNull(surgery.findPatient("I dont exist"));
}